If I were to buy a second sub to go with my system, How exactly would I go about plugging it into my system? My receiver only has one pre-amp out for a sub, and my first sub is plugged into that. If i use a splitter there, that would diminish the sound quality coming out of my subs, which is not something I would do. Axiom subs don't come with a RCA out connection to plug in another sub, either.

Any ideas?

thanks!

We actually added the line level out as a running change in our subs. This would allow you to go from your pre-amp to the new sub and from the new sub to your existing one.