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Bose av18 60 cycle hum in bass module

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Hum is tough. It is often caused by quite a variety of things. First, address the basics:
1. Make sure that none of your signal cables run near to power cabels.
2. If possible, feed all power from the same receptacle.
3. If your plugs are not polarized, try reversing one at a time.

If none of those basic checks uncovers your demon, verify the path of the noise by disconnecting the signal from the preamp at the input to the sub. If is still hums, then look closely at the power feed to the sub, More likely, the hum will stop (along with the music.) In this case, try breaking the shield ground at the sub input (e.g. with a ground isolation adapter.)

You should also confirm that the hum is limited to the sub. Subs tend to exaggerate hum because playing signals in the 60Hz is their forte. So with the sub turned off and bypassed, listen for the hum in your main speakers. If it is there, too, then start checking your sources. Remember, even a source device other than the one selected for play could be the source ... completely disconnect each source at the preamp to track it down.

Posted on Aug 08, 2014


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Posted on Jan 02, 2017

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SOURCE: front bose speakers and bass module stopped puttimg put sound

If you're saying you hooked the Bose speakers directly to the Yamaha's amp instead of the prescribed way through their own bass module - they're cooked.

Posted on Dec 28, 2009

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SOURCE: Doesn's play anymore unless I reset, and plays

Call Bose again. Since they sent you something, you must be the original owner or first to register the serial number with Bose. They have an excellent customer service and lifetime support to the original owner. It is best not to try to open the unit or it will invalidate your support plan with Bose.

The Hum is probably a dry capacitor on the power supply. The power supply is also probably getting warm and the unit is going into protection (safe) mode and shutting down.

Again, give Bose a call this afternoon or Monday.

Good luck.

Posted on Sep 10, 2011

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