It's also possible that one channel of the cartridge has slightly more output than the other. If you try everything that TWL has suggested and you still have the problem then a channel imbalance in the cartridge is quite possible.
The solution, of course, is a new, perfectly-balanced cartridge (nothing's ever perfect, is it?).
Why not do what I do? -- I just shift my listening position left or right a few inches to compensate for such imbalances, some of which are recording related, anyway. In my system, I think that there is a slight channel-balance difference between my CD and LP sources, so once again, I just shift my listening position as the source and recording dictates. You could also move the louder speaker closer, or the quieter speaker further away. There are really so many simple solutions to this problem. Pick one.
The solution, of course, is a new, perfectly-balanced cartridge (nothing's ever perfect, is it?).
Why not do what I do? -- I just shift my listening position left or right a few inches to compensate for such imbalances, some of which are recording related, anyway. In my system, I think that there is a slight channel-balance difference between my CD and LP sources, so once again, I just shift my listening position as the source and recording dictates. You could also move the louder speaker closer, or the quieter speaker further away. There are really so many simple solutions to this problem. Pick one.