I'll second Slipknot1. There is a lot of info in the center channel, but its all dialog on DVDs, usually just vocals on 5.1 music recordings.
It depends on your speakers and room size whether or not you would gain any benefit from 2 subs. If you set your front speakers to small in your set-up you would gain nothing from running the front l-r or rear l-r through the second sub. If you set your speaker size to large and run them through the sub woofer than you might gain something. But it depends on how low your speakers go, and what cross over frequency your pre-pro is using.
If you feel your not getting enough kick out of the lfe channel, first experiment with the placement of the sub you have now, before buying a second.
It depends on your speakers and room size whether or not you would gain any benefit from 2 subs. If you set your front speakers to small in your set-up you would gain nothing from running the front l-r or rear l-r through the second sub. If you set your speaker size to large and run them through the sub woofer than you might gain something. But it depends on how low your speakers go, and what cross over frequency your pre-pro is using.
If you feel your not getting enough kick out of the lfe channel, first experiment with the placement of the sub you have now, before buying a second.