U4-Sub : Multipurpose Subwoofer.

High Output Dual 18" Multipurpose Subwoofer

U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Size Comparison
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Photo
U4-Sub Size Comparison

Double 18" ultra low distortion woofer, very high power handling of 2500 W, extended low frequency reproduction

  • The U4 is a double 18" high output subwoofer that provides powerful and extended low frequency response with immense headroom. Low port compression and optimized enclosure design give a tight, accurate bass response that is ideally suited for dance clubs, mobile and installation applications.

Main Features

  • 2x 18″ ultra low distortion drivers
  • Extended frequency response down to 30 Hz
  • System integration with CODA LiNUS amplifiers
  • Maximum SPL 144 dB (peak)
  • Low power compression

This post is also available in: Deutsch (German)

The U4 is equipped with twin extremely long excursion 18″ ultra low distortion woofers. The strong motor delivers extreme high magnetic flux for increased efficiency. The 4″ voice coil is 32 mm high, ensuring ultra linear excursion of 20 mm / pp at consistent magnetic force.

The state-of-the-art carbon-fiber cone ensures maximum stiffness and low moving mass. Three aluminum shorting rings reduce intermodulation distortion, minimising induction variation whilst reducing thermal compression. This design dramatically reduces the distortion of a typical subwoofer at longer excursion levels, and improves the overall sound quality and performance characteristics of the cabinet.

The U4 is designed to work exclusively with CODA Audio LINUS amplifiers as an integrated solution for DSP control, amplification, network remote control and diagnostic.
The integrated solution ensures optimal performance and protection.

The U4 is perfectly suited as a sub-extension for G-Series, D-Series, CUE-Series and TiRAY, extending the system performance down to 30 Hz. Typical applications are Dance Clubs, Theatres, Houses of Worship and Live sound Venues.




Type: High Output Dual 18″ Multipurpose Subwoofer
Application: Medium / large venues subwoofer
Frequency response (-6 dB): 30 Hz – 150 Hz
Power handling (AES/peak): 2500 W / 10000 W
Sensitivity 1 W / 1 m:* 104 dB
Maximum output peak:** 144 dB
Amplification, Cabinets per Amplifier:
LINUS10-C Optimum / Maximum: 4/4
LINUS14D Optimum / Maximum: 4/4
LINUS10 Optimum / Maximum: 2/4
Components: 2x 18″ ultra low distortion woofers, 4″ (101.6 mm) voice coil, 1250 W (AES) each
Nominal impedance: 4 Ohm (+1/-1)
Input connectors: 2x Neutrik™ NL4MP
Suspension: N/A
Enclosure material: Birch plywood
Finish: Polyurea coating
IP rating (IEC 60529): IP54
Weather protection options: Standard IP55: IP55 (direct cable)
MG1 (Marine Grade 1): IP55
Dimensions (WxHxD): 1108 x 497 x 750 mm / 43.62 x 19.57 x 29.53″
Net weight: 77 kg / 169.76 lbs

* Half space loading.
** Measured with pink noice 6 dB crest factor.


  • DOT-U4

    This post is also available in: Deutsch (German)

    Transport dolly for up to 3x U4


U4 Data SheetDownload 
U4 CAD Drawing 2DDownload 
U4 CAD Drawing 3DDownload 
DOT-U4 CAD Drawing 2DDownload 
CODA Audio Weather Protection Download 

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