Your speakers are full range speakers with active 12" subs built in, correct? You should be able to get very good results crossing these over lower than 80hz. Because of the effieciency of your bass system here, You should probably try to cross lower. Yes, experiment and see. You may find they're very powerful and dynamic even full range, set to "large". If your receiver selects at different freq's, like 40,50,65hz, etc, you should try those. I would.
Should i cross speakers over to "small"?
I have ht set up w/ the following: Yamaha rx1500, def tech 7002 bipols, def tech bpx2 surrounds(7 speaker system) and Def tech super cube II. I finished my basement and dedicated it to ht, room is 15 x 27, so i have speakers all set to "large". I like the 1500, but dont know if it has enough to handle what i have. Sometimes i dont feel the channel discretion....Would this help?