Lets Think #1 is there sufficient circuit power for the amp
#2 something wrong with the laser bias circuit
Something happen in shipping
Speaker / Amp / Preamp mismatch ?
Aka #1 you aren’t using a switched outlet
#2 you have sufficient gain into the amp
#3 are running balanced.... fully balanced
Your previous post great amp crashed and burned implies something else in the signal path needs to be tested
#2 something wrong with the laser bias circuit
Something happen in shipping
Speaker / Amp / Preamp mismatch ?
Aka #1 you aren’t using a switched outlet
#2 you have sufficient gain into the amp
#3 are running balanced.... fully balanced
Your previous post great amp crashed and burned implies something else in the signal path needs to be tested