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Back to my original post, XLR Interconnect on both ends had swapped signal and ground pins , so the amp saw signal on a ground and ground on a signal pin. The resulting hum was horrid. Has this...

Correct.

Results, no difference.

Will do tomorrow and report back. Thank You!

XLR pins outs are the same from the Audia Flight FLS1 out to the No 8 in. Pin 2 is +, Pin 3 is -. if oit of phase, 2 and 3 would be flipped at one or the other connection. Am I not seeing the bigger...

Absolutely do, now. The amps behave as if the class A rails are not working.

Absolutely. The amps behave as if the class A rails are not working.

I purchased the Audia Flight No 8 Mono blocks with the FLS 1 preamp. To het these amps to perform, my volume is around 95db and sonic image is not impressive. My $18K Parasound JC1 + simply out...