Biamp Desono™ CM30DTD Two-Way 4.25" Ceiling Loudspeaker – Clear Audio for PA & Background Music
The Desono CM30DTD is a high-performance two-way 4.25-inch ceiling loudspeaker designed to deliver crystal-clear audio for public address and background music applications. Featuring a polypropylene woofer and a 1-inch tweeter, it offers high sound pressure levels (SPL) with extremely low distortion, ensuring exceptional clarity across the entire frequency range.
Equipped with a 5-position switchable transformer (1.75W to 30W) and a low-impedance bypass, the CM30DTD supports constant-voltage operation, making it ideal for large areas requiring background music and paging. Its installer-friendly design allows blind mounting from below the ceiling, with a magnetically attached, thin-edge grille for easy, toolless installation and removal. The grille can also be painted to match room decor.
Conveniently, the tap switch is located on the speaker’s faceplate, enabling power adjustments without accessing the ceiling. Designed to meet rigorous safety and performance standards, including Zoom Rooms certification and ETL listings, the CM30DTD offers reliable, high-quality sound in conference rooms, hallways, training rooms, offices, and more.
Applications
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Conference Rooms
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Hallways
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Training Rooms
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Multipurpose Rooms
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Lunch Rooms
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Manufacturing Areas
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Offices
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Waiting Rooms
Key Features
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Zoom Rooms Certified for seamless conferencing integration
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Compact 5.2-inch (131 mm) mounting depth
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High speech intelligibility and full-range music reproduction
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Thin-edge, magnetically attached grille for easy toolless installation
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5-position tap switch for 70V/100V or 16Ω low impedance operation
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Tuned bass reflex port optimizes low-frequency performance
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Overload protection ensures 24/7 failsafe operation
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Suitable for air handling spaces per NFPA 70 and NFPA 90
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Complies with City of Chicago codes
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ETL listed to UL Std 1480A and UL 2043; certified to CSA C22.2#62368-1
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Backed by a 5-year warranty
Biamp Desono CM30DTD Specifications
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GENERAL
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Diameter
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8.8 inches (223 mm)
Cutout Diameter: 7.6 inches (193 mm)
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Weight
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5.5 lbs (2.5 kg)
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Mounting
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Mounting Provisions: 2 mounting clamps with grip range of 0.2" - 2.6" (3 - 65 mm); Cover plate with 0.75" (22 mm) NPT knockout for conduit connectors
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Accessories
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Included Accessories: Tile rails; tile rail spacers; cutout template
Optional Accessories: SQGR square grille
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ENVIRONMENTAL
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Operating Environment
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Indoor
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POWER
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Power
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Continuous Power Handling @ Nominal Impedance: 28V 50W @ 16Ω (200W peak)
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LOUDSPEAKER
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Loudspeaker System
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Protection: 3-step self-resetting protectionTransducers: LF: 1 x 4.25" (108 mm) treated paper cone, HF: 1 x 1" (25 mm) soft dome
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Operating Mode
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Passive
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Operating Range
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90 Hz to 22 kHz
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Beamwidth
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Nominal Beamwidth (H x V): 120° conical
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Transformer
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Transformer Taps - 70V: 30W, 15W, 7.5W, 3.75W, 1.75W
Transformer Taps - 100V: 30W, 15W, 7.5W, 3.75W
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Sensitivity
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Nominal Sensitivity @ 1m: @ 1W 87 dB @ 2.83V 83 dB
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AUDIO
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Input Type
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Input Connection: (1) 4-way Euroblock connector with permanent pass-through
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SPL
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Nominal Maximum SPL @ 1m: Peak 110 dB Continuous 104 dB
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CERTIFIED SOLUTIONS
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Zoom
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Zoom Certified
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COMPLIANCE
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Certifications
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ETL listed to comply with UL 1480A and UL 2043;
Certified to CSA C22.2#62368-1;
Suitable for use in air handling spaces per NFPA 70, NFPA 90
Conforms with City of Chicago Codes
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Safety Features
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2 hang points
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