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Carver PM900, great amp except it "pops" loudly when I turn it on or off. No inputs, no surge suppressor...loud "POP." The big EV speakers can take it, I think, but the audience cannot. How can I fix this? I'm not an engineer and any help is greatly appreciated.
Carver make reasonable amps.
Had a quick look at the manual the amp has speaker protection, you shouldnt get a thump or pop at least at turn on.
A second or so after turn on do you hear a click from the prtection relays?, maybe that section isnt working properly.
Thanks Dr. for your kind and thoughtful reply. No click a second after turning on, just the loud pop immediately. I've taken another tack here, I've ordered a speaker selector switch. So, I'll turn the speakers off before switching the amp. We'll see...
This is one of Carver's magnetic field amplifiers. There is a free service manual at www.hifiengine.com. You have to register.
There are two service bulletins for this amp listed in the service manual.
One is for a speaker buzz. PM900 s/n below 711
One is for speaker noise PM900 s/n 1003 to 90X30900001 (Has a silver line filter - Delta Electronic 20DBAG5, not a TDK black one)
If your using the XLR inputs, make sure S3 is set properly for US or DIN standard for pin 3 being hot. The other inputs are not affected.