Pioneer CD Player and Amp

My friend has a pioneer cd player and a 760W amp hooked up to 2 12" subs. There is an option on the CD Player that lets you have the subs rum normal, reverse, and off. When you play around with it nothing happens, it sounds the same and it doesnt turn off. What could be wrong?

Sounds like it's changing the phasing of the sub, and could be for testing purposes?

Have you RTFM?

RTFM?? I probably know what that is but cant think of it right now.

Read The Fucking Manual.