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.
So is this something I can do myself? If it is the cable connecting the receiver and bass module, would I have to purchase a whole new cable? I guess I'm just looking for the cheapest way of fixing it.
Thank you Simplemitch,
So is this something I can do myself? If it is the cable connecting the receiver and bass module, would I have to purchase a whole new cable? I guess I'm just looking for the cheapest way of fixing it.
I had the exact same problem, and ordered a new cable from BOSE, however that did not correct the issue. They also sent an impedance matcher that goes between the RCA plug and the receiver, but that did not help either.
Any other ideas out there?
I had the exact same problem, and ordered a new cable from BOSE,
however that did not correct the issue. They also sent an impedance
matcher that goes between the RCA plug and the receiver, but that did
not help either.
I have the same problem. I contacted Bose technical support a while back. Unofficially, they know of the problem and newer models should not have this problem. My speakers are about five years old and have always had the problem. Tech support initially blamed bad wiring in the house. I eventually purchased a high end computer grade UPS and plugged the subwoofer into the UPS with nothing else connected to the subwoofer. The UPS was not plugged into a power source so the subwoofer was running on battery. The hum still occurs. I am still looking for a solution. I have the same problem. I contacted Bose technical support a while back. Unofficially, they know of the problem and newer models should not have this problem. My speakers are about five years old and have always had the problem. Tech support initially blamed bad wiring in the house. I eventually purchased a high end computer grade UPS and plugged the subwoofer into the UPS with nothing else connected to the subwoofer. The UPS was not plugged into a power source so the subwoofer was running on battery. The hum still occurs. I am still looking for a solution.
Did you ever find out the cause of this problem? I also have a hum now, and it gets louder when I turn up the LFE knob. When I shut the power button off it (the hum) sometimes goes away for anywhere from 5-30 mins but returns again until I turn it off again.Did you ever find out the cause of this problem? I also have a hum now, and it gets louder when I turn up the LFE knob. When I shut the power button off it (the hum) sometimes goes away for anywhere from 5-30 mins but returns again until I turn it off again.
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Re: Acoustimass Subwoofer has a low "hummm" sound when...
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.
Try using the plug adapter ones uses when they have three prong and need to use a two prong. I have a klipsch sub that did the same and this adapter stopped it. It is a ground loop that is caused by the ground in the house electric.Try using the plug adapter ones uses when they have three prong and need to use a two prong. I have a klipsch sub that did the same and this adapter stopped it. It is a ground loop that is caused by the ground in the house electric.
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The setup is possible, but with several compromises. First off, to use the active equalizer, you'll need to insert this into one of the 2 channel AV channels limiting your listening with the equalizer to stereo only. The acoustimass subwoofer acts a driver/power regulator for the little cube speakers. It probably will not be able to drive the 901s at the correct level when attached to the Acoustimass unit as front left/right speakers. You could try running a dedicated set of speaker leads to the 901s which may work and still allow surround sound, but you'll lose the equalization capability on the 901s.
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 * Extra subwoofer
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..
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.
The entire 5.1 amplification system, in the Bose Lifestyle 35, is actually part of the Bose Acoustimass (subwoofer) module. The RJ-45 (network type) connector passes a low-voltage signal from the console to the Acoustimass module. If you were to hack the connection, and plug the speaker outputs of a 5.1 receiver to the RJ-45 socket on the Acoustimass module, you would blow the amplifier.
If you are really itching to replace the Bose Lifestyle 35 console with a regular 5.1 receiver, I strongly suggest you sell your Bose system, and purchase a Bose speaker system, such as the Acoustimass 10 Home Theater Speaker System, which is made for use with a standard 5.1 surround sound receiver.
Clarify, did it ever work for you? Were both receivers used properly configured for the subwoofer? Did you also test the other speaker moduels running off the subwooferto see if they work?
Speaker Receiver setting
• Left and right LARGE
• Center LARGE
• Left and right surround LARGE
• Center surround* LARGE
• LFE/Subwoofer ON
With an Acoustimass 16 Series II system or upgraded Acoustimass 15 Series IlI system only.
Thank you Simplemitch,
So is this something I can do myself? If it is the cable connecting the receiver and bass module, would I have to purchase a whole new cable? I guess I'm just looking for the cheapest way of fixing it.
I had the exact same problem, and ordered a new cable from BOSE,
however that did not correct the issue. They also sent an impedance
matcher that goes between the RCA plug and the receiver, but that did
not help either.
Any other ideas out there?
I have the same problem. I contacted Bose technical support a while back. Unofficially, they know of the problem and newer models should not have this problem. My speakers are about five years old and have always had the problem. Tech support initially blamed bad wiring in the house. I eventually purchased a high end computer grade UPS and plugged the subwoofer into the UPS with nothing else connected to the subwoofer. The UPS was not plugged into a power source so the subwoofer was running on battery. The hum still occurs. I am still looking for a solution.
Did you ever find out the cause of this problem? I also have a hum now, and it gets louder when I turn up the LFE knob. When I shut the power button off it (the hum) sometimes goes away for anywhere from 5-30 mins but returns again until I turn it off again.
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