Dead thread, time to give it a jolt!
For those that have experience with these, how do you operate one in bridge mode?
I am under the impression you flip the switch on the back to "Bridged", turn CH2's input knob full CCW and then use CH1's input and then CH1's speaker Positive as positive and CH2's Positive as negative when connecting a speaker. Then only CH1's IOC light will pulse green in relation to the signal strength. From there you're supposed to enjoy ~3x the power output, double the slew rate and the other good stuff I'm after.
However, I went to do that with all four of my PS amps and only the PS-200's are behaving that way. When the 400's are turned on and in use, both IOC's illuminate equally in relation to signal strength. Is that normal for a 400? I can find service manuals and tech sheets, but not an owner's manual for a PS-400.
Other weirdness:
-The PS-400 driving my left sub actually turned off and then turned back on.
-The PS-400 driving the right sub also adds a considerable amount of ground loop hum to the system as well as itself, but most noticeably with the speakers being driven by the PS-200's. When turned off, the speakers being driven by the 200's are virtually silent.
Other notes:
-All of my PS amps were working just fine when last used. Two were already deployed in my system running stereo, including the PS-400 which is now adding noise to the system and itself.
-The spare PS-400 has a wonky 1/4" input jack on CH2. CH2 isn't used for Bridge-mono mode so I don't see this as an issue. This is the amp which turned off and then turned back on.
-Speakers being driven by the PS-200's are UREI 813C's.
-Speakers being driven by the PS-400's are JBL 2245H's.
-Everything is plugged into a Furman M8-S switcher, which is now plugged into a dedicated 20A outlet.
-For grins, I plugged all amps (minus signal input and not connected to speakers) straight into the two new dedicated 20A outlets I had installed. No hum from any of the amps. I suspect the Furminator is the culprit with my hum. It is being eliminated in favor of three Pyle PDBC70's- one for the 200's, one for the 400's and one for the accessories. Three of those because I don't have the funds for a single 20A switcher and those will cheaply allow me to use both 20A outlets, one for the 200's and one for the 400's.