Question about Bose Acoustimass 15 System

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Acoustimass Subwoofer has a low "hummm" sound when turned on.

I have a Bose Acoustimass 15 system. The small surround speakers work just fine. However, the Subwoofer module emits a low "hum" sound when unit is turned on. I unplugged all the speaker wires from the back of my stereo receiver, and the "humm" still exists. The only time the humm stops is when I unplug the receiver cable connector from the subwoofer module.

I removed the cover from the subwoofer and replaced the fuse, thinking that somehow that might fix the problem, however, the hum is still there. It is a constant hum that never goes away, and it is impossible to use the system. Any help or suggestions would be greatly appreciated.

Thanks!Acoutimass 15 contstant deep hum is happening with mine too. What was the solution to this problem. I want to keep this unit but need some techincal advise from someone who fixed this. Thx.

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The huummm is either a short on the speakers cable, or one capacitor in the amp circuits had blown, or the unit is not grounded.

Check if speakers cables are OK, if it is not speakers cable, then the unit must be taken apart and tested by a technician.

Posted on Jan 23, 2009

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Its not at all due to fuse its due to connection getting loose on the main board needs dry soldering on all the junctions and complete drying for 24 hours.also can happen if the ic is at its last stage can happen due tio any component getting overheated.

Posted on Jan 22, 2009

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Hi

Check the main wire it might be going short with the body of your woofer . Check the ground wire and make it properly connected to the body .This humm is coming due to the "AC" current which flowing in the body.

Thanks
Rylee

Posted on Jan 22, 2009

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A humm is probably caused by a grounded electronic component or parts. Sometimes, its due malfunctioning poetentiometer, you need to check that. Also it may require checking the board for faulty capacitor like a bulge or burned one. If you found one, replace that.

Posted on Jan 22, 2009

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It sounds like a bad ground, Run a wire to a pipe, if you can just to see, if you have alligator clips and a wire, that will work. I was just reading this morning about a device that establishes a better ground connection for the same issue. If I have time i'll backtrack it otherwise 9 out of ten times that is what is is

Posted on Jan 22, 2009

  • George Bill
    George Bill Jan 23, 2009

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A low frequency hum will occur when the wire connections between components (speakers) are not clean, tight, and neat. It's easy to cross wire when things are not neat. It is also possible that any factory supplied cabling has a broken wire inside of it, causing the problem.

Posted on Jan 22, 2009

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I have a Bose Acoustimass 6 Series III the receiver is Yamaha 3066, this system is a 5.1 surround sound. Then I bought a pair of Bose 901 Series VI Direct/Reflective speaker system with active equaliz


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Unable to receive optimum output. The bass is totally flat !


Hi, ok the Bose Acoustimass III system consists of two small cube speakers and one subwoofer unit called the Acoustimass bass module. If the subwoofer stops working, three points can be the cause of the failure. The Bose Acoustimass III is a passive system, meaning the speakers do not power themselves, but instead are connected to a receiver or amplifier. Thus, the amplifier, the speaker between the amplifier and the subwoofer, or the subwoofer itself could be the issue.

Things You'll Need:

* Amplifier
* Speaker cable
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Instructions


Disconnect the speaker cable from the back of the Bose Accoustimass bass module and connect it to a subwoofer that is known to be working. If the subwoofer works, the bass module needs to be replaced.


Disconnect the speaker cable from the back of the receiver or amplifier you are using and from the back of the subwoofer in Step 1.


Connect a speaker cable that is known to be working between the back of the receiver or amplifier and the back of the Accoustimass module. If the module starts working, then the cable was the issue.


Disconnect the speaker cable from Step 3 from the back of the amplifier or receiver, then connect the cable to the subwoofer port on the back of an amplifier or receiver that is known to be working. If the subwoofer works, the receiver was the issue. If the subwoofer still does not work, verify that the speaker cable is in the subwoofer port of the receiver/amplifier and that the cable is connected securely to the subwoofer.



If you think you did the connection properly,Fine... If not you can use the manual from the below link and know how to connect it properly..

products.bose.com/pdf/customer_service/owners/og_am5iii.pdf


Have a nice day..

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If you have it literally conencted the way you say not much good will happen.

The speaker OUTPUTs for the Yamaha feed the INPUTS on the Acoustimass Module then the satellites branch out of the Acoustimass Module's OUTPUTs.

Acoustimass module
Bose® recommends putting your Acoustimass module at the same end of the room as the
television monitor. To prevent interference, keep the module at least 2 feet (.6 m) from the
television.
• You may hide the Acoustimass module behind or under furniture, but do not block the
opening. Be sure there is at least 2 inches (5 cm) between the opening and any surface.
• If the opening faces the wall it increases the bass; if it faces away it decreases the bass.
For the most bass response, place the opening 2 to 3 inches (5 to 8 cm) from a wall or
corner.
• Stand the Acoustimass module vertically or horizontally (Figure 6). To stand it on the
cable connection end, remove the cover by gently pulling it away

Move the sub closer to a wall or corner to increase the bass.

This is a SYSTEM and as such is not designed to be pieced out or separated. I don't recommend that you try it that way. I doubt it will improve the sound.

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Sounds like an inadequate ground wire in the signal cable. You may have to replace the cable between the reciever and bass module. It also, however, may be IN the bass or reciever module.

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