If the total load is too much, you'll know soon enough: the circuit breaker will trip

In theory, the amp should be alone on the circuit, since at full output it will draw near the maximum current rated for your circuit. In practice, I think you are good to put more than just the amp on it. I would avoid other heavy current draws like TVs, projectors etc. on the same circuit however.

[This message has been edited by soundhound (edited December 23, 2002).]