Describe more as to how you hooked it up 'wrong'.....If you hooked the amplifier outputs to the line-level inputs (hard to do) that would be a problem. BUT if you mean you hooked a line-level output from your preamp to the line input on the subwoofer - thats what you are supposed to do, as the subwoofer has a low-pass filter (or adjustable crossover) built in.
