Hello all.
I have an RF 400.4 on the bench, all powers up fine and stable current draw. No overheating.
The problem is with the front channel, it's picking up noise from the cd source unit, you can hear the cd tracking when loading and skipping the disc.
The reach channel has clean audio and doesn't pick up any interference.
I've tried switching the rca's, earthing the rca shields to the head unit, using the same earth for head unit and amp. I've also repaired loose rca input solder joints and cleaned crossover and gain pots so far.
When I turn the front gain down the noise reduces but when it's turned up its very apparent.
All 4 rail caps are bulging.
Any help appreciated, thank you.
I have an RF 400.4 on the bench, all powers up fine and stable current draw. No overheating.
The problem is with the front channel, it's picking up noise from the cd source unit, you can hear the cd tracking when loading and skipping the disc.
The reach channel has clean audio and doesn't pick up any interference.
I've tried switching the rca's, earthing the rca shields to the head unit, using the same earth for head unit and amp. I've also repaired loose rca input solder joints and cleaned crossover and gain pots so far.
When I turn the front gain down the noise reduces but when it's turned up its very apparent.
All 4 rail caps are bulging.
Any help appreciated, thank you.
