CBM-U4

A universal interrupt switcher designed for vehicles having an aftermarket stereo with a 2 or 4 speaker system

The CBM-U4 is similiar in price to an external speaker, but with far more benefits. An external speaker does NOT mute the stereo or automatically switch to vehicle speakers.

  • Designed to work with two-way radios having 3 watts or greater of speaker output.
  • It automatically mutes the stereo when a 2-way radio (CB/HAM) voice transmission is received.
  • Makes an external speaker obsolete.
  • Voice transmission switches to the two front vehicle speakers while other speakers go mute.
  • Three seconds after transmission is finished, the stereo returns back to normal play.
  • Fast and easy installation for the do it yourselfer.
  • About the size of a deck of cards: 1.5” wide by 2.0” deep x .75” high.
  • Built to last with water proof potting to encapsulate the circuitry to protect against temperature change, vibration, dust and accidental immersion in water. JIS8 rated.
  • The CBM-JK allows the 4x4 off-road enthusiast to enjoy their music on the trail without missing a call.

$59.95

Add to Cart

Designed and manufactured in the USA.

Use with the TDS-15A Transmit Detector Switch to be able to transmit messages for an additional $59.95.

Learn More
Download Wiring Diagram

More Like This

CBM-U4AM

- Used with a mono device having less than 3 watts speaker output such as a hand-held two-way radio with a mono output that needs amplification
- Provides enough power to amplify and drive a pair of vehicle speakers.
- All other functions similar to the CBM-U4.

Learn More

CBM-U4AS

- Used with a stereo device having less than 3 watts speaker output such as a laptop computer or computer that has a stereo headphone output
- Provides enough power to amplify and drive a pair of vehicle speakers.
- All other functions similar to the CBM-U4.

Learn More

What Our Customers Are Saying

Hi. I just installed the “Wiz” into my wife’s Grand Am and the “Audio Interrupter” and the “TDS15A” into my Mustang Convertible and wanted to share with anyone else who uses two-way radios in their car how impressed I am. Took just over a week delivery time from the US to Canada. Connected it to the radio in my wife’s car. Plays through the driver’s door speaker.
T.Black
"I also purchased the Audio Interrupt for Ford 2003-2014 to connect another ham radio to my 2007 Mustang Convertible. With the roof down this car is very loud, so I wanted something that would completely mute the car radio audio when I receive messages over the ham radio. Also, I wanted to hear the ham radio through the high quality speakers in the front doors. This product does just that. Three seconds after the ham radio audio is finished the car radio audio comes back on. The ham radio audio that comes through the front door speakers has a clarity that it has never exhibited before. It sounds awesome."
T.Black
"I recently purchased and installed the VHF-U4 on my sailboat. It is a great product and works exactly as advertised. The installation instructions were about as fool proof as they could be." Three seconds after the ham radio audio is finished the car radio audio comes back on. The ham radio audio that comes through the front door speakers has a clarity that it has never exhibited before. It sounds awesome."
G. Myers
Previous
Next

Need assistance?

Contact us today at info@audiointerrupt.com or call us at 1-858-349-4918.

Contact