Atlas Sound XLTE, XLT User Manual
XLT / XLTE
XLT / XLTE
XLT / XLTE XLT / XLTE
FULL-RANGE SYSTEMS
FULL-RANGE SYSTEMS
FULL-RANGE SYSTEMSFULL-RANGE SYSTEMS
AND
AND
ANDAND
SUBWOOFERS
SUBWOOFERS
SUBWOOFERSSUBWOOFERS
Owner’s Manual
COMMUNITY PROFESSIONAL LOUDSPEAKERS
A TRADITION OF EXCELLENCE AND INNOVATION FOR OVER 30 YEARS
Before 1967, most sound reinforcement systems were made up of components designed for use in movie theaters.
Although these components worked well in theaters, the enclosures were large, bulky, heavy, and lacked output
capability in the critical midrange portion of the audio spectrum. This was very evident to a young audio engineer
named Bruce Howze, who was already involved in the fledgling touring sound industry, working with various rock
groups. He had a vision for a better way and, as a result, founded Community Light & Sound in 1967.
His concept was simple – design and build products that meet the needs of sound reinforcement with consistently
better products at a fair price. He also felt loudspeaker performance should be described in real-world terms.
Community is now well known as one of the only loudspeaker manufacturers to publish accurate, detailed, and
essentially raw performance data on its products using TEF™ measurements at realistic listening distances.
Community’s first product, dubbed the "LMF", was a fiberglass mid-bass horn for a 12 in. / 305 mm driver. It was
efficient, amazingly light, yet strong, making it ideal for touring use. Since then, Community has been distinctively
associated with fiberglass and with paying close attention to efficiency in converting electrical into acoustic energy.
Community continued to develop other unique products. The M4™ driver hit the market in 1981. This high power,
midrange compression driver covers the most critical portion of the audio spectrum – 200 Hz to 2000 Hz. This
removed the need for the usual crossover point right in the middle of the speech range. In keeping with not
designing “me too” products, the M4 diaphragm was made of thin aluminum skins sandwiching a structural foam
core – a fabrication technique still unique to Community. Recently the M4 has evolved with the development of a
nonpareil carbon fiber diaphragm virtually eliminating diaphragm failure. The M200™ midrange driver appeared 2
years after the M4 with an innovative diaphragm of aluminized mylar. Community has also demonstrated to the
world that big sound can come from small boxes, with the RS/VBS™ Series of electronically-controlled loudspeaker
systems that has now evolved into the Community Solutions™ series.
Most recently, Community has captured the audio world’s attention again with a number of innovative products: the
Leviathan II full-range horn system, the VHF100™ high frequency compression driver, the EM280™ and EM282™
extended midrange, carbon fiber diaphragm compression drivers. The EM282, M4, and VHF100 are the drivers used
in the revolutionary, forced-air cooled AirForce Concert System. With AirForce Community has, in a sense, come full
circle from the LMF, but this time with incomparable performance and hardware for a complete touring system.
Community’s History of Technological Firsts Include:
• First successful fiberglass MF / HF horns and giant fiberglass bass horns.
• First compression loaded midrange horn for touring systems – The LMF.
• First suspensionless diaphragm HF driver – VHF100.
• First midrange decade (200 Hz to 2 kHz) high power compression driver – M4.
• First carbon fiber diaphragm compression drivers – M4, EM280, EM282.
• First Ferrofluid-cooled professional woofers – VBS Series.
• First product series with all drivers Ferrofluid-cooled – SLS/SBS Series.
• First forced-air cooled drivers for touring system loudspeakers – AirForce.
• First passive loudspeakers with internal multi-band and multi-level processing – CSX-S2.
• First triaxial full-range horn system – Leviathan II.
• First sound reinforcement application of TDS (Time Delay Spectrometry) for signal-alignment – RS440.
• First integral signal-aligned 3-way sound reinforcement systems – RS Series.
• First TEF/TDS documented loudspeaker line – RS/V BS.
• First 3-way cinema systems – Paramount Exec. Theatre, Warner Bros. screening theatre/dubbing rooms.
• First electro-acoustic system to equal the sound level of pneumatic warning sirens.
• First to provide loudspeakers for sound coverage of an entire country – Denmark Emergency System.
• First comprehensive calibrated testing of sound reinforcement products.
• First to publish AudioCAD data on CD-ROM.
• First professional audio company with an Internet web site – http://www.loudspeakers.net
• First compact, weather-resistant, full-range horn systems - R2 Series.
• First custom configurable outdoor systems - WET Series
PAGE 1 Community XLT / XLTE S eries Owner’s Manual
EC STATEMENT OF CONFORMITY
This document confirms that the range of products of Community Professional Loudspeakers bearing the CE label meet
all the requirements in the EMC directive 89/336/EEC laid down by the Member States Council for adjustment of legal
requirements, furthermore the products comply to the rules and regulations referring to the electromagnetic
compatibility of devices from 30 A ugust 1995.
The Community Professional Loudspeaker products bearing the CE label comply with the following harmonized or
national standards:
DIN EN 55013:08-1991
DIN EN 55020:05-1995
DIN EN 50082-1:03-1993
The authorized declaration and compatibility certification resides with the manufacturer and can be viewed upon
request. The responsible manufacturer is the company:
Community Light & Sound, Inc.
333 East 5th Street
Chester, PA 19013
USA
Tel: 610 876-3400
Fax: 610 874-0190
e-mail: info@loudspeakers.net
Chester, PA USA Oct 1999
PAGE 2 Community XLT / XLTE S eries Owner’s Manual
TABLE OF CONTENTS
CHAPTER PAGE
Community Professional Loudspeakers..................................................................................................................... 1
EC Statement of Conformity..................................................................................................................................... 2
1. Introduction and Safety Information........................................................................................................... 4
1.2 Model Number Usage In This Manual........................................................................................................ 4
2. Unpacking and Inspection.......................................................................................................................... 5
!
!
3. Physical Features........................................................................................................................................ 9
4. Community XLT and XLTE Series General Description................................................................................11
4.1 Abbreviated Instructions.............................................................................................................................11
5. Setup and Operation..................................................................................................................................16
5.1 Choosing Power Amplification....................................................................................................................16
5.2 System Configurations...............................................................................................................................17
6. Electrical Installation ..................................................................................................................................20
6.4 Connection Diagra ms ................................................................................................................................23
7. Physical Installation....................................................................................................................................24
7.3 Mounting and Rig g i ng ................................................................................................................................25
7.6 Stacking Enclosures....................................................................................................................................28
8. Acoustical Adjustments..............................................................................................................................29
9. Operating Precautions................................................................................................................................32
10. Servicing the Loudspeaker..........................................................................................................................35
11. Technical Specifications .............................................................................................................................36
12. In Case of Difficulty....................................................................................................................................38
13. Warranty Information................................................................................................................................. 41
Appendix..................................................................................................................................................................43
Index ..................................................................................................................................................................44
Quick Start-up -- PASSIVE Mode or Subwoofer
Quick Start-up -- BIAMP Mode
................................................................................................................. 7
....................................................................................... 6
DIAGRAMS and TABLES PAGE
Fig 1: Physical Features........................................................................................................................................8
Fig 2: PASSIVE Mode Configurations....................................................................................................................18
Fig 3: BIAMP Mode Configurations......................................................................................................................19
Fig 4: Wiring for PASSIVE Mode...........................................................................................................................22
Fig 5: Wiring for BIAMP Mode.............................................................................................................................23
Fig 6: Wiring for Subwoofers...............................................................................................................................23
Fig 7: Mounting Point Detail – Pull Direction .......................................................................................................26
Fig 8: XLT M ounti ng Poi nts ..................................................................................................................................26
Fig 9: XLTE M ounti ng Points ................................................................................................................................27
Fig 10: XLTE Mounting / Rigg i ng Poi nt Deta il..........................................................................................................28
Fig 11: Effects of Amplifier Clipping.......................................................................................................................33
Fig 12: Sound Exposure Limits ...............................................................................................................................34
Table 1: Physical Features Matrix.............................................................................................................................9
Table 2: Product Listing...........................................................................................................................................11
Table 3: Recommended Amplifier Power for Full-Range in PASSIVE Mode...............................................................17
Table 4: Recommended Amplifier Power for Full-Range in BIAMP Mode..................................................................17
Table 5: Recommended Amplifier Power for Subwoofers ............................................................................. ............17
Table 6: Loudspeaker Wire Selection.......................................................................................................................20
Table 7: Minimum Impedance for two XLT or XLTE Loudspeakers in Parallel............................................................22
(Front Cover L to R: 51, 42, 41, 46, 47, 43, 55, 48. XLTE models shown.)
PAGE 3 Community XLT / XLTE S eries Owner’s Manual
COMMUNITY XLT™ AND XLTE™ SERIES OWNER’S MANUAL
1INTRODUCTION
Welcome! You’ve joined the group of people that have chosen high quality Community loudspeaker systems and
components for over 30 years. We’re gratified you did and we will do our best to make sure you are satisfied with
your new loudspeaker system.
In order for you to get the most effective use of this product, please take some time to read this manual. If you are in
a hurry and can’t wait, you can use the QUICK START-UP diagrams to connect your loudspeakers and be operating
them in few minutes. However, we have included a great deal of other useful information in this manual that will
help you to realize the best performance, operation, sound quality, and reliability from your new loudspeaker.
1.1 COMMUNITY XLT AND XLTE SERIES LOUDSPEAKER SYSTEMS
This manual contains information for the proper setup and operation of the Community XLT and XLTE full-range
loudspeaker systems and subwoofers. While every attempt has been made to ensure this information is correct and
up to date, Community continuously incorporates worthwhile improvements to each product that may include
changes and/or modifications not contained in this manual.
1.2 MODEL NUMBER USAGE IN THIS MANUAL
Within this manual XLT and XLTE models are generally referred to only by their numerical suffixes. For example,
model ‘43’ refers to both the XLT43 and XLT43E. Where information applies only to a specific model, such as only to
the XLT46 but not the XLT46E, the complete model number is used.
1.3 IMPORTANT SAFETY INFORMATION
The terms “Caution,” “Warning,” and “Danger” are used throughout this manual to alert the reader to important
safety considerations. If you have any questions about any aspects of these cautions, contact your local dealer,
distributor, or Community.
CAUTION:
to potential damage or danger.
WARNING:
injure the user.
DANGER:
extremely dangerous o r possibly life-threatening to the user.
describes an equipment operating condition or user action that may expose the equipment or user
describes an operating condition or user action that will likely cause damage to the equipment or
describes an operating condition or user action that will immediately damage the equipment or be
PAGE 4 Community XLT / XLTE S eries Owner’s Manual
2 UNPACKING AND INSPECTION
The Community XLT and XLTE loudspeakers are inherently rugged and are carefully pack ed in well-designed cartons.
It is a good idea to inspect the unit carefully after it has been removed from the packaging, as sometimes there is
hidden damage due to some unfortunate incident in shipment.
Please note that once the shipment has left Community, the responsibility for damage is borne by the freight
company. This means that if there is damage, you must file a claim with the freight company. Each freight company
has its own set of regulations that must be followed and forms that must be filled out. Therefore, the freight
company must be contacted as soon as a shipping damage problem is discovered. Save the carton and packing
material because many damage claims will be considered invalid if these are thrown away. The Community dealer
and the factory will try to help in any way possible. Remember, though, it is up to the party receiving the shipment
to file a damage claim.
It is always a good idea to keep the carton and packing material in case the unit must be shipped back to your dealer
or distributor.
The shipping carton contains the following items:
(1) Loudspeaker system
(1) Owner’s manual
(1) Warranty card
(1) Feet Kit (XLT41E only)
PAGE 5 Community XLT / XLTE S eries Owner’s Manual
NOTES: As shipped from the factory the PASSIVE/BIAMP switch is set for PASSIVE mode and the HF Level Switch
(not shown) is set in the +4 dB (maximum) position. Subwoofer input panel layout is different from that shown.
PAGE 6 Community XLT / XLTE S eries Owner’s Manual
NOTE: As shipped from the factory the PASSIVE/BIAMP switch is set for PASSIVE mode and
the HF Level Switch (not shown in this drawing) is set in the +4 dB (maximum) position.
PAGE 7 Community XLT / XLTE S eries Owner’s Manual
Figure 1: Physical Features
NOTE: These are composite, gener al ized drawings showing features for both XLT and XLTE products.
Refer to TABLE 1 to determine which of these features apply to your particular loudspeaker model.
PAGE 8 Community XLT / XLTE S eries Owner’s Manual
3PHYSICAL FEATURES
(See FIGURE 1)
3.1 FEATURES MATRIX
TABLE 1 lists various features that vary between XLT and XLTE models. Refer to the Features Descriptions chart in
SECTION 3.2 for details about each feature.
PHYSICAL FEATURES ENCLOSURE
MATERIAL FINISH GRILLE STYLE
XLT41
XLT43
XLT46
XLT47
XLT48
XLT51
XLT55
Mounting
Points
""""""
"" " " " "
"""""
"" " " " "
""""""
"""""
Stand
Adapter
Points
Rigging
Points
Protec-
Stand
Socket
tive
Corners Feet
""
OSB
Wood
13-ply
Baltic
Birch
Carpet
Finish
Paint
Finish
Flat
Grille
Beveled
Grille
XLT41E
XLT42E
XLT43E
XLT46E
XLT47E
XLT48E
XLT51E
XLT55E
"" " " " "
"" " " " "
"" " " " "
"""""
"" " " " "
"" " " " "
"""""
"""""
Table 1: Physical Features Matrix
3.2 FEATURES DESCRIPTIONS
This chart describes the physical features for XLT and XLTE. Because not all features apply to all models, refer to
FIGURE 1 and TABLE 1 Matrix to determine which features apply to which pr oducts.
MOUNTING POINTS DESCRIPTION
T-NUT MOUNTING POINTS
STAND ADAPTER MOUNTING POINTS
MOUNTING / RIGGING POINTS
STAND SOCKET
1 each on top, 2 sides, and bottom. 5/16-18 threaded inserts.
Used for perma nentl y mounti ng the loudspeaker.
2 on bottom. 5/16-18 threaded inserts that mate with Ultimate
Support™ stand adapter or similar.
3 on top and 3 on bottom. 3/8-16 captive nuts. WLL per point =
150 lb. / 68 kg vertical pull a nd 60 l b . / 27. 2 kg horizontal pull.
1-3/8 in. / 35 mm I.D. stand / pole socket for Ultima te Support or
similar stands or poles. On XLT51 and XLT51E the socket is used
for pole mounting a full -range loudspeaker.
2
1
3
PAGE 9 Community XLT / XLTE S eries Owner’s Manual
OTHER MOUNTING POINTS
GRILLE MOUNTING POINTS
INPUT PANELS
INPUT PANEL
POWERSENSE™ DDP 4 INDICATOR
HF LEVEL SWITCH
PASSIVE / BIAMP SWITCH
NEUTRIK SPEAKONS
11
DUAL 1/4 in. PHONE JACKS
12
NEUTRIK SPEAKONS
13
DUAL 1/4 in. PHONE JACKS
1/4 in. PHONE JACK – HIGH PASS OUTP UT
OTHER FEATURES
HANDLES
PROTECTIVE CORNERS
FEET
LOGO
The grille is fastened to the enclosure with
Phillips pan-head
screws.
1-1/2 in. / 38 mm #6
For connecting the power amp lifier to the loudspeak er. Also has
user adjustable controls and PowerSense protection indicator.
This LED indicator lights red whenever the PowerSense DDP
circuitry operates. It indicates the loudspeaker is bei ng ov erdriven.
A 2-position switch used to adjust the volume level of the high
frequencies for more (+4 d B ) or less (FLAT) output.
Used to select the loudspeaker’s operating mode. Down position
is for PASSIVE mode (single amplifier) and up position is for BIAMP
mode (separate LF and HF amplifiers).
Signal Input: 4 terminal NL4MP jacks. Accept NL4FC in-line
5
connectors. Used for both PASSIVE and BIAMP modes. Use
terminals #1 +/- for PASSIVE mode or for BIAMP LF input. Use
terminals #2 +/- for BIAMP HF input (not used for PASSIVE
mode). The two jacks are in parallel.
5
Signal Input. Accepts 1/4 in. tip/sleeve (2 conductor) phone plug.
Tip = +, Sleeve = -. U se ei ther ja ck f or PASSIVE mod e. Not used
for BIAMP mode. The two jacks are in parallel.
5
Subwoofer signal input. Neutrik NL4MP jacks accept NL4FC inline connectors. Use terminals #1 +/-. Terminals #2 +/- are not
used. The 2 jacks are in parallel and in parallel with 1/4 in. jacks
5
Subwoofer signal input. Accepts 1/4 in. tip/sleeve (2 conductor)
6
6
6
.
phone plug. Tip = +, Sleeve = -. The two jacks are i n parallel
and in parallel with the Neutrik jacks.
6
High-pass output (150 Hz and above) for connecting a full-rang e
loudspeaker when using a single amplifier to power both the
subwoofer and full - range loudspeak er.
Use only for carryi ng and handling - DO NOT U SE for mounting or
suspending the enclosure.
Protect the corners from da mag e, a ct as feet when the encl osur e i s
freestanding, and mesh with corners on other enclosures when
stacking so as to position and help stabilize the enclosure on top.
Heavy-duty rubber feet. Installed by user on the XLT41E.
Community logo recessed into grille.
Footnotes for Physical Features
1 Use ONLY for a horizontal pull direction, i.e. parallel to the enclosure surface where the insert is located.
:
CAUTION
2 These points are ONLY for supporting the loudspeaker from the bottom.
DANGER
3 Vertica l p ull is perpendicul ar to the enclosure surf a ce where the rigging p oi nt is located.
Horizontal pull is parallel to the enclosure surface where the rigging point is located.
CAUTION
4 DDP = Dynamic Dri v er Pr otection
5 Use either type of input jack - Neutrik or 1/4 in. Refer to SECTION 6.2 for further information.
6 An unused Neutr i k or 1/4 in. jack can b e used as a signa l output for parall el i ng to a 2nd loudspeak er .
Refer to SECTION 6.3 for further information.
Refer to SECTION 7.4 for further information.
:
These points are not intended nor load rated for suspending th e loudspeaker.
:
Refer to SECTION 7.5 for further information.
PAGE 10 Community XLT / XLTE S eries Owner’s Manual
4 COMMUNITY XLT™ AND XLTE™ SERIES GENERAL DESCRI PTI ON
The XLT loudspeaker systems have features and functions designed primarily for portable applications. The XLTE
systems are suitable for both heavier-duty portable use and for permanent installation. From the smallest to the
largest model, these loudspeakers represent Community’s commitment to meeting the audio requirements for sound
reinforcement with performance, quality, and reliability at affordable prices.
4.1 ABBREVIATED OPERATING INSTRUCTIONS
This General Description Chapter about the features and functions can serve as abbreviated operating instructions on
how to use your new product. More detailed information can be found in the chapters that follow.
4.2 MODELS (See Appendix for details about XLT41E and XLT48E model variations)
The full-range loudspeakers reproduce al l but the very deepest bass frequencies. The HF driver s (and MF driver in
the 46) are horn-loaded for maximum efficiency and for directional control of the sound. For additional bass output
at the extreme low end of t he audio frequency range, model 51 o r 55 subwoofers can be used with the full-range
loudspeakers to produce added depth and impact. The 51 and 55 subwoofers are ported (bass reflex) designs,
engineered to match the enclosure sizes and acoustic performance of the full-rang e l oudspeakers.
MODEL TYPE LOW FREQUENCY MID FREQUENCY
41 2-way floor monitor / PA (1) 12 in. / 305 mm N/A (1) 1 in. / 25 mm Titanium
1
42
43 2-way full-range (1) 15 in. / 381 mm N/A (1) 1 in. / 25 mm Titanium
46 3-way full-range (1) 15 in. / 381 mm (1) 6.5 in. / 165 mm) (1) 1 in. / 25 mm Titanium
47 2-way full-range (2) 15 in. / 381 mm N/A (1) 1 in. / 25 mm Titanium
48 2-way floor monitor (1) 15 in. / 381 mm N/ A (1) 1 i n. / 25 mm T i tanium
51 Ported subwoofer (1) 15 in. / 381 mm N/A N/A
55 Ported subwoofer (2) 15 in. / 381 mm N/A N/A
2-way full-range (1) 12 in. / 305 mm N/A (1) 1 in. / 25 mm Titanium
1 This model is only part of the XLTE Series.
2 2 in. / 51 mm diameter diaph r a g m , 1 in. / 25 mm exit driver on a 1 in. / 25 mm entr ance horn
HIGH FREQUENCY
2
Table 2: Product Listing
4.3 DRIVERS
All systems use proprietary drivers built to precise Community designs and specifications using the latest in materials
technology and design philosophy.
4.3.1 High Frequency Driver
The high frequency driver for all full-range systems is a 1 in. / 25 mm exit compression driver with a 2 in. / 51 mm
diameter titanium diaphragm. It provides high power handling capabilities while retaining the small diaphragm area
necessary to reproduce the small wavelengths of the highest audible frequencies.
4.3.2 Mid Frequency Driver (46 models only)
The midrange driver in the 46 models is a Ferrofluid cooled 6.5 in. / 165 mm horn loaded cone driver. Its long
excursion, low compression ratio design results in exceptionally low distortion. The large magnetic structure
provides high sensitivity along with high power handling that extends well below its 500 Hz crossover point.
4.3.3 Low Frequency Drivers
The low frequency drivers in all models are high sensitivity cone-type transducers. Their characteristics vary
depending on the particular loudspeaker model. Large magnetic structures, edge-wound voice coils, and high
stiffness-to-mass cones enhance power handling and clean reproduction. The enclosures are ported designs (also
called bass-reflex or vented) to improve low frequency efficiency and extend the low frequency response.
PAGE 11 Community XLT / XLTE S eries Owner’s Manual
4.3.4 Ferrofluid Cooling
All XLT and XLTE low frequency drivers and the 46 mid frequency driver are specifically designed to be Ferrofluidcooled. Ferrofluid is a viscous liquid that is attracted by magnetic fields. The liquid is injected into the voice coil gap
during manufacturing and is permanently retained by the magnetism in the gap. Precise Ferrofluid formulations are
used to match the particular physics of each driver’s operation. Ferrofluid provides several important benefits. It
transfers heat away from the voice coil to maximize power handling and improve reliability. Lower voice coil
operating temperatures also minimize power compression. (Power Compression: As voice coils heat up with higher
power input, their impedance goes up. The higher impedance means less power is deli vered to the loudspeaker,
thus "compressing” its output.) Ferrofluid also provides additional mechanical damping for the moving assembly,
thus lowering distortion, and helps keep the voice coil centered in its gap to prevent it from rubbing against the
magnet at high power inputs.
4.4 PATTERN CONTROL HORNS
The horn loading for the HF driver in all models and the model 46 MF driver is accomplished using precision molded
Pattern Control designs. In addition to providing high sensitivity, this ensures well-controlled, predictable horizontal
and vertical coverage throughout the driver’s operating range. Pattern Control technology projects articulate
transient response and high intelligibility over long distances. This is particularly true in difficult acoustic conditions
where focused sound helps prevent energizing room reverberation and the generation of unwanted sound
reflections.
4.5 INPUT PANEL
The steel signal-input panel on the rear of the enclosure (side on 41 and 48 models) has two Neutrik Speakon and
two 1/4 in. input jacks. All jacks are wired in parallel in PASSIVE mode, thus any one of them may be used to
connect to the amplifier. The panels also contain important printed information about the particular loudspeaker
including power rating, impedance, frequency response, and connector wiring. A PowerSense indicator is also
located on the input panel that will flash when the PowerSense DDP circuitry senses excessive power to the
loudspeaker.
4.6 INTERNAL CROSSOVER
The internal crossover is constructed of high quality components such as 250-Volt film capacitors, precision wound
inductors, high power resistors, and high-grade glass-epoxy circuit boards. The crossover and physical alignment of
the drivers within t he enclosure ensures that the acou s t ic outputs of the individual drivers combine smoothly.
4.6.1 PASSIVE / BIAMP Switch
A switch on the full-range loudspeaker input panel selects between two operating modes: PASSIVE mode (single
amplifier) or BIAMP mode (separate low and high frequency amplifiers). In both PASSIVE and BIAMP mode, the
internal crossover divides the audio signal into the separate frequency ranges for each of the drivers.
In PASSIVE mode one amplifier is used to power the entire loudspeaker. In BIAMP mode one amplifier is used to
power the low frequency section and another is used to power the high frequency section. The separation of high
and low frequencies is done internally in the loudspeaker, so no electronic crossover is required. Simply run
full-range signals into the amplifiers and connect the outputs to the appropriate HF and LF terminals on one of the
Neutrik input jacks. Use the amplifier input level controls to balance the HF to LF acoustic outputs. Note the 1/4 in.
jacks are not used in BIAMP mode.
4.6.2 HF-Level Switch
A switch on the full-range loudspeaker input panels selects between two different high frequency output levels. This
is used to adjust the voicing of the loudspeaker to optimize the audio quality for different performers, types of
program material, or acoustic environments. This switch is active in both PASSIVE and BIAMP modes.
PAGE 12 Community XLT / XLTE S eries Owner’s Manual
4.6.3 Subwoofer Full-Range Output
The subwoofers have a FULL-RANGE OUTPUT designed to connect to a full-range loudspeaker. This output
functions as a high pass filter. The signal from the power amplifier connected to the subwoofer passes through this
output that filters out the subwoofer frequencies below 150 Hz, and provides the signal for powering the full-range
loudspeaker. This is so a single amplifier channel can be used to power both the subwoofer and full-range
loudspeaker. (See SECTION 5.1.2 for amplifier load impedances.) For more exacting control of the volume balance
between the subwoofer and full-range loudspeaker, separate amplifier channels can be used to power each
individually.
4.6.4 PowerSense™ DDP Circuit
All crossovers have PowerSense DDP (Dynamic Driver Protection) circuitry that automatically provides thermal and
over-current protection for the both the HF driver and the overall loudspeaker. This circuitry senses the power
delivered to the loudspeaker. If it exceeds a point that could damage any of the driver s, PowerSense automatical ly
reduces the power to the dri ver or to the ov erall l oudspeaker . Assumin g an ampli fier of appr opriat e size is u sed, t he
PowerSense DDP circuit provides a high degree of protection against loudspeaker damage. This proprietary circuitry
helps ensure that your loudspeaker will not only keep on performing but keep on performing at its best. PowerSense
is active in both PASSIVE and BIAMP modes.
4.6.5 PowerSense Indicators
A red PowerSense LED located on the input panel in the back of the loudspeaker will flash anytime the PowerSense
DDP circuitry senses excessive power to the loudspeaker. In BIAMP mode the LED will only indicate excessive
power for the HF. Light flashes will also be seen through the bass ports from the front of the loudspeaker for either
HF or LF overdrive in both PASSIVE and BIAMP modes.
4.7 POWER HANDLING
The power ratings in the specifications define the maximum power that can be used for each model. The Program
Power rating is the recommended size of the power amplifier to be used with the loudspeaker. The Program rating
takes into account that there are momentary transient or peak sounds in the audio signal, such as from percussion
instruments. Normally, the loudspeaker can easily handle these peaks so an amplifier equal to the Program rating
provides the extra power needed to reproduce them. The RMS (or continuous) rating is the safe amount of sustained
power that the loudspeaker can handle, such as might occur with a sustained single note or chord from a synthesizer.
4.8 ENCLOSURES
XLT:
These enclosures are constructed of OSB (Oriented Strand Board). This wood is a type of composite board
specially constructed with the wood grains oriented in one direction. This results in a much stronger material for a
given weight than other types of composite wood materials.
XLTE:
These enclosures are constructed of 13-ply Baltic birch plywood. Although more expensive than composite
woods, various types of birch plywood are used for the enclosures of almost all top-quality professional loudspeakers
because of its strength, toughness, and inert acoustic properties.
All XLT and XLTE models have extensive internal bracing, making an extremely strong enclosure that will not resonate
or flex, even at maximum bass out put. Except for the 4 1, 48 , and 5 1 , all en clo sur es are tr apezoi dal. The tr apezoi dal
shape facilitates arraying of multiple enclosures. This shape also allows placement in tight spaces often encountered
in both portable situations and permanent installations.
PAGE 13 Community XLT / XLTE S eries Owner’s Manual
4.8.1 Permanent Mounting
Each enclosure has provisions for permanently installing it.
XLT:
These models have four 5/16-18 threaded T-nuts - one each in the top, sides, and bottom. The XLT48 has two
mounting points - one on each of the two sides. These points are designed to be used with Community’s optional
CSSUPKIT or WB1 mounting kits for permanent installations. The XLT41E has no provisions for permanent mounting
or rigging.
XLTE:
These models have six engineered, load-rated 3/8-16 mounting rigging points - three each on the top and
bottom of the enclosures. The XLT48E has the same provision as the XLT48 - two mounting points - one on each of
the two sides. The XLT41E has no provision for permanent mounting or rigging
4.8.2 Corner Protectors and Stacking (XLT only)
The XLT enclosures have eight corner protectors on the corners of the enclosures. They serve as feet for the
enclosure as well as providing pro tection from physical damage. They are design ed with ridges in them that mesh
with the corners of other XLT enclosures with the same footprint so that they can be easily stacked.
4.8.3 Feet (XLTE only)
Each XLTE enclosure, except the XLT41E, comes with four heav y-duty rubber feet attached in to slight recesses in the
enclosure. The XLT55E al so has recesses in the top of its enclosure that mate wi th the feet of the XLTE full-range
enclosures when stackin g.
The feet on the XLT41E are supplied unattached. They can be attached t o either of the rear surfaces or the botto m of
the enclosure depending upon the application. Pilot holes for locating and attaching the feet are provided on the rear
surfaces, for monitor applications, and on the bottom, for upright PA use.
WARNING:
Refer to SECTION 7.6 for information on stacking enclosures.
4.8.4 Carrying Handles
Each enclosure has recessed bar handles mounted near the center of gravity for easier lifting. The handles are an allsteel construction to help prevent breakage. The XLT41E has a steel spring handle.
DANGER:
Do not use the handles for mounting or hanging (suspending) the loudspeaker. The handles are not designed for nor
load rated for these purposes.
4.8.5 Stand / Pole Mounting
The 41, 42, and 43 models have a 1-3/8 in. / 51 mm socket in the bottom that mates to appropriate Ultimate Support
or similar stands or poles. The 46 and 48 models have 5/16-18 T-nuts for attaching an external stand / pole mount
adapter. The 51 has a pole socket in its top for pole mounting a full-range loudspeaker above it such as an XLT41,
XLT41E or XLT42E. The Community SB5 pole accessory can be used for this purpose. (See SECTION 4.9.1)
PAGE 14 Community XLT / XLTE S eries Owner’s Manual
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