Hey Dennis (tharkun), I saw some of your pictures, WOW!!! great system!! Also, I know that a sub is necessary for HT, but I only care for 2 ch. music.

I am not quite sure what the difference is between subs regarding down firing or up firing.

Axiom M60s, QS4s, VP100 Onkyo TX-SR804 Oppo 970HD Rotel RB-1080/RCD-1072 REL Q150E sub, PS 3