High-Fidelity Commercial Ceiling Speaker for Paging & Music

The SoundTube CM400i is a premium 4-inch in-ceiling speaker engineered for background and mid-level sound applications in commercial audio systems. Designed to deliver consistent coverage and excellent intelligibility, it provides clear music reproduction and reliable paging performance across a wide listening area.

Featuring a polypropylene woofer and convex aluminum tweeter with FerroFluid cooling, the CM400i produces smooth highs and effective low-frequency response down to 75 Hz (-10 dB). Its optimized off-axis performance ensures uniform audio coverage — essential for distributed speaker systems in public spaces.

Flexible 70V / 100V System Integration

The CM400i supports multiple distributed audio configurations with a five-position tap switch and transformer bypass. Installers can easily configure the speaker for:

  • 25V systems

  • 70.7V systems

  • 100V systems

  • Low-impedance bypass operation

This flexibility makes it suitable for both new installations and retrofit upgrades.

Fast & Secure Installation

SoundTube’s SpeedWing™ constant-tension mounting system allows quick blind-mount installation while securely fitting a wide range of ceiling materials.

  • Fits ceiling thickness: 0.025" – 1.87" (0.6–47.5 mm)

  • Magnetic, tool-free grille

  • Low-profile bezel for clean appearance

  • Paintable grille and bezel

Installers can complete installations quickly while maintaining a professional finished look.

Built for Commercial Reliability

The CM400i is designed for continuous operation in demanding environments. UL safety certifications and durable construction make it suitable for long-term installed sound systems.

SoundTube CM400i Key Features

  • 4" polypropylene woofer with 1" aluminum tweeter

  • FerroFluid cooled high-frequency driver

  • 90 dB sensitivity for efficient output

  • Low-profile magnetic grille (paintable)

  • SpeedWing™ fixed-wing mounting system

  • 5-position tap switch with transformer bypass

  • Supports 25V, 70.7V, and 100V distributed systems

  • Powder-coated steel grille

  • UL 1480 & UL 2043 listed

Included Accessories

  • Tile bridge (color-coded)

  • Paint mask

  • Euroblock connector

  • UL cover plate

Ideal Applications

Perfect for distributed audio and paging systems in:

  • Schools & universities

  • Retail stores & grocery stores

  • Restaurants & hospitality venues

  • Hospitals & medical offices

  • Conference rooms & offices

  • Houses of worship

  • Museums & public buildings

Expand Low-Frequency Performance

For enhanced bass response in music systems, the CM400i pairs well with distributed subwoofers in larger installations.

Specifications Section — SoundTube CM400i

Technical Specifications

Speaker Type
2-way in-ceiling commercial speaker

Driver Components
4" polypropylene woofer
1" convex aluminum tweeter with FerroFluid cooling

Frequency Response
75 Hz – 20 kHz (-10 dB)

Sensitivity
90 dB average

Coverage Angle
Wide dispersion optimized for distributed audio systems

Power Taps (Transformer)
25V / 70.7V / 100V selectable
Transformer bypass (low-impedance mode)

Mounting System
SpeedWing™ constant-tension blind mount

Grille
Magnetic, paintable, powder-coated steel

Certifications
UL 1480 (UEAY)
UL 2043 plenum rated

Included Accessories
Tile bridge
Paint mask
Euroblock connector
UL cover plate

Applications
Paging and background music systems

List price: $290.00
Price: $290.00
SKU: CM400I
Catalog: 
Ceiling Speakers
Brand: 
Soundtube
Dimensions: 10 in × 10 in × 10 in
Weight: 8 lb