I have removed both the amp and the woofer from my ep500 and find that they both come off very easy, but the amp goes back on a little easier. For some reason having the heavy magnet on the back of the woofer makes it a little tricky to align with the holes. Make sure you leave the top screws for last when removing the amp, it makes it a little easier.

Make sure that you don't over tighten the screws when you put it back on though.

-David