Question about Bose Acoustimass 5 III System

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Loss of bass when both left & right speakers are attached?

Recently, I noticed that the bass was almost completely absent so I thought the amplifier had blown or had an impedance problem. I have checked the amplifier (Rotel ) and found it to be ok. I then connected my accoustimass 5 to another amplifier to be sure and the same problem occured. I have removed the rear panel on the sub woofer and cannot see any visible damage to fuses or any other part but I am not an electrical engineer! Has anyone experienced this problem before or will I end up sending my speakers (which are way out of warranty) back to Bose?
Any help very much appreciated!

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  • jamie_duncan Jan 23, 2009

    OK, I have determined by myself now that the circuit board in the sub bin is faulty but I don't know where to get a replacement? Anyone?

  • dennisbrooks Feb 15, 2009

    I have the same problem as jamie_duncan. The bass is restored if either the left or right input is disconnected.

  • jamie_duncan Mar 08, 2009

    Thanks for trying but I have exhausted all of the wiring optioons available. I did however remove the cover on the sub and found the big resistor looking things on the pcb had leaked out their contents! I'm going to try and replace these once located from RS components. Otherwise, after reading several negative reviews and listening to my old B&W speaker (Great sound - much ,much warmer!) since losing my bose I feel an upgrade to the Mission 5.1 may be on the cards! These get wonderful reviews. (Persuading the wife is my next hurdle!)

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I have solved my problem having called a local dealer. They suggested that the bass unit was connected out of phase. I was convinced that my connections were correct having labelled the speaker wires with coloured tape. However I reversed the connections on one channel and surprise, surprise the bass was restored. It's a no cost option so it has t be worth a try.

Posted on Feb 20, 2009

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