One of my speakers sounds louder then the other.

If your speakers had equal volume at one time and you recently made a change causing you to move any of your equipment, check to make sure all cables are secure.

I would clean all of your connections; speaker cables, IC's. Tighten the screws on all the drivers so that they're snug and evenly torqued.

Is your room symmetrical? Try swapping sides with the speakers.

Just swap speakers and see if the problem moves with the speaker, if it does then you will know that the speaker is the problem.

Begin reversing interconnects and speaker cables to isolate the problem.

It may not be the speaker.