Question about Bose Acoustimass 15 System

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I have an acousticmass 15, and the subwoofer emits louder hummm

I have an acousticmass 15, and the subwoofer emit a hummmm even when it is totally disconnect from receiver and speakers, The Bass control of the module appear to be a little loose when I twist the control the hummm dissapear, maybe I need to change the bass control but I don't know the type of control. I remove the cover and everithing looks well no disconnections or bad soldered joins apparently.

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  • afibanez Feb 18, 2009

    Sorry for my bad english and my ignorance... What is a feedback issue??

  • afibanez Feb 18, 2009

    Ok. Thx. Yes I have checked all this issues, I isolated the subwoofer only with the energy power and when I turned on the hummmm beging very louder, then I twist the bass control and hummm dissapear and the subwoofer work fine until the bass control moves itself again (loose), maybe can work fine days even weeks but suddenly the hummmm begins again.


  • Ryan Lee
    Ryan Lee May 11, 2010

    feedback issues would be anything electronic near the subwoofer that could be emitting the humm you hear. typically trhis involves a audio input method of sorts i will use a microphone as an example. when plugged in and powered on if the microphone is to close to a speaker the sound picked up from the microphone travels through the speaker and emits feedback

  • Ryan Lee
    Ryan Lee May 11, 2010

    have you checked any feedback issues?


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Greetings afibanez,
so far from the information gathered from you, it sounds as if the control knob mechanism in the unit itself is going out. the fact that it adjust on its own, and the humm indicated that the position sensor in the control knob is malfunctioning. If at all possible visit the manufacture's website and there should be a search bar once you have searched for and found your product, there will or should be a link to help you purchase parts and accessories for the unit. I hope that i have been helpful and this fixes your problem. any diagrams or instructions can be found on the manufacture's website. if you are still unable to complete/fix this problem with the information available or that i have provided let me know and we can take further action at that time. but my main suggestion is to replace the internal working component of the control knob.

Thank you

Posted on Feb 18, 2009

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