Bose Acustimass 3 Humming

jjanderson · 2nd July 2008, 03:44 PM

Hello i have a humming Acustimass 3 active subwoofer.
I have put in new 16v/47uf kondensators but nothhing changed.
When the system get warmer the humming stops.
Do anyoune have a schematic or know why its humming?
Thanks

Nrik · 2nd July 2008, 05:08 PM

Probably the transformer.
Not a cheap sparepart.

Put it out of its misery - throw it in the bin, and get yourself a real subwoofer.

jjanderson · 2nd July 2008, 09:17 PM

Its not the transformator that make no sence

Bonsai · 3rd July 2008, 05:39 AM

What tune is it humming?

DigitalJunkie · 3rd July 2008, 08:56 AM

Quote:

I have put in new 16v/47uf kondensators but nothhing changed.

Those are too small of a value to be the filter capacitors.
Try replacing the Big filter caps in the PSU,I'll bet they are dying.

jjanderson · 3rd July 2008, 08:43 PM

Ok i have changed the 10000uf 35V caps too the humming is gone the relay ist switching but there is no more music... i dont know why

2nd July 2008, 03:44 PM	#1
jjanderson diyAudio Member Join Date: Jun 2008	Bose Acustimass 3 Humming Hello i have a humming Acustimass 3 active subwoofer. I have put in new 16v/47uf kondensators but nothhing changed. When the system get warmer the humming stops. Do anyoune have a schematic or know why its humming? Thanks

3rd July 2008, 05:39 AM	#4
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	What tune is it humming? __________________ bonsai http://www.hifisonix.com/

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2nd July 2008, 05:08 PM	#2
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	Probably the transformer. Not a cheap sparepart. Put it out of its misery - throw it in the bin, and get yourself a real subwoofer.

2nd July 2008, 09:17 PM	#3
jjanderson diyAudio Member Join Date: Jun 2008	Its not the transformator that make no sence

3rd July 2008, 08:43 PM	#6
jjanderson diyAudio Member Join Date: Jun 2008	Ok i have changed the 10000uf 35V caps too the humming is gone the relay ist switching but there is no more music... i dont know why

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