1 - Does it happen with a different source or does it only happen with a cd? If yes go to #3 If no go to #2
2 - I would first start by reversing the right and left speaker cables. Did the problem move? If yes it is not the speakers. If no I would look for a loose connection either in the crossover or the individual drivers.
3 - If yes I would reverse the output cables from the cd player. Did the problem move back? If yes the problem is in the cd player or interconnects. If no I would be looking at the output connections in the amp. It may be a cold solder joint. Might want a pro or manufacturer to troubleshoot from there.
2 - I would first start by reversing the right and left speaker cables. Did the problem move? If yes it is not the speakers. If no I would look for a loose connection either in the crossover or the individual drivers.
3 - If yes I would reverse the output cables from the cd player. Did the problem move back? If yes the problem is in the cd player or interconnects. If no I would be looking at the output connections in the amp. It may be a cold solder joint. Might want a pro or manufacturer to troubleshoot from there.