A few years back, I noticed some increasingly LOUD buzzing from my surround sound set-up. One cause was the surround sound controller itself, the Citation 7. That reworking process was documented here several years back. Since the Citation 7 has been restored to service, it's worked perfectly ever since.
I peaked under to hood of the Parasound multi-channel amp and noticed the majority of the main PS caps were bulging. Well that's not good. So I removed it from service, ordered new caps with a higher Voltage rating, then began to disassemble the rectifier/filter board, replace the main caps and reassemble.
Here's one photo I found. Looking for the others. I discovered my disassembly notes while cleaning up the servicing bench, properly ordered the wiring, found the hardware and looking forward to getting it back on-line. This photo shows the height difference between the OEM 65V caps and the newer 80Vs. All six were replaced.
Recently had an unrelated problem with the HP amp cutting out. Thought perhaps the electrolytic caps in the DC protection ckt were out-of-spec. Then while listening last week, heard a faint 'crack' while one channel of the LP amp went silent.
So I dug into it last weekend and discovered a loose power switch and a loose bass level control on the custom active EQ/XO I built. I retightened, then checked by playing the cannon shot scene from "Master & Commander". No cut outs! Success!
Evidently the stereo control had become loose and vibration was sufficient to short the control wiring. This was the fault rather than the HP amp's DC protection ckt.
Sure makes a difference with respect to presence, depth, and spaciousness when BOTH subwoofers are functional. Each cabinet has a pair of 12" drivers. With both working, I'm back to four 12" drivers once again.
The cannons sound great!
I peaked under to hood of the Parasound multi-channel amp and noticed the majority of the main PS caps were bulging. Well that's not good. So I removed it from service, ordered new caps with a higher Voltage rating, then began to disassemble the rectifier/filter board, replace the main caps and reassemble.
Here's one photo I found. Looking for the others. I discovered my disassembly notes while cleaning up the servicing bench, properly ordered the wiring, found the hardware and looking forward to getting it back on-line. This photo shows the height difference between the OEM 65V caps and the newer 80Vs. All six were replaced.
Recently had an unrelated problem with the HP amp cutting out. Thought perhaps the electrolytic caps in the DC protection ckt were out-of-spec. Then while listening last week, heard a faint 'crack' while one channel of the LP amp went silent.
So I dug into it last weekend and discovered a loose power switch and a loose bass level control on the custom active EQ/XO I built. I retightened, then checked by playing the cannon shot scene from "Master & Commander". No cut outs! Success!
Evidently the stereo control had become loose and vibration was sufficient to short the control wiring. This was the fault rather than the HP amp's DC protection ckt.
Sure makes a difference with respect to presence, depth, and spaciousness when BOTH subwoofers are functional. Each cabinet has a pair of 12" drivers. With both working, I'm back to four 12" drivers once again.
The cannons sound great!