Hello,
It sounds as if you have a problem with your amplifier.
Check to make sure that the output package connections are set to the same connection i.e. maximum output connect the pink and violet cables to E6 left and E6 right.
Check the amplifier for dry joints (cold joints USA) on the connection pins, jumper connection plug and connections between the pre amp and driver board stages.
Regards
Alan Hood
ami-man
UK