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Ok so that would explain why bridged still works but I never found out why stereo stopped working. It has been fine since the initial 2 occurances that resolved itself.

On the switches issue they were moved extensively when the system was working as I was testing different configurations when I first bought the system. I had to make sure all modes worked before paying which I did confirm. The issue arose a couple weeks after I had settled on stereo mode so the...

The source was the right channel output of a balanced XLR signal from a mackie 4 channel mixing board travelling through an XLR cable into a dbx driverack pa2 as a mono input into the left channel input. The driverack pa2 was configured for a mono input which then output 3 pairs of stereo...

Thanks for the suggestion. No phantom supply was sent. And if it did it would have originally gone to the dbx driverack pa2, not the amps, which was when I first noticed all 4 stopped working. I then tested them individually with a direct line in and bypassed the driverack. It's possible that...

That cable was done correctly with resistors however this was not the source cable used in the setup. I merely mentioned that summing a stereo input in an amp wouldn't be difficult. Signal cable used during testing was a standard balanced XLR from a single balanced XLR source channel tested on...

Agreed, it's not dirty switches. 4 individual switches can't all fail and resolve simultaneously on 4 amps that were tested both simultaneously and then independently. For stereo mode, custom cables were not needed. 1+- cables were used and working previously and then these same 10' cables...

See bullet #2. I verified +-1 wired correctly. Also used multiple cables. That's why I'm confused, it shouldn't work in bridged with a +-1 cable. Update: it randomly started working in stereo again. All 4 amps. Nothing changed. It has to be a voltage issue or something related to the outlet as...

I've got 4 Accusonic/Show amps (2 x PSA-3900, 2 x PSA-31500), all four of them were working in all modes (stereo, bridged, parallel/mono). The following day I was testing them out and all of a sudden all four amps only work in bridged mode but not stereo mode or parallel/mono mode. Has anyone...