Bose FreeSpace DS 40F



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Bose FreeSpace DS 40F

Bose FreeSpace DS 40F ceiling-mount loudspeaker (Product Code 321278-0131 black, 321278-0231 white)

Bose FreeSpace DS 40F, versatile, high-performance, full-range, flush-mount loudspeaker designed for foreground and background music and speech reproduction in a wide range of installed applications. High output and 125° conical pattern with a frequency range down to 70 Hz.

For indoor applications only.

EN 54-24 compliant DS loudspeaker models are also available for use in Voice Alarm (VA) systems. Please contact your local Bose team for availability information.

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 pendant-mount 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

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 lowimpedance 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 Summary

Frequency Response (+/-3 dB)
80 Hz – 17 kHz

Frequency Range (-10 dB)
70 Hz – 19 kHz

Nominal Dispersion
125° conical

Long-Term Power Handling
40 W (160 W peak)

Sensitivity (SPL / 1 W @ 1 m)
87 dB SPL

Maximum SPL @ 1 m
103 dB SPL (109 dB SPL peak)

Nominal Impedance
8 Ω (transformer bypassed)

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