I have my Denon receiver on -5dB for my EP600 and like 6-7 o'clock on the amp gain knob, and still stays on all the time. To me sounds like the amps have issues.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85