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In 2009 I changed my BASH HC1011 http://www.thompdale.com/bash_amplifier/HC1010_HC1011/HC1010_HC1011.htm module for my subs. I bought an extra one in case my sats were going to crackle and hiss. And after a few months I had to replace the other Bash module as well. Everything ok until 2 months...

Here fez,I encircled the two sets of red and black wires on the ac/dc converter:

archangel76 go for the highest frequencie. Try to make contact with these people: http://www.ecplaza.net/tradeleads/seller/4454568/etd44.html they can help you further with how and where to get.Forget Radio Shack they do not sell this kind of stuff. Here a link and than you can download a...

The transformer on your board is an ETD-44 http://www.tauscher.com/html/etd29-etd44.html They are very cheap( I think about $10),if you can get them.

devilchrist it is the PWM latch which is causing all the trouble in the end: The PWM latch is a small item on the HC 1011 bash chip see all about it here: http://www.thompdale.com/bash_amplifier/HC1010_HC1011/HC1010_HC1011.htm You can resolder the HC 1011 and that will last a day,than...

fishhook remember when you check the voltages on J13 that you keep the red and black wires on J3 - J4 and J5 - J6. The system needs a load if not, the voltages will drop. Your pin 1 on J13 is ok. pin 3 on J13 is not ok,you get -22V so you have a problem with the U2 7915 the 15 in this last...

fishhook check the path of your board from C525 to tip 5 of J13 and do the same with Q510 and C539 to tip4 of J13 if they are broken you can fix it with some wire. edit pin 1 and 3 are for your sats and pin 5 is for your sub and pin 4 (22V) is going for your HC1011 chip

fishhook that is not right. I can measure all the points on J13 with my black probe on pin 2 of J13. So when you put the black one on pin 2 you measure +15V on tip 1 with your red probe. Your red probe on the tip 3 and your meter reads -15V. tip 4 = +22V tip 5= +32V

fishhook did you replace Z11 which is a zener diode: http://nl.farnell.com/fairchild-semiconductor/bzx55c22/diode-zener-0-5w-22v-do-35/dp/1700831?MER=i-9b10-00001144 aswell?

fishhook have a look at this again: your transformer is not dead I am nearly 100% sure of that. Try to replace ultra fast rectifier D10 which is a MUR 1620CT en replace ultrafast rectifier D4 and that is a MUR 1660CT and you get your 22V and 32V back

Ok here an update about the HC1011 bash chip. I replaced the part and my klipsch is fixed. My sub works again no hiss or whine or cracks or pops. It is the HC1011 bash chip in the buck converter that is making all the trouble if your sub or sats fails. Here a pic of my new chip and notice...

I have the same problem with the HC 1011 chip when it whines my sub goes dead. I ordered two new ones (one extra if my sats will give up). I think this little diode ( ? ) is the troublemaker,I put a screwdriver between it and the black thing (what is that?) and wiggle a bit: My sub...