SoundTube CM890i 8-Inch High‑Power Coaxial In‑Ceiling Speaker

The CM890i is a high‑output 8″ 2‑way coaxial in‑ceiling speaker engineered for sound reinforcement, public address, and high‑SPL applications. Available in black or white with magnetic, paintable steel grille and bezel assembly.

Featuring patented BroadBeamHP™ waveguide technology, a cast‑aluminum compression driver, and a treated‑fiber woofer, it offers edge‑to‑edge coverage and exceptional clarity. The SpeedWing mounting system attaches to ceiling thicknesses from 0.25″ to 1.91″, and a six‑position rotary transformer tap switch (with bypass for 8 Ω direct) enables flexible configuration.

Ideal for gyms, arenas, convention centers, airports, and other high-demand venues where consistent full-range audio and intelligibility are required.

Key Features

• Color Options: Black or White paintable magnetic grille
• Drivers: 8″ treated-fiber woofer w/ cloth surround; 1.42″ titanium compression driver
• Dispersion Technology: BroadBeamHP™ constant-directivity waveguide (~80° @ 2 kHz)
• Mounting System: SpeedWing™ constant-tension wings for 0.25″–1.91″ ceilings
• Transformer Tap: Six-position rotary switch for 25 V, 70.7 V, 100 V or 8 Ω direct
• Sensitivity: ~93 dB @ 1 W/1 m (also @ 2.83 V/1 m)
• Power Handling: 125 W RMS continuous; 250 W program output
• Frequency Response: 80 Hz–22 kHz (±3 dB); 62 Hz–22 kHz (±10 dB)
• Cutout Diameter: 12.75″
• Certifications: UL 1480, UL 2043, CE, RoHS
• Included Accessories: Tile bridge, conduit plate, Euroblock connector, paint mask

Technical Specifications

• Woofer: 8″ (203 mm) treated fiber cone, cloth surround
• Tweeter: 1.42″ (36 mm) titanium compression driver w/ waveguide
• Crossover Frequency: ~2.2 kHz, 12 dB/octave second order
• Nominal Impedance: 8 Ω
• Minimum Impedance: ~5.2 Ω
• Directivity Factor (Q): 4.4 (avg 100 Hz–10 kHz), 5.5 @ 2 kHz
• Directivity Index (DI): 7.4 dB (avg), 5.5 dB @ 2 kHz
• Backcan Dimensions: 11.68″ diameter × 7.94″ depth (296.7 × 201.7 mm)
• Visible Dimensions: 14.76″ diameter × 1.08″ grille (374.9 × 27.4 mm)
• Cutout Diameter: 12.75″ (323.9 mm)

Estimated Package

• Shipping Weight (per unit): ~21.3 lbs (9.7 kg)
• Package Dimensions: ≈ 19″ × 14″ × 15″ (48.3 × 35.6 × 38.1 cm)

What's Included

• Magnetic steel grille & bezel (Black or White)
• Tile bridge
• Conduit plate
• Euroblock connector
• Paint mask / installation aid