I have 5 MHD amps in my boat, 2 750/1 and 3 600/4, when I turnn up the volume over half, ALL 5 amps shut off the green lights blink 5 times and come back on, once they come on the 3 600/4 amps play and the 750/1 amps do nothing, the green lights are on..
600/4 play 8 ws 650s & pair pro 485
750/1 play 2 10w7
I have 4guage wire going to each amp from a distribution black
The RCAs feed thru one another, come off the 420
Voltage never drops below 12 volts