i am just finishing up racking 4 pm1000 modules in a 1U rack.
the first 2 channels (built from master modules) are working fine and sound great.
the 2nd two channels (built from the echo modules) have some problems. when i turn the gain up all the way, they will oscillate/motor boat and spew squealing noises. i have tried a few different things with the grounding but haven't had any luck. they sound good until they get turned up and start to go wild.
it is strange because i have them wired exactly the same way, same signal path.
anyone have suggestions on what to look for? is there something with the grounding? i have it connected in a star ground and am using the external PSU for some other pm1k's I have (they work fine).
the first 2 channels (built from master modules) are working fine and sound great.
the 2nd two channels (built from the echo modules) have some problems. when i turn the gain up all the way, they will oscillate/motor boat and spew squealing noises. i have tried a few different things with the grounding but haven't had any luck. they sound good until they get turned up and start to go wild.
it is strange because i have them wired exactly the same way, same signal path.
anyone have suggestions on what to look for? is there something with the grounding? i have it connected in a star ground and am using the external PSU for some other pm1k's I have (they work fine).