Biamp Cambridge DS1339W

Direct-field sound masking loudspeaker engineered for plenum installation, delivering uniform, low-level background sound to enhance speech privacy and reduce distractions in open offices, healthcare facilities, and commercial spaces. Its 4-inch full-range driver produces a smooth frequency response from 100 Hz to 10 kHz with a wide 170° conical coverage, while the 8-ohm impedance and 10 W RMS power handling ensure compatibility with standard 70V/100V systems via transformer (not included) or low-impedance amplifiers. The white ABS baffle and steel backcan blend seamlessly into suspended ceilings, and the included tile bridge and T-bar clips simplify mounting.

Advantages

This loudspeaker is part of the Biamp Cambridge QtPro sound masking ecosystem, known for precise spectral shaping and consistent output. Its plenum-rated (UL 2043) construction meets strict fire safety codes, allowing direct installation in air-handling spaces without additional enclosures. The 2-pin Phoenix connector provides secure, tool-free wiring, and the perforated steel grille protects the driver while maintaining acoustic transparency. With a maximum SPL of 92 dB at 1 meter, it delivers ample output for masking systems without distortion.

Suitable for

• Open-plan offices requiring speech privacy and reduced noise distraction
• Healthcare environments where patient confidentiality is critical
• Call centers and financial institutions needing acoustic comfort
• Conference rooms and legal offices for confidential discussions
• Any commercial space with suspended ceiling grids

Key specifications

• Driver: 4-inch (100 mm) full-range, paper cone with rubber surround
• Frequency response: 100 Hz – 10 kHz (±3 dB)
• Nominal impedance: 8 ohms
• Power handling: 10 W RMS, 20 W program
• Sensitivity: 88 dB (1W/1m), max SPL 92 dB (1m)
• Coverage: 170° conical (direct field)
• Connector: 2-pin Phoenix screw terminal (accepts up to 14 AWG)
• Enclosure: 22-gauge steel backcan, ABS baffle, white finish
• Grille: Perforated steel, white powder-coated
• Mounting: T-bar clip and tile bridge included; fits 24" or 600 mm ceiling grids
• Certifications: UL 2043 plenum rated, CE, RoHS compliant
• Environmental: Indoor use only; 0°C to 40°C, 10% to 90% RH non-condensing
• Dimensions: 7.9" diameter x 5.5" depth (200 mm x 140 mm); weight 2.2 lbs (1.0 kg)
• Compatibility: Biamp Cambridge QtPro, Dynasound, and other masking controllers

Recommendations

For optimal performance, pair with a Biamp QtPro control module and use the recommended equalization curve. Space units 10–15 feet apart in a grid pattern to achieve uniform masking field. Ensure the backcan is properly sealed to prevent sound leakage into the plenum. Always verify local building codes for plenum-rated devices.