tanstaafl,
You cross your subs between 800-900 ??
Does'nt that kind of defeat the purpose of having subwoofers? maybe a mid bass might be more effective

I am of the understanding that subs are ment for operation between about 10-200Hz max.

Your subs must sound very , muddy,
but - to each his own, whatever sounds right for you is the go !!

cya