Is your amplifier balanced? What kind of subwoofer is it and how is it connected? If you have the sub hooked up via the REL recommended approach for a single ended amplifier but are running a balanced amplifier the REL is serving to jumper the two channels together, even when it is turned off but still connected. If you are feeding the subwoofer only via a RCA interconnect, then this would not be the cause. I only reference REL as these are the subs I own and am not sure the connection method of other subs. Try disconnecting the sub altogether and see what happens. Another item may be that some preamps have the ability to bypass all signal adusting (including the balance) to provide the most direct path possible (based on AR olds attitude that the less in the path the better, not a bad attitude), this may also be a cause. What if you hook up your source via a different input or read the manual to see if your pre has such a set-up and how to engage the "tone control" or in this case the balance control.
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