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TOA ElectronicsSpeaker Guide
TOA Electronics Speaker Guide
Table of Contents
List of Figures
..................................................................................................................... viii
Chapter 1: Getting Started: System Design Steps
Chapter 2: System Applications
Paging .................................................................................................................12
Speech Reinforcement ........................................................................................12
Background Music ..............................................................................................13
Foreground Music...............................................................................................13
Voice/Music Combinations ................................................................................13
Presentation Audio..............................................................................................13
Chapter 3: Speaker Types
Ceiling Speakers .................................................................................................14
Wall-mount Speakers..........................................................................................14
............................................................................................14
...............................................................................12
.........................................10
In-wall Speakers..................................................................................................15
Paging Horns.......................................................................................................15
Subwoofers .........................................................................................................16
Chapter 4: Audio Basics
The Decibel .........................................................................................................17
Sound Pressure Level.................................................................................17
Power, Volume, and Decibels....................................................................17
Sensitivity Ratings and the Decibel ...........................................................18
Attenuation over Distance: Inverse Square Law .......................................18
Speech Intelligibility, Acoustics, and Psychoacoustics ......................................18
Masking, Upward Masking, and the Haas Effect ......................................19
Reverberation.............................................................................................19
Equalization ........................................................................................................20
...............................................................................................17
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TOA Electronics Speaker Guide
Chapter 5: Using Speaker Specifications
...........................................................21
Determining Maximum Output: Sensitivity and Power Handling .....................21
Coverage Angle ..................................................................................................23
Frequency Response ...........................................................................................23
Chapter 6: Layout and Spacing for Distributed Speaker Systems
Ceiling Speakers .................................................................................................24
Speaker Coverage Area .............................................................................24
Coverage Area and Ceiling Height............................................................25
Coverage Density vs. Budget.....................................................................25
Layout Patterns ..........................................................................................26
Wall-Mount Speakers .........................................................................................28
Speaker Coverage Area .............................................................................28
Speaker Spacing and Layout Pattern .........................................................29
Subwoofers .........................................................................................................29
.......24
Chapter 7: Amplifier Selection
Direct Connection or Constant Voltage..............................................................30
Power Requirements ..................................................................................30
Subwoofer Power Requirements ...............................................................31
Examples.............................................................................................................31
High-Quality Paging System .....................................................................31
Outdoor Paging System .............................................................................32
High-Quality Multi-Purpose System .........................................................33
..................................................................................30
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TOA Electronics Speaker Guide
Chapter 8: Speaker Application Tables
How to Use This Section ....................................................................................34
All Speakers...............................................................................................34
Ceiling Speakers ........................................................................................34
Wall-mount Speakers.................................................................................35
Ceiling-mount Speakers......................................................................................36
F-101C/M...................................................................................................36
F-121C/M...................................................................................................37
PC-671R/RV..............................................................................................38
H-1 .............................................................................................................39
H-2/WP ......................................................................................................41
Wall-mount Speakers..........................................................................................42
BS-1030B/W..............................................................................................42
BS-20W/WHT ...........................................................................................43
CS-64, CS-154, CS-304.............................................................................44
................................................................34
F-160G/W, F-240G/W...............................................................................47
F-505G/W, F-605G/W...............................................................................49
H-3/WP ......................................................................................................51
Paging Horns.......................................................................................................52
SC-610/T, SC-615/T, SC-630/T, SC-650..................................................52
Appendix A:Wire Size Charts
.................................................................................... A-1
Appendix B: Speaker Mounting Hardware and Accessory Reference
A-2
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TOA Electronics Speaker Guide
List of Figures
3-1 F-101C/M, F-121C/M ceiling speakers .............................................................................14
3-2 BS-1030B/W wall-mount speaker .....................................................................................14
3-3 H-1 in-wall speaker............................................................................................................15
3-4 SC Series paging horns ......................................................................................................15
3-5 FB-100 subwoofer (left) and HB-1 in-wall subwoofer .....................................................16
5-1 Level change with distance................................................................................................22
5-2 Level change with power ...................................................................................................22
6-1 Ceiling speaker coverage area ...........................................................................................25
6-2 Speaker coverage with no overlap: hexagonal (left), square (right) ..................................26
6-3 Speaker coverage with minimum overlap: hexagonal (left), square (right) ......................26
6-4 Speaker coverage with edge-to-center overlap: hexagonal (left), square (right)...............27
6-5 Wall-mount speaker coverage area....................................................................................28
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TOA Electronics Speaker Guide
Welcome to the TOA Speaker Guide
TOA has long been recognized as a manufacturer of high-quality, flexible, and reliable amplifiers.
For over 75 years, we have also been an innovator in the design of high-performance speaker
systems for a wide range of applications. TOA has been at the forefront in the development of
specialized loudspeaker technologies for public spaces. TOA produced some of the first professional speaker systems that utilized dedicated electronic processing to optimize the speaker’s performance. TOA engineers presented the first AES papers on adaptive filter equalization
and the use of all-pass filters for flat-phase speaker tuning. Our test facilities include one of the
world’s largest anechoic chambers and state-of-the-art facilities for acoustics and reverberation
simulation. TOA was among the first to adopt the RASTI speaker intelligibility rating method
and we rigorously test our speakers using TEF 20 analyzers. TOA also assisted with the Japanese
translation of the classic text by Don and Carolyn Davis, Sound System Engineering, and has long
been a sponsor of Syn-Aud-Con sound system design seminars.
The purpose of this design guide is to provide sound contractors and systems integrators with
a convenient, easy-to-use reference to design small- and medium-sized TOA distributed speaker systems. The guide discusses the main parameters and trade-offs involved in designing distributed speaker systems and provides rules-of-thumb to help specify and implement them.
Disclaimer: This design guide does not cover all of the general concepts underlying sound
system design and installation, which would require several hundred pages. This guide is not
meant to replace the participation of an experienced consultant or engineer.
References: For more detailed information about sound system design principles, we recommend
the following two excellent books:
Sound System Engineering, Second Edition, Don and Carolyn Davis, 1975, 1987 by Howard Sams &
Co. ISBN: 0-672-21857-7
Handbook for Sound Engineers: Third Edition, Glen Ballou, Editor, 2001, Butterworth and Heinemann.
ISBN: 0-240-80454-6
Acknowledgements
Thanks to Steve Mate and John Murray in the TOA Product Support Group for their invaluable
support and contributions to this project. Thanks also to Don and Carolyn Davis for being guiding
lights to so many of us who work with sound and who always want the world to sound a little
(sometimes a lot) better.
David Menasco
Product Application Specialist
TOA Electronics, Inc.
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TOA Electronics Speaker Guide
Chapter 1: Getting Started: System Design
Steps
System design is essentially a process of answering the right questions in the right order. Answering the following questions will provide the basis of a sound design for your system. Not
included in the list is the question of project budget, which is always a guiding factor.
1. Where will the system be used?
Is it indoors or outdoors?
If indoors, is it highly reverberant?
How large is the space?
What mounting/installation options are available?
Answers to the following questions will guide the project and influence subsequent questions.
2. What will the system be used for?
Is it for music, speech, signaling tones, or a combination?
What level of fidelity, or sound quality, is required?
Is strong bass response important?
What level of speech intelligibility is required?
Defining the requirements of the system is critical to the success of the installation. Different sound
system applications and their requirements are discussed in Chapter 2: System Applications.
3. How loud must the system be?
How much noise is present in the listening environment?
Will the system be used for high-level foreground music?
Use an SPL meter to measure ambient noise levels on site during typical operating conditions.
An inexpensive SPL meter is available from Extech (http://www.extech.com). See Chapter 5:
Using Speaker Specifications for an overview of how to calculate the required sound pressure
and power levels, based on the background noise you measured or estimated.
4. What type of speakers are right for the job?
Will the job require ceiling, wall-mount, or other types of speakers?
Will subwoofers be needed to enhance the bass response?
Since the best speakers for one job may be amongst the worst for another job, proper matching
of the speaker to the installation is important. See Chapter 3: Speaker Types for a discussion of
the types of speakers most commonly used in distributed speaker systems, and the application
each is suited for.
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TOA Electronics Speaker Guide
5. How should the speakers be distributed throughout the space?
What layout pattern will be used (i.e., square or hexagonal)?
How far should speakers be spaced from each other?
It is often said that “location is everything.” Where speakers are concerned, this is often the
case. See Chapter 2: System Applications and Chapter 6: Layout and Spacing for Distributed
Speaker Systems for rules-of-thumb to establish the appropriate number and placement of
speakers.
6. How much power and what kind of wiring is required?
An amplifier with inadequate power can render a sound system unintelligible at normal operating
levels. Matching the amp(s) to the speaker(s)—and selecting the proper connecting cable—
are important ingredients of speaker system design. See Chapter 7: Amplifier Selection and
Appendix A: Wire Size Charts for this critical information.
7. Is equalization required?
In many cases, an equalizer can help balance the sound of a system. When microphones are
used, equalization may also improve gain before feedback. See page 20 for a brief discussion
of how equalizers function in distributed sound systems.
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TOA Electronics Speaker Guide
Chapter 2: System Applications
Paging
Paging systems communicate voice announcements throughout a building or area. Distributing
intelligible speech is the main requirement of a paging system. Consider the following points
when designing a system for paging:
• Speech energy is concentrated in the range 350 Hz – 5 kHz. System frequency response
should be smooth and consistent in this range.
• Speech intelligibility is most affected by system performance in the range 1–5 kHz.
Consistent coverage of the listening area is especially important in this frequency
range.
• People’s voices can vary significantly in loudness, sometimes leading to high peak
(short-term) demands on system power. Excessive distortion (due to overdriven amplifiers or speakers) can reduce intelligibility by masking the critical consonant sounds.
See Sensitivity Ratings and the Decibel on page 18, Determining Maximum Output:
Sensitivity and Power Handling on page 21, and Chapter 7: Amplifier Selection to
match your speakers and amplifiers to the application.
Additional intelligibility factors are discussed in Chapter 4: Audio Basics.
Speech Reinforcement
Sound systems that must amplify speech for extended periods of time (i.e., a meeting room or
a lecture hall) pose special challenges to the system designer. Consider the following points
when designing a speech reinforcement speaker system:
• It is important to avoid dead spots (quiet or dull-sounding areas within the listening
area) to maximize intelligibility and avoid feedback. Feedback occurs when the gain
is increased in an attempt to supply more volume to the dead areas.
• Using multiple mics to reinforce multiple speakers, as in a panel discussion, presents
a special challenge: Doubling the number of microphones reduces the system gain (relative volume) that can be reached before feedback by 3 dB.
• If more than four microphones are used, consider employing an automatic mixer, such
as the TOA AX-1000A, to help maximize system gain.
• The gain, or relative volume, that can be achieved depends on the relative positions of
the microphones, the loudspeakers, and the listeners, in combination with the acoustical
characteristics of the mics, loudspeakers, and room. Sound System Engineering is an
excellent reference for maximizing system gain (see page 9 for reference).
12
TOA Electronics Speaker Guide System Applications
Background Music
Background music places different demands on a sound system than paging. Consider the following points when designing a background music system:
• Natural-sounding music reproduction requires a minimum frequency response range
of 100 Hz – 10 kHz that is wider than the basic speech range.
• Background music sources typically have limited dynamic range, and have a lower
peak volume requirement than foreground music or paging.
• Background music does not usually require the precise spectral balance and consistency of
coverage as speech; this allows wider speaker spacing in background music-only systems.
Foreground Music
Foreground music plays a more prominent role in the space’s primary function (i.e., music in
a bar or fitness center) than background music and is generally louder and more dynamic. The
special demands of foreground music include the following:
• At higher levels, the quality of the sound system is more noticeable. The frequency response range should be wider and distortion levels lower than a typical background
music system.
• Depending on the application and client taste, the bass response should extend down
to 60 Hz or lower, high frequency response to 16 kHz or higher.
• One or more subwoofers may be needed to provide additional bass output.
• The amplifier power and the sensitivity and power handling ratings of the speakers must
be adequate to reproduce the music’s peaks without distortion. This could mean using
five or even ten times more power than is used in a typical background music system.
See Power, Volume, and Decibels on page 17 for an overview of the relevant factors.
Voice/Music Combinations
Most installed sound systems are required to reproduce both speech and music. Therefore, they
must have both the smooth response and even coverage of a speech system and the wide frequency
range and continuous output capability of a music system. In a distributed speaker design,
this means using good quality speakers and relatively close spacing.
Presentation Audio
Sound for video and audio-visual presentations should be treated as a combination speech and
foreground music application. To reproduce sound effects (i.e., movie sound or attentiongetting AV presentations), amplifier power and speaker power handling should be adequate to
handle the highest program peaks.
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TOA Electronics Speaker Guide
Chapter 3: Speaker Types
There are four speaker types for distributed systems: ceiling, wall-mount, in-wall, and paging
horns. Subwoofers are also used in some systems to augment the bass. The following sections
discuss the characteristics and best uses for each type.
Ceiling Speakers
Figure 3-1 F-101C/M, F-121C/M ceiling speakers
Ceiling speakers distribute sound unobtrusively from a relatively low ceiling over a large floor
area. When installed with the proper spacing and sufficient amplifier power, a good quality
ceiling speaker provides uniform coverage and satisfactory frequency response for live speech
reinforcement and background music applications.
Wall-mount Speakers
Figure 3-2 BS-1030B/W wall-mount speaker
Wall-mount speakers, which are generally full-range, multi-way systems, are often well suited
for foreground music. They are also applicable if the ceiling is very high or is otherwise not
suitable for mounting speakers. Speakers may be mounted directly to the wall’s surface (i.e.,
TOA’s H series), or with a swivel bracket (F- and BS- series).
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TOA Electronics Speaker Guide Speaker Types
In-wall Speakers
Figure 3-3 H-1 in-wall speaker
Installing the speaker inside a wall is unobtrusive and deters theft. However, installation can be
costly and proper aiming and positioning are often problematic. The TOA H-1 in-wall speaker
overcomes this obstacle by using rotating speaker elements to aim sound where it is needed.
Proper spacing is important, especially for speech intelligibility.
Paging Horns
Figure 3-4 SC Series paging horns
Paging horns can achieve a higher SPL than ceiling or wall speakers, but have limited frequency
response, lower sound quality, and higher distortion levels. They are seldom used for music applications but are commonly used outdoors where long sound projection distances are needed.
They are also used in noisy environments where high sound levels are required for intelligible
messages (i.e., large public spaces, warehouses, and factories). When properly aimed and installed, their controlled coverage and reduced low frequency output increases the direct sound
level and reduces low-frequency masking, which are significant advantages in large rooms. The
TOA SC Series wide-range paging horns offer a compromise between high output levels and
sound quality that is preferred for outdoor music applications.
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TOA Electronics Speaker Guide Speaker Types
Subwoofers
Figure 3-5 FB-100 subwoofer (left) and HB-1 in-wall subwoofer
Distributed music systems are often faced with the challenges of delivering clear, high-fidelity
sound with enough power to overcome high ambient noise levels at an affordable price. Meeting these requirements has typically involved giving up good bass response because small
speakers cannot reproduce low frequencies at high levels. Since many contemporary musical
styles require powerful bass reproduction, adding a subwoofer is a cost-effective way to meet
this new demand.
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TOA Electronics Speaker Guide
Chapter 4: Audio Basics
The Decibel
The Bel, named in honor of Alexander Graham Bell, was originally defined as the loss of signal
level over one mile of telephone cable. A decibel is 1/10th of a Bel. Neither the Bel nor decibel
have an explicit level, but are specified as a logarithmic ratio.
Sound Pressure Level
Sound Pressure Level (SPL) is the acoustic pressure reference for the dB. The minimum
threshold of undamaged human hearing is considered to be 0 dB SPL. The threshold of pain
for undamaged human hearing is 120 dB SPL.
Power, Volume, and Decibels
Since the decibel is an expression of relative level change, it can be used to describe volume
levels in both the acoustical and electrical domains. 80 dB SPL refers to an acoustic volume
(loudness) level relative to the standard 0 dB reference. Changes in electrical power and voltage
can also be described in terms of the dB (see Sound System Engineering by Don and Carolyn
Davis for an in-depth discussion on the use of the decibel in sound system design). The following
rules of thumb will help properly utilize the decibel in speaker system design:
• A change of 2 dB SPL in overall volume is the smallest change perceptible to the
average listener.
• Increasing the volume by 3 dB requires doubling the amplifier power.
• Multiplying amplifier power by a factor of 10 increases SPL by 10 dB.
• Increasing the level by 10 dB SPL is perceived by a typical listener as doubling the volume.
• Voltage is not the same as power. Doubling voltage increases volume by 6 dB and multiplying voltage by 10 increases volume by 20 dB.
For the mathematically minded: The following equation converts power differences to volume
changes: level change in dB = 10 * log (P1/P2), where P1 and P2 are the power figures being
compared in Watts.
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TOA Electronics Speaker Guide Audio Basics
Sensitivity Ratings and the Decibel
A speaker’s sensitivity is the on-axis loudness (dB SPL) measured at a specific distance that
results from applying a specific amount of power (i.e., 1 W @ 1 m). The output level of the
speaker at different power levels and distances can be calculated from this figure. For example:
If a speaker’s sensitivity is rated at 96 dB SPL with a 1 W input measured at 1 m from the
speaker, then doubling the power to 2 W raises the output 3 dB to 99 dB SPL at 1 m. Doubling
the power again to 4 W produces 102 dB SPL. For a discussion and examples of how to use
sensitivity ratings, see Chapter 5: Using Speaker Specifications.
Attenuation over Distance: Inverse Square Law
The inverse square law describes how sound attenuates over distance. It states that volume
(SPL) decreases 6 dB each time the distance from the sound source is doubled. This is due to
the diffusion of sound radiating from the sound source over a spherical area. As the radius of a
sphere is doubled, its surface area quadruples, effectively dividing the acoustical power by
four. This is consistent with the discussion above of power, volume, and the decibel: dividing
the power by 2 results in a 3 dB decrease in volume; dividing by 4 results in a 6 dB decrease.
For the mathematically minded: The following equation converts a change in distance to a
change in level for a spherically radiating source: level change in dB = 20 * log (D1/D2), where
D1 is the original distance and D2 is the new distance.
Speech Intelligibility, Acoustics, and Psychoacoustics
Speech intelligibility refers to the degree a listener can understand spoken words in a particular
space. It is important to clearly hear and differentiate consonant sounds. The two basic parameters
affecting intelligibility are the smoothness of the system frequency response curve in the
speech range (about 350 Hz – 5 kHz) and the effective signal-to-noise ratio of the system (noise
can include echoes, reverberation, distortion, and even out-of-band signals such as excessive
bass). Good frequency response depends on selecting high-quality speaker components and
locating and aiming them correctly. The following sections on masking effects and reverberation
cover some often overlooked factors that affect achieving a good signal-to-noise ratio.
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TOA Electronics Speaker Guide Audio Basics
Masking, Upward Masking, and the Haas Effect
Masking refers to one sound being obscured by another so it is unnoticed or indistinguishable
from the first sound. It is one of the main obstacles to speech intelligibility. Typical sound systems
include a number of potential sources of masking effects.
Background noise is the most obvious: the sound system’s normal operating level should be at
least 15–25 dB above the background noise level.
High distortion levels in amplifiers, speakers, or other sound system components, is another
possible source of masking. Excessive distortion is easily avoided by using high-quality
equipment and following industry guidelines for proper gain structure. For a definitive discussion of sound system gain structure, see Sound System Engineering.
Late reflections, or late-arriving sounds from distant speakers, can be especially troublesome
and can ruin both music quality and intelligibility. Good speaker layout avoids echoes from distant speakers. It is also important to properly place and aim speakers to avoid echoes from distant walls or other surfaces.
The Haas Effect refers to a characteristic of human hearing that perceives early reflections (i.e.,
from surfaces near the sound source or listener) as part of the original sound, while later reflections from more distant surfaces are perceived as discreet echoes. This characteristic can be
used to advantage in room and sound system design, but can also indicate conditions to avoid.
As a general rule, avoid strong reflections from surfaces more than 15 ft from either the sound
source or the listener. Field experience indicates that reflections from surfaces 7–10 ft from the
source or listener blend more smoothly with the direct sound. Very close reflections, within 4 ft
of the source or listener, cause audibly wide notches in frequency response due to phase cancellation and should be avoided or moderated using acoustically absorbent materials.
Upward masking refers to the characteristic of a sound to mask not only other sounds in the
same frequency range, but also sounds several octaves higher. This often overlooked aspect of
human hearing can result in a loss of intelligibility when the lower frequencies predominate in
a sound system—a common occurrence, especially with speakers with dispersion patterns that
get narrower with increasing frequency. For example, an eight-inch ceiling speaker is omnidirectional below 400 Hz, but has less than 60° coverage above 2 kHz, resulting in excessive
reflected and off-axis sound energy in the low frequencies.
Reverberation
Reverberation is another common source of masking-related intelligibility loss. Significant
reverberation occurs in a large room (i.e., church, gymnasium, or auditorium) where repeated
reflections merge into a seemingly continuous sound with a gradual rate of decay. Many installed sound systems are used in spaces where there is little or no significant reverberation. This
design guide is applicable in these situations. When designing a speech reinforcement system
for a large, reverberant room (RT60 > 2.5 s), we recommend consulting with a specialist in acoustical system design. More information on sound system designs for large rooms can be found
in Sound System Engineering, and in Handbook for Sound Engineers.
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TOA Electronics Speaker Guide Audio Basics
Equalization
Equalization, or EQ, is the process by which the amplitude of discrete frequency ranges is adjusted.
In distributed systems, EQ is most often used to compensate for speaker and room characteristics
but can also be used for aesthetic enhancement. Whether and how much equalization to use
depends on the performance standard and how the selected equipment performs in the acoustical space. Many applications do not require equalization. The benefits of using equalization
include improved speech intelligibility, enhanced sound quality due to a better spectral balance,
and increased gain without feedback. It is important to note that there is the potential for serious
problems if the equalizer is set by an unqualified operator or mistakenly reset (i.e., someone
cleans the unit and moves the faders). Security covers or dedicated preset equalizers can prevent
these problems.
TOA offers a range of equalizer modules for our 900 series amplifiers that are optimized for
specific H and F Series speakers. These cost-effective modules are preset and therefore tamperproof. For larger sound systems, TOA also makes 1/3-octave and dual, 2/3-octave rack-mount
equalizers, as well as a full-featured digital signal processing system that provides simultaneous equalization, delay, crossover, matrixing, and dynamics processing functions. For a
more detailed discussion of the use of equalizers, see Sound System Engineering (see page 9
for complete reference).
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TOA Electronics Speaker Guide
Chapter 5: Using Speaker Specifications
Determining Maximum Output: Sensitivity and Power
Handling
A thorough system design must establish the maximum SPL required from each speaker at a
given listening position. In general, a speaker should be able to produce a sustained longterm average level 15–25 dB higher than the background noise in its area. If the noise level
is less than 45 dB SPL, the speaker should be able to produce a long-term average level of
70 dB SPL in the listening area, with undistorted peaks 10–20 dB higher. As noted on page 18,
a speaker’s rated sensitivity is the on-axis loudness (dB SPL) measured at a specific distance
that results from applying a specific amount of power (i.e., 1 W @ 1 m). The sensitivity may
be used to calculate loudness at other distances and power levels. Three specifications are required to calculate the maximum SPL capability of a speaker in its environment:
• The speaker/transformer’s maximum continuous power rating, or the available
amplifier power;
• The speaker’s sensitivity rating (dB SPL @ 1 m on-axis with 1 W input);
• The distance between the listener and the speaker.
Using these three specifications, the maximum on-axis output can be calculated (the formulas
for decibels gained with power and decibels lost with distance are presented in Chapter 4:
Audio Basics). Since the formulas use the log function and require a scientific calculator,
simplified charts (Figure 5-1 and Figure 5-2) are included here for convenience.
Example: A paging horn in an outdoor area needs to reach an average level of 90 dB SPL at
80 ft from the horn. A 30 W model is selected with a sensitivity of 112 dB, 1 W @
1 m. To allow for short-term transients, 6 dB of headroom is added to the average
level requirement, yielding a target level of 96 dB SPL.
Question: How much power is needed to reach the target level?
The rated sensitivity is 112 dB SPL, with 1 W @ 1 m. Use the chart for level change with
distance (Figure 5-1) to see how much the level is reduced at 80 ft compared to the reference distance of 1 m (answer: 27.7 dB, or about 28 dB). This tells us that 1 W sensitivity at 80 ft is 112 – 28 = 84 dB SPL. This is 12 dB less than the target level of 96 dB. Use
the chart for level change with power (Figure 5-2) to find the power required to increase
the level 12 dB (answer: about 16 W).
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TOA Electronics Speaker Guide Using Speaker Specifications
Question: What is the maximum long-term average output capability of the speaker at 80 ft?
The rated long-term average power handling is 30 W. Use the chart for level change with
power input (Figure 5-2) to find that our maximum output with 30 W at the reference distance
of 1 m is approximately 127 dB SPL (112 + 15 dB). Use the chart for level change with
distance (Figure 5-1) to see that at 80 ft, our maximum output will be approximately 99 dB
SPL (127 – 28 dB). This gives 9 dB of headroom above the target level.
Distance
3.82 ft.
1 m
1
0
2345
Attenuation (dB)
Decibels (dB)
1
0
1
2345
2
Watts (W)
2 m
6
6
4
10 ft.
4 m
9
Figure 5-1 Level change with distance
9
8
12
12
16 32
10 W
(10 dB)
20 ft.
8 m
15 18
15 18
64
100 W
(20 dB)
40 ft.
16 m 32 m
21
21
24
24
128 256
80 ft.
27
27
512
30
30
1024
Figure 5-2 Level change with power
22
TOA Electronics Speaker Guide Using Speaker Specifications
Coverage Angle
The coverage angle of a speaker is the angle within which the SPL is no more than 6 dB below
the normalized on-axis level for a given bandwidth or frequency center. The desired coverage
angle for a speaker depends on its role in the system, the number and spacing of speakers, and
the acoustical environment. Typically, distributed speaker systems and background music systems
need medium to wide dispersion speakers (coverage angle ≥ 60°). If the speakers are close to
the listeners, for example in a low-ceiling room or pew-back speakers in a church, then wide
dispersion is especially desirable (coverage angle ≥ 100°). Nominal coverage angle ratings of
TOA speaker models are listed in Chapter 8: Speaker Application Tables. Polar plots depicting
the coverage angle at standard frequency bands are found on our speaker specification sheets,
which may be downloaded at www.toaelectronics.com.
Frequency Response
Frequency response refers to the frequency range over which the speaker responds, usually with
a tolerance range for level variation. For example, a frequency response rating of 35 Hz – 18 kHz
±3 dB is typical of a professional studio monitor. The rating means that with constant input at
all frequencies, the output over the stated frequency range will fall within a 6 dB window (3 dB
above and below 0 dB) of variation. In general, a wider frequency response range indicates
higher fidelity sound reproduction. However, restricting the frequency range (i.e., switching on
the low-cut filter) can be an advantage in installed sound systems in order to:
• Avoid upward masking of consonants by low frequency energy, especially in reverberant
spaces.
• Increase system headroom and avoid distortion at high levels.
• Maximize the overall system performance/cost ratio.
The following approximate frequency response guidelines are for specific applications and
environments:
• Speech-only paging system (with or without emergency signaling) for a noisy environment: 350 Hz – 5 kHz
• Speech-only indoor environment: 120 Hz – 10 kHz
• Low-level background music: 100 Hz – 10 kHz
• Foreground music, high-quality background music and audio-visual applications: 80 Hz
or lower – 16 kHz or higher. Achieving the desired low-frequency response may require
a subwoofer in addition to high-quality main speakers.
23
TOA Electronics Speaker Guide
Chapter 6: Layout and Spacing for Distributed
Speaker Systems
Many installed speaker systems use a distributed sound design, which means that there are
evenly spaced speakers spread throughout the venue, each covering a specific area. These
speakers may be mounted in the ceiling, in or on the walls, or on columns or poles or other
available structures. There are a number of possible approaches in laying out the speakers, or
determining their placement in the room. Of course, the type of installation (ceiling, wall, etc.)
must be known before deciding on a layout pattern.
Ceiling Speakers
Two key decisions guide the placement, or layout, of speakers in a ceiling speaker system:
• Speaker spacing;
• Layout pattern type (square or hexagonal).
The most important factors to consider when making these decisions are the speaker coverage
area, the evenness of coverage desired, and the client’s budget.
Speaker Coverage Area
In most cases, determining the area covered by a ceiling speaker involves projecting the speaker’s (conical) coverage angle out to the distance between the speaker and the listener, and calculating the area of the resulting circle. Remember to account for the height of the listener in
calculating the effective ceiling height. The wider the coverage angle, the larger the coverage
area, the fewer speakers needed for the same evenness of coverage. Coverage areas for all of
TOA’s ceiling-mount speaker models are listed beginning on page 36 in Chapter 8: Speaker
Application Tables.
24
TOA Electronics Speaker Guide Layout and Spacing for Distributed Speaker Systems
Speaker
Ceiling
Coverage
angle
Ceiling
height (h)
Ear
height (l)
Floor
Figure 6-1 Ceiling speaker coverage area
The speaker’s dispersion characteristics affect not only the required spacing and number of
speakers, but also the overall sound quality and performance of the system. Large speaker
cones (for example, an 8-inch full-range ceiling speaker) tend to produce narrow coverage angles
in the high frequencies (called beaming), which cause dead spots between speakers unless they
are spaced very closely together. Regardless of the speaker spacing, their overall diffuse-field
output will still be lower in the high frequencies compared to their on-axis performance, leading
to a dull sound in most of the listening area. TOA’s F Series wide dispersion ceiling speakers
include features engineered to avoid this common problem, resulting in higher sound quality
throughout the listening area.
Coverage Area and Ceiling Height
As the ceiling height increases, the area a speaker can cover increases, but the power required
to reach the same volume at the listener’s position also increases. If the ceiling is very high (i.e.,
over 20 ft) some speakers may not be able to handle the power required for that distance. For
ceiling heights greater than about 25 ft, consider alternatives such as mounting speakers on
columns and walls, or suspending them below the ceiling, to get them closer to the listeners.
Low ceilings are also challenging: for a ceiling lower than 12 ft, use a speaker with a coverage
angle of 120° or greater.
Coverage Density vs. Budget
Once the coverage area per speaker is known, the next step is to decide how much overlap is
needed between speakers. In distributed systems, higher density, or closer spacing of the
speakers, provides more consistent coverage. If the speakers are spread too far, large portions
of the listening area may suffer from inadequate volume and poor sound quality. The only
downside of close spacing is cost. Balancing coverage density versus system cost is ultimately a
subjective decision, but the information that follows can be a useful guide.
25
TOA Electronics Speaker Guide Layout and Spacing for Distributed Speaker Systems
Layout Patterns
Square and hexagonal patterns are the layouts most commonly used in ceiling speaker systems.
The choice of pattern depends on the best fit between speakers and room dimensions. The
square pattern may also be rotated 45° or as needed to fit the shape of the room.
Speaker Spacing
Three standard speaker spacing methods are commonly employed in distributed systems. The
spacing distance is based on the radius of the coverage area, and how much adjacent speakers
should overlap. The amount of overlap determines the consistency of sound coverage: more
overlap means more consistent loudness and sound quality. Standard spacing distances for all
of TOA’s ceiling speaker models are listed in Chapter 8: Speaker Application Tables.
No Overlap (spacing distance = 2r, where r is the radius of the speaker’s coverage area): The
coverage area of each speaker meets but does not overlap the coverage of adjacent speakers
(Figure 6-2). This spacing will leave some gaps in coverage. It is used for low-cost background
music and paging systems.
Figure 6-2 Speaker coverage with no overlap: hexagonal (left), square (right)
Minimum Overlap (spacing distance = for square pattern, for hex pattern): The
r2 r3
coverage of each speaker overlaps adjacent speakers just enough to avoid any gaps in coverage,
but no more (Figure 6-3). Minimum overlap performs much better than no overlap. The spacing
depends on whether the speakers are in a square or hexagonal pattern.
Figure 6-3 Speaker coverage with minimum overlap: hexagonal (left), square (right)
26
TOA Electronics Speaker Guide Layout and Spacing for Distributed Speaker Systems
Edge-to-Center (also called center-to-center; spacing distance = radius of the coverage area):
The edge of each speaker’s coverage area meets the center of adjacent speakers’ coverage areas
(Figure 6-4). This is the highest speaker density commonly used in distributed systems and
gives the best performance. Where the room acoustics are poor or background noise is high,
this spacing may be required for intelligible speech.
Figure 6-4 Speaker coverage with edge-to-center overlap: hexagonal (left), square (right)
27
TOA Electronics Speaker Guide Layout and Spacing for Distributed Speaker Systems
Wall-Mount Speakers
NOTE: Before considering a wall-mount installation, determine whether the construction will
support the speakers and that the mounting hardware can be installed properly.
The factors guiding the layout of wall-mount speakers are the same as for ceiling speakers: The
area covered by each speaker, the evenness of coverage desired, and the client’s budget. Calculating the coverage area, however, is more complex and less precise. In addition, the spacing
is controlled by the designer only in one plane (along the wall), unless you have the luxury of
specifying room dimensions in the sound system design. Aiming and setting the speaker’s
height is important and is guided by the room dimensions, especially the distance to the opposite wall (or to the farthest listeners).
Speaker Coverage Area
An approximate value for the coverage area of a speaker mounted to the wall and aimed at an
off-angle to the floor can be obtained by projecting two triangles from the speaker to the listening plane, representing the horizontal and vertical coverage. In most instances, only half the
rated vertical coverage angle should be used, with the speaker’s central axis aimed at the farthest point to be covered. This results in a triangular coverage pattern that closely approximates
the sound distribution from a wall-mounted speaker. It is important to bear in mind the effect
of distance as well as speaker dispersion when calculating coverage. In the horizontal plane,
the width of the coverage area is affected by the added distance from the speaker when moving
off-axis along a line perpendicular to the coverage axis. The effective coverage angle is thus
narrower than the speaker’s rated coverage angle for purposes of calculating the coverage area
and the spacing. In the vertical plane (or near-to-far), the depth of the coverage area is affected
by the increasing proximity as the listener moves under the speaker. Thus, the effective vertical
coverage is greater than the rated vertical coverage angle. Coverage areas for all of TOA’s
wall-mount speaker models are listed in Chapter 8: Speaker Application Tables.
Speaker
height (h)
Figure 6-5 Wall-mount speaker coverage area
Ceiling
Coverage angle
(adjusted for distance)
Wall
Floor
28
Ear
height (l)
TOA Electronics Speaker Guide Layout and Spacing for Distributed Speaker Systems
Speaker Spacing and Layout Pattern
Because of the triangular shape of the coverage area, wall-mount speakers work best when
placed on facing walls and staggered so that each speaker is aimed at a point mid-way between
two speakers on the opposite wall, at about ear level. The best spacing between speakers depends
on their height and distance to the opposite wall. This is because the width of the triangular
coverage area is proportional to its depth. Recommended spacings for all of TOA’s wall-mount
speaker models are listed in Chapter 8: Speaker Application Tables.
Subwoofers
To calculate the number of subwoofers needed, determine the maximum rated output of a
single subwoofer (see The Decibel on page 17, and Determining Maximum Output: Sensitivity
and Power Handling on page 21), and add a placement factor to this value (see below). Then add
subwoofers until this level is 6–9 dB higher than the main speakers. To increase the distributed
subwoofer level by 3 dB, double the number of subwoofers and the total power driving them.
Placement Factor: The placement of the subwoofers with respect to walls, floors, and other
hard boundaries affects the system amplitude response. Compared to a subwoofer suspended
in free air, a subwoofer next to one rigid wall increases its output 3–6 dB with the same power
input, depending how close it is to the wall (the closer the better). A subwoofer located in a
junction between two boundaries (two walls, one wall and floor or ceiling) increases its output
6–9 dB. A subwoofer located in the junction between three boundaries (two walls and the floor
or ceiling) increases its output 9–15 dB (equivalent to increasing the input power by a factor of
8–30). Note the conditions under which the subwoofer was rated (i.e., half-space, which means
against, or built into, one boundary), and when calculating maximum output, factor in the
speaker placement in comparison to the measurement condition. For example, if the speaker
was measured under half-space conditions, but will be used on the floor in a corner, then add
6–9 dB to the speaker’s maximum output level.
Fraction-space loading can be described in greater detail as follows:
The maximum SPL of a subwoofer is increased by placing it against one or more boundaries. This
effect, known as bass or fraction-space loading, begins to occur when the speaker is within 1/8
wavelength at a given frequency from the boundary, and increases the output 3–6 dB (depending on the actual distance) for each boundary. For example, at 100 Hz (wavelength = 11.3 ft),
with the subwoofer positioned 2.825 ft from the floor, the level will be 3 dB higher than a subwoofer
suspended in free air. A subwoofer flush-mounted onto the floor or a large wall (known as half-
space loading) has a level 6 dB higher than if it were suspended in free air. Each additional boundary
increases the output 3–6 dB. For example, placing the subwoofer at the junction of two boundaries (quarter-space loading) adds 6–12 dB; three boundaries (eighth-space loading) increases
the output 9–15 dB. These boundaries must be massive and rigid enough to contain the wave front
without flexing. Thin materials, such as curtains or temporary walls, will not produce this effect. The
surfaces must be large enough to support the wavelength of the relevant frequencies; at least one
wavelength of surface dimension is required to gain the full 6 dB increase.
29
TOA Electronics Speaker Guide
Chapter 7: Amplifier Selection
Direct Connection or Constant Voltage
Installed sound systems commonly use either a direct connection (also called low impedance)
or constant voltage (also called high impedance) amplifier/speaker interface. Direct connection
to a low impedance amplifier allows up to two 8 Ω speakers to be safely driven without resorting
to series-parallel wiring, which is inadvisable in most situations. To connect more than two speakers
per amplifier channel, most distributed speaker systems use the constant voltage method.
Constant voltage speaker lines (i.e., 70.7 or 25 V) do not actually have constant voltage on
them. Their line impedance is varied using transformers to achieve the same theoretical maximum
voltage in any system. This approach makes it simple to design and scale systems as needed.
Each system uses a step-up transformer on the output of the amplifier to raise its source impedance, and step-down transformers on each speaker to raise their load impedance. The speaker
transformer load impedances are given in Watts (based on the rated line voltage) instead of
Ohms, to simplify system set-up. In addition to making system design and expansion easier,
constant voltage lines also dramatically reduce speaker cable costs, especially in large systems,
by reducing the required thickness of cable for a given distance run. The following sections
demonstrate the design of constant voltage systems.
Power Requirements
NOTE: The term L
Once the number and placement of speakers is decided, calculate the required amplifier power.
First, calculate the power required per speaker using the following steps:
1. Determine the L
adding 6–10 dB above the expected operating level.
2. Find the speaker’s sensitivity rating (SPL, 1 W @ 1 m) from the specifications list
Chapter 8: Speaker Application Tables.
3. Use the chart for attenuation over distance (see Figure 5-1 on page 22), find the speaker’s level at the listener with an input of 1 W (Lw) as follows: In the top half of the
chart, find the distance from speaker to listener, then read the amount of attenuation
(dB) from the bottom half of the chart. Subtract this amount from the sensitivity rating
to get the level at the listener with 1 W input (Lw).
4. Subtract Lw from L
ference is negative, it is safe to assume that dBW is zero.
will be used denote required level.
req
including headroom for program peaks. Headroom is included by
req
to obtain the level increase needed above 1 W (dBW). If the dif-
req
30
TOA Electronics Speaker Guide Amplifier Selection
5. Use the top half of the chart for level change with power input (see Figure 5-2 on page
22) to locate the point corresponding to the required level increase, or dBW. Next, read
the power level from the bottom half of the chart. Then, using the speaker’s specifications,
select the speaker’s smallest wattage tap that is greater than the power level indicated
on the chart. This is the minimum power you need for each speaker.
6. After determining the power needed for each speaker, add them up to get the total
speaker Wattage.
To allow for variations in transformer characteristics, it is a good practice to select an amplifier
whose rated output is at least 120% of the speaker Wattage total. If the speakers are connected
directly (in a 4 or 8 Ω system), the amplifier size should be at least equal to the speaker Wattage
total.
Subwoofer Power Requirements
To get full value from subwoofers, we recommend supplying them with as much power as they
can safely handle. The maximum continuous pink noise power rating is a good indicator of the
minimum power to provide for a subwoofer. This amount can be doubled if the added power
falls within budget. The subwoofer’s maximum program (sometimes called peak) rating typically
indicates the maximum power you should provide. Due to the nature of low frequency program
material, there is much room for error in any general guidelines for subwoofers. The best method
to insure the amplifier and subwoofer are matched is to listen to them together, using the same
speaker location and program material that will be used in the final job.
Examples
High-Quality Paging System
A workspace needs reliable and intelligible paging in all areas, for both standing and seated
listeners. The room is 30 x 40 ft with a 10 ft ceiling. TOA model F-121CM speakers are selected
for their wide dispersion.
From the F-121CM’s coverage and spacing table (page 37), we first refer to the row corresponding to the ceiling height for standing listeners (4 ft above listener height; h - l = 4). The
spacing recommendations for this height range from 7–14 ft, depending on the desired uniformity of coverage. Using a square pattern with minimum overlap, the spacing between speakers
is 10 ft, which works out to three rows of four speakers (12 speakers total).
Since the workspace will have a minimal noise level, the target operating level is set slightly
above the base level (75 dB) for paging, at 78 dB, with 10 dB of headroom, for a L
The F-121CM has a rated sensitivity of 90 dB, 1 W @ 1 m. The typical seated listener will be
about 7–8 feet away from the nearest speaker. Using the attenuation with distance chart (see
Figure 5-1 on page 22), this provides 82 dB with 1 W at the listener.
of 88 dB.
req
31
TOA Electronics Speaker Guide Amplifier Selection
Using the level change with power input chart (see Figure 5-2 on page 22), we see that 4 W per
speaker provides the 6 dB needed to reach the L
. The speaker’s smallest available transformer
req
tap above 4 W is 5 W. Add the speakers at 5 W each to yield a total of 60 W. Multiply by 1.2
(120%) to get the minimum amplifier power: 72 W.
Outdoor Paging System
Paging is needed in an outdoor area. The area is 100 x 200 ft (20,000 sq. ft), and the speakers
will be mounted on poles along the center of the area (200 ft). TOA model SC-615T is selected
for its high efficiency and wide area coverage.
From the coverage depth column of the SC-615T coverage and spacing table (page 53), we see
that mounting a speaker 10 ft above the listener’s ear level and aiming it down by 10° results
in a coverage area that extends 57 ft from the base of the speaker’s mounting surface. This positioning allows reaching the edges of our outdoor area from poles along the center line.
When mounted 10 ft above ear level (approx. 16 ft high), the rated coverage area of the SC-615T
is 1713 sq. ft, suggesting that 12 horns are needed to cover the space smoothly. Ideally, the
horns should be mounted on the central poles, back-to-back, aiming outward.
Assume the measured noise levels in this outdoor setting are 70 dB (A-weighted). The operating level should be 90 dB, with 6–10 dB headroom, for a L
of 96–100 dB.
req
From the SC-615Tcoverage and spacing table (page 53), we see that when mounted 10 ft above
ear level and aimed down 10°, it delivers 99 dB SPL to the farthest on-axis listener, at 57 ft
from the base of the speaker’s mounting surface. This is based on operation at the maximum
transformer tap of 15 W, and is within our target range. Adding 12 speakers at 15 W yields a
speaker total of 180 W. Multiply by 1.2 (120%) for a minimum amplifier rating of 216 W.
To economize, we could lower the operating level to 96 dB. Using the level change with power
input chart (see Figure 5-2 on page 22), we see that a drop of 3 dB reduces the power requirement by a factor of 2, for a minimum amplifier power of 108 W. Since this brings our headroom
down to 6 dB, it is wise to use a paging mic input with built-in compression. This is a good idea
for any paging system in noisy environments, but especially when headroom is limited. The
TOA model M-61S input module performs this function when used with a 900 Series mixer or
mixer/amplifier.
32
TOA Electronics Speaker Guide Amplifier Selection
High-Quality Multi-Purpose System
A multi-purpose room needs high-quality sound for video and A/V presentations, speech reinforcement, and background music for company functions. The room is 40 x 80 ft with a 12 ft
ceiling. TOA model F-121CM speakers are selected for their ability to meet the wide-ranging
requirements.
From the F-121CM’s coverage and spacing table (page 37), we see that spacing recommendations range from 10–21 ft for standing listeners (h – l = 6 ft.) and 14–28 ft for seated listeners
(h – l = 8 ft). Selecting a square pattern and spacing the speakers at 20 ft intervals puts us within
both ranges and allows a simple layout of two rows of four speakers (8 total).
To deliver convincing, distortion-free movie sound, the system should be designed for a maximum average level of 85 dB at the listeners, with 10 dB of headroom for transient peaks, for
a L
of 95 dB.
req
The F-121CM has a rated sensitivity of 90 dB, 1 W @ 1 m. Using the attenuation with distance
chart (see Figure 5-1 on page 22), we find that this gives us 82 dB with 1 W at the listener.
Using the level change with power input chart (see Figure 5-2 on page 22), we see that 20 W
per speaker provides the 13 dB to reach the L
. Adding them up yields a speaker total of
req
160 W. Multiply by 1.2 (120%) to yield the minimum amplifier power: 192 W.
33
TOA Electronics Speaker Guide
Chapter 8: Speaker Application Tables
How to Use This Section
This section is intended to serve as a quick reference to speed and ease system design. Keep in
mind the following points to ensure best use of the tables.
All Speakers
Speaker height is relative to listener height. If the value for Height Above Listener is 2, that
means the speakers are placed 2 ft above the expected ear level of the listeners.
Coverage Area and Spacing recommendations are based on an adjusted estimate of coverage
(averaged over the frequency range 1–4 kHz) that accounts for both speaker dispersion and listener distance relative to the speaker. This may make the numbers appear smaller than those
found in other design guides but they will more accurately reflect real-world performance.
Maximum On-Axis SPL figures are based on operation at the highest transformer tap. Pink
noise power capacity is used for speakers without transformers.
Ceiling Speakers
Spacing recommendations for ceiling speakers are based on the radius of the adjusted coverage
area (as described in Sound System Engineering) except that in this guide, the term Edge to Center
is used to describe the condition when the edge of one speaker’s coverage overlaps up to the
center of the next speaker’s coverage (center to center spacing in Sound System Engineering).
Speaker
Ceiling
Coverage
angle
Ceiling
height (h)
Ear
height (l)
Floor
34
TOA Electronics Speaker Guide Speaker Application Tables
Wall-mount Speakers
Spacing recommendations for wall-mounted speakers will vary dramatically depending on the
height and aiming of the speakers, whether there is a facing wall, and how far away it is. When
there is a facing wall up to 30 ft away, speakers should be staggered: speakers on one wall
should be located and aimed mid-way between those on the opposite wall. If the facing wall is
more than 30 ft away, we recommend using ceiling or other speakers to cover the center of the
room to avoid echoes that degrade intelligibility. In outdoor areas, it is best to place speakers
back-to-back, aimed outward when broad coverage is needed.
Ceiling
Speaker
Coverage angle
(adjusted for distance)
height (h)
Ear
Wall
height (l)
Floor
Downward Tilt refers to the number of degrees below horizontal the speaker is aimed.
Coverage Area is a very conservative estimate of the triangular area within which coverage will
not vary more than ±3 dB (±4 dB where the downward tilt is 10°, due to the effects of distance),
when averaged over the frequency range of 1–4 kHz.
Coverage Depth refers to the minimum, or perpendicular, distance between the far limit of the
coverage area and the wall or surface that the speaker is mounted on. For best coverage, listeners should be no farther from the wall (pole, etc.) than this.
Maximum Spacing for Rated Coverage Depth: This number is equal to the width of the triangular coverage area at its wide end. The coverage area is this wide when the farthest listeners
are a distance from the base of the speaker’s mounting surface equal to the value of Coverage
Depth. For example, if the Coverage Depth is 20 ft, and the Edge to Edge Spacing is 25 ft, then
the far left corner of one speaker’s coverage meets the far right corner of another speaker’s coverage at a point 20 ft perpendicular from the wall on which the speakers are mounted. Maximum spacing should only be used indoors, when speakers are placed on two facing walls, and
when the distance between the walls is approximately equal to the rated Coverage Depth. Closer spacing is needed if the walls are closer than the rated Coverage Depth.
35
TOA Electronics Speaker Guide Speaker Application Tables
Ceiling-mount Speakers
F-101C/M
F-101C/M Specifications
Coverage Angle 120º H x 120º V
Frequency Response
Sensitivity (1 W / 1 m) 90 dB
Power Handling
Tran sformer Taps
(F-101CM only)
Components 4.7" driver
Installation Accessories
(optional)
F-101C/M Coverage And Spacing
Height
Above
Listener
h-l (ft)
213 2 3 3 4107
328 3 4 5 6104
Coverage
Area (sq. ft)
Edge to Center
Overlap
Min. Overlap
(square)
Spacing (ft)
80 Hz – 18 kHz
F-101CM: 20 W transformer
F-101C: 40 W pink noise
70.7/100 V: 1, 3, 5, 10, 20 W
TBF-100 Tile Bridge, BBF-100 Back Box
Min. Overlap
(hex)
No
Overlap
Max. OnAxis SPL
450 4 6 7 8101
579 5 7 9 1099
6 113 6 8 10 12 98
8201 8 11 14 1695
10 314 10 14 17 20 93
12 452 12 17 21 24 92
14 616 14 20 24 28 90
16 804 16 23 28 32 89
18 1018 18 25 31 36 88
20 1257 20 28 35 40 87
36
TOA Electronics Speaker Guide Speaker Application Tables
F-121C/M
F-121C/M Specifications
Coverage Angle hemispherical
Frequency Response 80 Hz – 18 kHz
Sensitivity (1 W / 1 m) 90 dB
Power Handling
Tran sformer Tap
(F-121CM only)
Components 4.7" driver with diffuser cone
Installation Accessories
(optional)
900 Series Equalizer Module E-03R module or AC-120 stand-alone EQ
F-121C/M Coverage And Spacing
Height
Above
Listener
h-l (ft)
238 3 5 6 7107
385 5 7 9 10104
4 151 7 10 12 14 101
Coverage
Area (sq.
ft)
Edge to Center
Overlap
Min. Overlap
(square)
Spacing (ft)
F-121CM: 20 W transformer
F-121C: 40 W pink noise
70.7/100 V: 1, 3, 5, 10, 20 W
TBF-100 Tile Bridge, BBF-100 Back Box
Min. Overlap
(hex)
No
Overlap
Max. OnAxis SPL
5236 9 12 15 1799
6 339 10 15 18 21 98
8 603 14 20 24 28 95
10 942 17 24 30 35 93
12 1357 21 29 36 42 92
14 1847 24 34 42 48 90
16 2413 28 39 48 55 89
18 3054 31 44 54 62 88
20 3770 35 49 60 69 87
37
TOA Electronics Speaker Guide Speaker Application Tables
PC-671R/RV
PC-671R/RV Specifications
Coverage Angle 65º H x 65º V
Frequency Response 90 Hz – 16 kHz
Sensitivity (1 W / 1 m) 96 dB
Power Handling 6 W pink noise
Transformer Taps 25/70.7 V: 0.5, 1, 2, 3, and 6 W
Components 8" driver
PC-671R/RV Coverage And Spacing
Height
Above
Listener
h-l (ft)
25 1 2 2 3108
311 2 3 3 4 105
420 3 4 4 5 102
532 3 5 6 6 100
646 4 5 7 8 99
882 5 7 9 10 96
10 128 6 9 11 13 94
12 184 8 11 13 15 93
14 250 9 13 15 18 91
16 326 10 14 18 20 90
18 413 11 16 20 23 89
20 510 13 18 22 25 88
Coverage
Area (sq. ft)
Edge to Center
Overlap
Min. Overlap
(square)
Spacing (ft)
Min. Overlap
(hex)
No
Overlap
Max. On-
Axis SPL
38
TOA Electronics Speaker Guide Speaker Application Tables
H-1
H-1 Specifications
Coverage Angle 120º H x 100º V
Frequency Response 120 Hz – 20 kHz
Sensitivity (1 W / 1 m) 85 dB
Power Handling
Transformer Taps 70.7/100 V: 3, 6, 12 W
Components
Installation Accessories HY-H1 pre-installation kit (optional)
900 Series Equalizer Module E-04R
H-1 Coverage And Spacing (Ceiling Mount)
Height
Above
Listener
h-l (ft)
29 2 2 3 3 100
320 3 4 4 5 97
435 3 5 6 7 94
555 4 6 7 8 92
Coverage
Area (sq. ft)
Edge to Center
Overlap
Min. Overlap
(square)
Spacing (ft)
Min. Overlap
(hex)
Transformer:12 W
4 Ω Direct: 30 W pink noise
LF: 3" x 2" Neodymium
HF: 3/4" Ferrofluid-cooled dome
Max. On-
No
Overlap
Axis SPL
6 80 5 7 9 10 91
8 142 7 9 12 13 88
10 221 8 12 15 17 86
12 319 10 14 17 20 85
14 434 12 17 20 23 83
16 566 13 19 23 27 82
18 717 15 21 26 30 81
20 885 17 24 29 34 80
39
TOA Electronics Speaker Guide Speaker Application Tables
H-1 Coverage and Spacing (Wall Mount)
Height Above
Listener
h-l (ft)
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth (ft)
Maximum Spacing for
Rated Coverage Depth
(ft)
2 10 124 11 23 85
3 10 280 17 35 82
4 10 498 23 46 79
5 10 778 28 58 77
4 20 124 11 23 85
5 20 194 14 29 83
6 20 280 16 35 81
8 20 498 22 47 79
10 20 778 27 58 77
8 30 233 14 32 82
10 30 364 17 40 80
12 30 524 21 48 79
Max. SPL for
Farthest On-Axis
Listener (dB)
40
TOA Electronics Speaker Guide Speaker Application Tables
H-2/WP
H-2/WP Specifications
Coverage Angle 100º H x 60º V
Frequency Response 100 Hz – 20 kHz
Sensitivity (1 W / 1 m) 88 dB
Power Handling
Transformer Taps 70.7/100 V: 3, 6, 12 W
Components
Weather-Resistant version H-2WP
900 Series Equalizer Module E-05R
H-2/WP Coverage And Spacing
Spacing (ft)
h-l (ft)
292 2 3 3 103
320 3 4 4 5 100
435 3 5 6 7 97
555 4 6 7 8 95
Coverage
Area (sq. ft)
Edge to Center
Overlap
Min. Overlap
(square)
Min. Overlap
(hex)
Transformer: 12 W
4 Ω Direct: 30 W pink noise
LF: 4.7" Neodymium
HF: 3/4" Ferrofluid-cooled dome
Max. On-
No
Overlap
Axis SPL
6 80 5 7 9 10 94
8 142 7 9 12 13 91
10 221 8 12 15 17 89
12 319 10 14 17 20 88
14 434 12 17 20 23 86
16 566 13 19 23 27 85
18 717 15 21 26 30 84
20 885 17 24 29 34 83
41
TOA Electronics Speaker Guide Speaker Application Tables
Wall-mount Speakers
BS-1030B/W
BS-1030B/W Specifications
Coverage Angle 100º H x 100º V
Frequency Response 80 Hz – 20 kHz
Sensitivity (1 W / 1 m) 90 dB
Power Handling
Transformer Taps 70.7/100 V: 5, 10, 15, 20, 30 W
Components
Installation
Accessories
BS-1030B/W Coverage and Spacing
Height Above
Listener h-l
(ft)
2 10 103 11 19 94
3 10 231 17 29 90
4 10 410 23 39 88
5 10 641 28 48 86
4 20 101 11 20 94
5 20 158 14 25 92
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing for
Rated Coverage Depth
Transformer: 30 W
8 Ω Direct: 30 W pink noise
LF: 4.7" cone
HF: 1" balanced-dome
Mounting bracket included
WCB-12/W swivel bracket (optional)
(ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
6 20 227 16 29 90
8 20 404 22 39 88
10 20 631 27 49 86
8 30 186 14 27 91
10 30 291 17 34 89
12 30 419 21 40 87
42
TOA Electronics Speaker Guide Speaker Application Tables
BS-20W/WHT
BS-20W/WHT Specifications
Coverage Angle 30º H x 90º V
Frequency Response 100 Hz – 20 kHz
Sensitivity (1 W / 1 m) 94 dB
Power Handling 20 W
Transformer Taps 70.7/100 V: 5, 10, 15, 20 W
Components
Installation
Accessories
BS-20W/WHT Coverage and Spacing
Height
Above
Listener h-l
(ft)
2 10 103 11 19 96
3 10 231 17 29 93
4 10 410 23 39 90
5 10 641 28 48 88
4 20 101 11 20 96
5 20 158 14 25 94
6 20 227 16 29 92
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing for
Rated Coverage
Depth (ft)
LF: 5.25" cone
HF: CD horn and piezo
Mounting bracket included
Max. SPL for
Farthest On-Axis
Listener (dB)
8 20 404 22 39 90
10 20 631 27 49 88
8 30 186 14 27 93
10 30 291 17 34 91
12 30 419 21 40 90
43
TOA Electronics Speaker Guide Speaker Application Tables
CS-64, CS-154, CS-304
CS Series Specifications
CS-64 CS-154 CS-304
Coverage Angle (2 kHz) 100º H x 100º V 110º H x 85º V 110º H x 85º V
Frequency Response 130 Hz – 13 kHz 150 Hz – 15 kHz 120 Hz – 15 kHz
Sensitivity (1 W / 1 m) 96 dB 97 dB 98 dB
Power Handling
(transformer)
Transformer Taps
Components
Installation
Accessories
6 W 15 W 30 W
70.7 V: 0.5, 1.5, 3, 6 W
100 V: 1, 3, 6 W
4.7" Full-range, weatherresistant treated cone
Stainless steel mounting
bracket included
70.7 V: 2.5, 7.5, 15 W
100 V: 5, 10, 15 W
4.7" Full-range, weatherresistant treated cone
Stainless steel mounting
bracket included
70.7 V: 5, 10, 15, 30 W
100 V: 10, 20, 30 W
4.7" Full-range, weatherresistant treated cone
Stainless steel mounting
bracket included
44
TOA Electronics Speaker Guide Speaker Application Tables
CS-64 Coverage and Spacing
Height Above
Listener h-l
(ft)
210 7411 15 93
3 10 166 17 22 90
4 10 296 23 29 87
5 10 462 28 37 85
420 7011 15 93
5 20 109 14 19 91
6 20 156 16 22 89
8 20 278 22 30 87
10 20 435 27 37 85
8 30 123 14 20 90
10 30 192 17 25 88
12 30 277 21 31 87
Height Above
Listener h-l
(ft)
3 10 258 17 35 95
4 10 458 23 46 92
5 10 716 28 58 90
610103134 69 89
810183245 92 86
10 10 2863 57 115 84
6 20 240 16 35 94
8 20 427 22 47 92
10 20 667 27 58 90
12 20 960 33 70 88
14 20 1307 38 82 87
16 20 1707 44 94 86
10 30 293 17 40 93
12 30 422 21 48 92
14 30 574 24 56 90
16 30 750 28 64 89
18 30 949 31 72 88
Downward
Tilt
(degrees)
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
CS-154 Coverage and Spacing
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
Max. SPL for
Farthest On-Axis
Listener (dB)
45
TOA Electronics Speaker Guide Speaker Application Tables
CS-304 Coverage and Spacing
Height Above
Listener h-l
(ft)
4 10 384 23 39 96
5 10 601 28 48 94
6 10 865 34 58 93
810153745 77 90
10 10 2402 57 97 88
8 20 358 22 39 96
10 20 560 27 49 94
12 20 806 33 59 92
14 20 1097 38 69 91
16 20 1433 44 79 90
10 30 246 17 34 97
12 30 354 21 40 96
14 30 482 24 47 94
16 30 629 28 54 93
18 30 796 31 60 92
20 30 983 35 67 91
22 30 1189 38 74 90
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
46
TOA Electronics Speaker Guide Speaker Application Tables
F-160G/W, F-240G/W
F-160/F-240 Specifications
F-160 F-240
Coverage Angle 90º H x 90º V 90º H x 90º V
Frequency Response
Sensitivity (1 W / 1 m) 91 dB 92 dB
Power Handling
Transformer Taps (F-160GM/WM,
F-240GM/WM only)
Components
Installation Accessories WCB-12/W swivel bracket CMB-31W, WCB-24/W swivel bracket
100 Hz – 20 kHz
(1/2- or 1/4-space)
30 W (F-160GM/WM)
50 W pink noise (F-160G/W)
70.7 V: 2.5, 5, 10, 15, 30 W
100 V: 5, 10, 20, 30 W
LF: 5.25"
HF: 1" Dome
65 Hz – 20 kHz
(1/2- or 1/4-space)
30 W (F-240GM/WM)
50 W pink noise (F-240G/W)
70.7 V: 2.5, 5, 10, 15, 30 W
100 V: 5, 10, 20, 30 W
LF: 6.5"
HF: 1" Dome
47
TOA Electronics Speaker Guide Speaker Application Tables
F-160/F-240 Coverage and Spacing
Height Above
Listener h-l
(ft)
2 10 113 11 21 95 / 96
3 10 254 17 32 92 / 93
4 10 452 23 42 89 / 90
5 10 707 28 53 87 / 88
4 20 112 11 21 95 / 96
5 20 175 14 27 93 / 94
6 20 252 16 32 91 / 92
8 20 449 22 43 89 / 90
10 20 701 27 54 87 / 88
8 30 208 14 29 92 / 93
10 30 325 17 37 90 / 91
12 30 469 21 44 89 / 90
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
F-160/F-240
48
TOA Electronics Speaker Guide Speaker Application Tables
F-505G/W, F-605G/W
F-505/F-605 Specifications
F-505G/W F-605G/W
Coverage Angle 60º H x 40º V 60º H x 40º V
Frequency Response 70 Hz – 20 kHz 65 Hz – 20 kHz
Sensitivity (1 W / 1 m) 93 dB 98 dB
Power Handling 80 W pink noise 80 W pink noise
Impedance 8 Ω 8 Ω
Components
Installation Accessories HY-30/W, HY-501B/W HY-30/W, HY-601B/W
LF: 8"
HF: CD horn and compression driver
LF: 12"
HF: CD horn and compression driver
49
TOA Electronics Speaker Guide Speaker Application Tables
F-505/F-605 Coverage and Spacing
Height Above
Listener h-l
(ft)
4 10 268 23 27 95 / 100
6 10 603 34 40 92 / 97
8 10 1071 45 53 89 / 94
10 10 1674 57 66 87 / 92
12 10 2410 68 80 86 / 91
8 20 252 22 27 95 / 100
10 20 394 27 34 93 / 98
12 20 567 33 41 91 / 95
14 20 772 38 47 90 / 95
16 20 1008 44 54 89 / 94
18 20 1276 49 61 88 / 93
20 20 1575 55 68 87 / 92
20 30 698 35 46 90 / 95
24 30 1005 42 55 89 / 94
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
F-505/F-605
50
TOA Electronics Speaker Guide Speaker Application Tables
H-3/WP
H-3/WP Specifications
Coverage Angle 140º H x 70º V
Frequency Response 100 Hz – 20 kHz
Sensitivity (1 W / 1 m) 89 dB
Power Handling
Transformer Taps
Components
Installation
Accessories
900 Series Equalizer
Module
H-3/WP Coverage and Spacing
Height Above
Listener h-l
(ft)
2 10 133 11 27 93
3 10 298 17 41 90
4 10 531 23 55 87
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Tran sformer: 30 W
8 Ω Direct: 50 W pink noise
70.7 V: 3.75, 7.5, 15, 30 W
100 V: 7.5, 15, 30 W
LF: Two 4" Neodymium
HF: 1" Dome
Wall-mounting plate included
E-06R (optional)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
5 10 829 28 69 85
4 20 121 11 28 93
5 20 189 14 35 91
6 20 272 16 42 89
8 20 484 22 56 87
10 20 756 27 70 85
8 30 209 14 38 90
10 30 326 17 48 88
12 30 470 21 57 87
51
TOA Electronics Speaker Guide Speaker Application Tables
Paging Horns
SC-610/T, SC-615/T, SC-630/T, SC-650
Coverage
Angle
Frequency
Response
Sensitivity
(1 W / 1 m)
Power
Handling
Tran sformer
Tap s
Components
Installation
Accessories
SC Series Specifications
SC610/T SC615/T SC630/T SC650
70º H x 100º V 70º H x 90º V 55º H x 70º V 55º H x 45º V
315 Hz – 12.5 kHz 280 Hz – 12.5 kHz 250 Hz – 10 kHz 250 Hz – 6 kHz
110 dB 112 dB 113 dB 108 dB
10 W 15 W 30 W 50 W
70.7 V: 0.5, 1.5, 3, 6 W
100 V: 1, 3, 6 W
Phenolic diaphragm
compression driver
Stainless steel mounting
bracket included
70.7 V: 2.5, 7.5, 15 W
100 V: 5, 10, 15 W
Phenolic diaphragm
compression driver
Stainless steel mounting
bracket included
70.7 V: 5, 10, 15, 30 W
100 V: 10, 20, 30 W
Phenolic diaphragm
compression driver
Stainless steel mounting
bracket included
not applicable
Phenolic diaphragm
compression driver
Stainless steel mounting
bracket included
52
TOA Electronics Speaker Guide Speaker Application Tables
SC-610/T Coverage and Spacing
Height Above
Listener h-l
(ft)
4 10 282 23 27 103
5 10 441 28 33 101
6 10 635 34 40 100
810112945 53 97
10 10 1765 57 66 95
12 10 2541 68 80 94
8 20 278 22 27 103
10 20 434 27 34 101
12 20 625 33 41 99
12 30 288 21 28 103
16 30 512 28 37 100
20 30 800 35 46 98
Height Above
Listener h-l
(ft)
Downward
Tilt
(degrees)
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
SC-615/T Coverage and Spacing
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Maximum Spacing
for Rated Coverage
Depth (ft)
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
Max. SPL for
Farthest On-Axis
Listener (dB)
4 10 274 23 27 107
6 10 617 34 40 104
8 10 1096 45 53 101
10 10 1713 57 66 99
12 10 2466 68 80 98
14 10 3357 79 93 96
16 10 4384 91 106 95
18 10 5549 102 120 94
10 20 411 27 34 105
12 20 591 33 41 103
14 20 805 38 47 102
16 20 1051 44 54 101
18 20 1330 49 61 100
20 20 1642 55 68 99
16 30 473 28 37 104
20 30 739 35 46 102
24 30 1064 42 55 101
53
TOA Electronics Speaker Guide Speaker Application Tables
SC-630/T Coverage and Spacing
Height Above
Listener h-l
(ft)
6 10 467 34 32 108
8 10 830 45 43 105
10 10 1298 57 54 103
12 10 1869 68 64 102
14 10 2543 79 75 100
16 10 3322 91 86 99
18 10 4204 102 97 98
20 10 5190 113 107 97
22 10 6280 125 118 96
10 20 296 27 27 109
12 20 426 33 33 107
14 20 580 38 38 106
16 20 757 44 44 105
18 20 959 49 49 104
20 20 1183 55 55 103
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
20 30 510 35 37 106
24 30 735 42 45 105
54
TOA Electronics Speaker Guide Speaker Application Tables
SC-650 Coverage and Spacing
Height Above
Listener h-l
(ft)
6 10 422 34 32 105
8 10 751 45 43 102
10 10 1173 57 54 100
12 10 1689 68 64 99
14 10 2299 79 75 97
16 10 3003 91 86 96
18 10 3800 102 97 95
20 10 4692 113 107 94
22 10 5677 125 118 93
10 20 250 27 27 106
12 20 360 33 33 104
14 20 489 38 38 103
16 20 639 44 44 102
18 20 809 49 49 101
20 20 999 55 55 100
20 30 408 35 37 103
24 30 588 42 45 102
Downward
Tilt
(degrees)
Coverage
Area
(sq. ft)
Coverage
Depth
(ft)
Maximum Spacing
for Rated Coverage
Depth (ft)
Max. SPL for
Farthest On-Axis
Listener (dB)
55
TOA Electronics Speaker Guide
Appendix A: Wire Size Charts
Table 1 Speaker Cable Lengths (ft) and Gauges (AWG) for 70.7 V Line with 1 dB Power Loss
70.7 V
Load Power
(W)
Wire Gauge
(AWG)
Load Impedance
ΩΩΩΩ
(
)
10 12 14 16 18 20 22
Maximum Cable Distance (ft)
10 490 * * * 7,200 4,600 2,800 1,800
15 327 * * 7,600 4,800 3,000 1,920 1,200
20 245 * 9,200 5,600 3,600 2,200 1,400 900
30 163 10,000 6,200 3,800 2,400 1,500 960 600
40 122 7,400 4,600 2,800 1,800 1,100 700 450
60 81 5,000 3,200 1,900 1,200 730 480 **
100 49 2,900 1,820 1,120 720 230 ** **
200 24.5 1,450 910 560 360 110 ** **
400 12.2 730 460 280 180 ** ** **
Table 2 Speaker Cable Lengths (ft) and Gauges (AWG) for 25 V Line with 1 dB Power Loss
25 V
Wire Gauge
(AWG)
10 12 14 16 18 20 22
Load Power
(W)
Load Impedance
ΩΩΩΩ
(
)
Maximum Cable Distance (ft)
10 61 3,700 2,300 1,400 900 575 350 225
15 41 2,500 1,550 950 600 375 240 150
20 31 1,850 1,150 700 450 275 175 113
30 20 1,250 775 475 300 188 120 **
40 15 925 575 350 225 138 ** **
60 10 625 400 238 150 ** ** **
100 6 363 228 140 90 ** ** **
200 3 18111470********
* Greater than 10,000 feet
** Not recommended, may exceed safe current capacity of wire
A-1
TOA Electronics Speaker Guide
Appendix B: Speaker Mounting Hardware
and Accessory Reference
Model Mounting Hardware Accessories
BS-1030B/W
BS-20W/WHT Ceiling/Wall-Mount Bracket included
F-101C/M
F-121C/M
F-160G/W/M WCB-12/W Ceiling/Wall-Mount Bracket
F-160WP YS-150WP Ceiling/Wall-Mount Bracket
F-240G/W/M
F-505G/W
F-505WP/-L
F-605G/W
F-605WP/-L
FB-100
H-1
H-2/WP
H-3/WP
HB-1
PC-671R/RV Back-box, tile-bridge, and rails (supplied by others)
Ceiling/Wall-Mount Bracket included
WCB-12/W Ceiling/Wall-Mount Bracket (optional)
BBF-100 Back-box (requires TBF-100)
TBF-100 Tile-bridge
BBF-100 Back-box (requires TBF-100)
TBF-100 Tile-bridge
CMB-31/W Ceiling-Mount Bracket
WCB-24/W Wall-Mount Bracket (Economy)
WCB-31/W Wall-Mount Bracket
HY-30/W Ceiling-Mount Bracket
HY-501B/W Wall-Mount Bracket
HY-30/W Ceiling-Mount Bracket
HY-501B/W Wall-Mount Bracket
YS-500 Pole/Wall-Mount Bracket
(requires YS-60B for pole-mounting)
YS-60B Pole bands
HY-30/W Ceiling-Mount Bracket
HY-601B/W Wall-Mount Bracket
HY-30/W Ceiling-Mount Bracket
HY-601 Wall-Mount Bracket
YS-600 Pole/Wall-Mount Bracket
(requires YS-60B for pole-mounting)
YS-60B Pole bands
Six rigging points on enclosure
(mounting hardware supplied by others).
Mounting hardware included
(see installation manual for details)
HY-H1 Wall-Mount Bracket also available separately for pre-construction (included w/ H-1).
Note: Also fits RACO 953 gang-box, supplied by others,
not required for installation.
Mounting hardware included
(see installation manual for details)
Mounting hardware included
(see installation manual for details)
Mounting hardware included
(see installation manual for details)
E-03R 900 Series EQ Module
AC-120 Dual Channel Rack-Mount Processor
E-07S 900 Series Low-Pass-Filter Module
MT-S0601 Matching Transformer
E-04R 900 Series EQ Module
E-05R 900 Series EQ Module
E-06R 900 Series EQ Module
E-07S 900 Series Low Pass-Filter Module
MT-S0601 Matching Transformer
A-2
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TOA E
LECTRONICS
, INC.
TEL: 800-733-7088
FAX: 800-733-9766
TOA C
ANADA
C
ORPORATION
TEL: 905-564-3570
F
AX
: 905-564-3569
© 2002, TOA Electronics, Inc.
Literature Order #: L-SPKRGUIDE
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