Question about B&K AV 125.7 7-Channel Amplifier
I have suddenly had a problem with my B&W subwoofer. The last time i used it everything was okey. When i started up my home theather system today it only comes a clikking sound from my subwoofer.
I have tried to remove the signal cabel but that doesnt help. When it take the AC cable out and in again its quite for a few seconds but then the sound starts again.
Make sure that your amp is putting out proper signal to the sub woofer.
If the feed from the amp is okay, the power amp and our the power supply in the sub woofer may have become defective. This will require to be serviced.
Posted on Jun 14, 2008
Encountered same problem. The internal switched power supply consists of 3 parts : +12V(4W), -12V(4W) and +80V (500W). The + 12V circuit supllies the internal amplifier as well as an extra protection circuit (totaling about 4W). This circuit extracts a powerpeak when turned on. This powerpeak is somethimes to high for the +12 V power supply. Rather than soldering on the power supply board, I introduced an extra swithed power supply of 12V, 7W (from a Braun-beard trimmer !). The on board +12V enables the extra supply by means of an optocoupler and a Triac.
Posted on Jun 18, 2013
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