FreeSpace® DS 40F
loudspeaker
Key Features
• Full-range loudspeaker with a single 4.5" (114 mm) driver in a ported
enclosure to deliver a 125° conical coverage pattern and clear,
intelligible music and speech reproduction for flush-ceiling or pendantmount applications
• Integrated multi-tap transformer with innovative thumb wheel
adjustment for easy-to-change tap setting from underneath the
loudspeaker grille
• Shortcan design allows installation in shallower ceilings with minimum
depth of 6.4" (163 mm)
• Shared voicing across entire FreeSpace DS product family enables
DS 16, DS 40 and DS 100 loudspeakers to be integrated on the same
system and maintain consistent tonal quality
• Supported by a suite of accessories, including ceiling-mount bracket,
adjustable tile bridge, pendant-mount kit and square grille
Product Overview
The Bose® FreeSpace DS 40F is the most versatile member of the DS loudspeaker family. It is a high-performance, full-range, flushmount loudspeaker designed for foreground and background music and speech reproduction in a wide range of installed applications.
The DS 40F features high output and 125° conical pattern with a frequency range down to 70 Hz.
TECHNICAL DATA SHEET
Technical Specifications
System Performance
Frequency Response (+/-3 dB)
Frequency Range (-10 dB)
Nominal Dispersion 125° conical
Recommended High-Pass Filter 70 Hz high-pass filter
Loudspeaker EQ Recommended
Overload Protection PTC/Resistor
Long-Term Power Handling
Sensitivity (SPL / 1 W @ 1 m)
Maximum SPL @ 1 m
Nominal Impedance 8 Ω (transformer bypassed)
Transformer Taps (70/100 V) 70 V: 2.5 W, 5 W, 10 W, 20 W, 40 W
Transducers
Driver Compliment 4.5" (114 mm) full-range driver
Physical
Enclosure Polypropylene (front baffle), powder-coated steel (rear enclosure)
Grille Powder-coated steel grille
Environmental Indoor use only
Connectors Three-terminal barrier strip; two-terminal barrier strip (8 ohm variant). Optional accessory available for use when ceramic connector and thermal
Suspension / Mounting Three integrated quick-install mounting arms. Three mounting points at the rear of the enclosure for use with optional accessory pendant mount
Dimensions Outer flange diameter: 11.8" (300 mm)
Ceiling Thickness (Maximum) 2.5" (64 mm)
Net Weight
Shipping Weight
Product Code
Black
White
Footnotes:
1 Frequency response and range measured on-axis with recommended active EQ in an anechoic environment.
2 Power handling tested using pink noise filtered to meet IEC 268-5, 6 dB crest factor, 100 hours, with recommended EQ.
3 Sensitivity measured in free field (no boundary-loading gain) with recommended active EQ, referenced to 1W/1m.
4 Maximum SPL calculated from sensitivity and power handling specifications, exclusive of power compression.
1
1
2
3
4
80 Hz - 17 kHz
70 Hz - 19 kHz
40 W (160 W peak)
87 dB SPL
103 dB SPL (109 dB SPL peak)
100 V: 5 W, 10 W, 20 W, 40 W
fuse are required. Wire gauge: 18 AWG (0.8 mm) to 14 AWG (2.0 mm)
kit. Safety cable attachment: .35" (8.9 mm) diameter hole on junction box
Depth: 6.0" (153 mm)
Ceiling hole diameter: 10.5" (267 mm)
8.3 lb (3.7 kg) - with transformer 6.3 lb (2.8 kg) - 8 Ω variant
11.0 lb (5.0 kg) - with transformer 9.0 lb (4.1 kg) - 8 Ω variant
321278-0130 - with transformer 321278-0140 - 8 Ω variant
321278-0230 - with transformer 321278-0240 - 8 Ω variant
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FreeSpace® DS 40F
loudspeaker
Directivity Index and Q
Beamwidth
TECHNICAL DATA SHEET
Impedance
On-Axis Response
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FreeSpace® DS 40F
loudspeaker
Tap Chart
Mechanical Diagrams
TECHNICAL DATA SHEET
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FreeSpace® DS 40F
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Horizontal Plots
TECHNICAL DATA SHEET
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FreeSpace® DS 40F
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Vertical Plots
TECHNICAL DATA SHEET
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FreeSpace® DS 40F
loudspeaker
Architects’ and Engineers’
Specifications
The loudspeaker shall be a 40 watt, ported loudspeaker system
utilizing one 4.5" (114 mm) full-range HVC (Helical Voice Coil)
driver. The loudspeaker shall be designed for installation in
ceilings up to 26 ft (8 m) high. An optional pendant-mount
accessory allows the loudspeaker to be hung from open ceilings.
The loudspeaker shall have a nominal rated impedance of 8 ohms
and shall be wired in parallel with a line voltage matching (stepdown) transformer with a level selector appropriate for various
output taps. The loudspeaker input connections will allow for
direct connection to 70 volt, 100 volt or low-impedance amplifiers.
An 8 ohm variant of the loudspeaker shall be available without a
transformer for low-impedance applications only.
The loudspeaker shall have a protection circuit to protect the
product from occasionally being overdriven. Each loudspeaker
shall have a bandwidth of 80 Hz – 17 kHz and a maximum
continuous acoustic output of 103 dB SPL referenced to a full
bandwidth pink noise input at 1 meter at the loudspeaker’s rated
power. The input connection shall consist of a three-terminal
barrier strip. The input connection of the 8 ohm variant of the
loudspeaker shall consist of a two-terminal barrier strip.
Power settings available shall be: 2.5, 5, 10, 20, and 40 watts
at 70 volts; 5, 10, 20, and 40 watts at 100 volts; and 40 watts
at 8 ohms (when referenced to IEC noise for 100 hours). The
nominal dispersion shall be 125° conical coverage pattern at -6
dB (average 1 – 4 kHz).
The loudspeaker shall be plenum-rated for use in air handling
spaces. The loudspeaker shall meet numerous standards for
combination music and evacuation systems around the world.
Exposed cosmetic surfaces of the loudspeaker shall be paintable,
and the acoustically transparent grille component shall be formed
of powder-coated steel.
The loudspeaker shall be the Bose® FreeSpace® DS 40F
loudspeaker.
TECHNICAL DATA SHEET
Safety and Regulatory
Compliance
The FreeSpace® DS 40F loudspeaker and FreeSpace DS
40F loudspeaker – 8 Ohm have passed extensive testing
and comply with the following specifications and uses:
Listed to ANSI/UL 1480-2005
• Fire Protective Signaling Use – UL Category UUMW, File
Number S 3241. Control Number 42S9.Not for use with
DC-supervised systems.
• General-Purpose Use – UL Category UEAY, File Number
S 5591 Control Number 3N89.
• Suitable for use indoors in damp locations.
• Suitable for installation using Class 1, Class 2 or Class
3 wiring methods in accordance with NFPA 70, National
Electric Code, 2008, Article 640.
• Suitable for use with fire alarm circuit wiring methods in
accordance with NFPA 70, National Electric Code, 2008,
Article 760.
• Suitable for use in air handling (plenum) spaces.
• UL-2043, Fire Test and Visible Smoke Release for
Discrete Products and their Accessories Installed in Air
Handling Spaces.
• NFPA 70, National Electric Code, 2008, Article 300-22 (c).
• NFPA 90-A, 2008, Installation of Air Conditioning and
Ventilation Systems, Paragraph 4.3.11.2.6.5.
The DS 40F loudspeaker and DS 40F loudspeaker – 8 Ohm
have been designed to the requirements defined in the
following European regulatory specification for combination
systems when installed with an accessory ceramic terminal
and thermal fuse:
Bose Professional Systems Division
• British Standard Code of Practice BS 5839, Part 8.
• Tested to IEC 60268-5.
All information subject to change without notice.
All trademarks are those of their respective owners.
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