Does anyone have any information on the optional subwoofer? Ala, RMS power, what kind of enclosure it's in? I know it's got to be an 8" woofer, but I doubt it'll be all that great. So I need to know if it'll be easy to just throw in an ED 9kv.2 into the same space and call it good rather than having to go into some drawn out install. Info Center, do you know anything about the specifics if the audio system?