I have a set of Focal Polyglass 165V components, and the midbass speakers are all distorted at high or lower volume.

My buddy and I initially hooked it up to his zapco amp, and it was all distored, he said the amp might not be working 100% before we started, so we figured that might have been the problem.

For now I just hooked up the speakers to the deck using the coss-overs, but the bass it still distorted at all volumes.

Are the speakers bad, or could it possibly be a wiring problem causing this?

Thanks