SoundTube CM400i 4-Inch Coaxial In‑Ceiling Speaker

The SoundTube CM400i is a two-way coaxial in‑ceiling speaker housing a 4″ polypropylene woofer with butyl rubber surround and a 1″ convex aluminum tweeter with ferrofluid cooling. Its BroadBeam® waveguide delivers wide-dispersion sound ideal for commercial environments. A five‑position tap switch supports 25 V, 70.7 V, 100 V transformer taps or low‑impedance bypass.

Installation is fast with SpeedWing™ blind-mount hardware suitable for ceilings 0.6–47.5 mm thick. Includes magnetic paintable steel grille—available in Black or White—plus accessories such as tile bridge or pre-construction bracket.

Both finish options share identical specifications and certification, making this speaker flexible for aesthetic-sensitive installations without sacrificing performance or functionality.

Key Features

• Drivers: 4″ polypropylene woofer; 1″ convex aluminum tweeter with ferrofluid cooling
• Dispersion: BroadBeam® waveguide for wide coverage
• Tap Switch: 25 V / 70.7 V / 100 V (2.5, 5, 10, 20 W) or transformer bypass (4 Ω)
• Power Handling: 20 W RMS continuous; 40 W program power
• Sensitivity: 87 dB @ 1 W/1 m; 90 dB @ 2.83 V/1 m
• Frequency Response: 90 Hz–22 kHz (–3 dB); 75 Hz–22 kHz (–10 dB)
• Maximum SPL: 100 dB @ 1 m
• Coverage Angle: ~100° @ 2 kHz; ~65° @ 10 kHz; ~95° averaged 2–10 kHz
• Mounting Depth: 7.68″; Cutout ∅: 6.6″
• Installation: SpeedWing™ fixed-wing blind-mount system
• Grille: Magnetic, powder-coated steel; paintable; color: Black or White
• Certifications: UL 1480A; UL 2043; CE; RoHS
• Included Accessories: Euroblock connector, paint mask, UL cover plate, tile bridge or pre‑construction bracket

Technical Specifications

• Nominal Impedance: 4 Ω
• Directivity Factor (Q): ~4.6 (avg), ~4.3 @ 2 kHz
• Directivity Index (DI): ~5.6 dB (avg), ~6.3 dB @ 2 kHz
• Crossover Frequency: 1.8 kHz (12 dB/octave)
• Enclosure Volume: ~104 cu in (1,704 cm³)
• Weight (Speaker): 5.5 lb (2.5 kg)
• Shipping Weight: 7.25 lb (3.29 kg)
• Carton Dimensions: 10″ × 10″ × 9.25″