Cutting below 80 HZ on my mains, so subwoofers handle deep bass?

look at the new parasound halo integrated amp
it comes with built in crossover and good internal amp

I am going to use the halo amp to tri-amp my system 1digital.

i have the maggie 3.7 speakers driven by Oddesey mono amps 
coming off the halo crossover at 80 hz 

I have a pair of VMPS larger subs with alumn drivers , coming off the low frequencie output of Halo at 80hz , run by two crown mono amps (900 watts each) 

the halo integrated amp will be powering a mini maggie system 
with 2 bass panels and a set of mini maggie satellites that I will use
to fill any holes in imaging and  just get a much more full sound.
They integrate well with the maggie 3.7 , much bigger sound. 
the maggie bass panels will integrate the vmps subs and the maggie 3.7
the bass panels will improve the Maggie bass and the VMPS subs will handle all the low frequencies below 80 hz where you dont notice them ,

If you low pass your mains at 80 hz, this could be a less expensive alternative to see where your at. You really do not want to cross high and low at the same 80 hz frequency. A bit higher [high pass cutoff] is recommended rather than the same as the low pass filter cut.

http://www.parts-express.com/harrison-labs-fmod-inline-crossover-pair-100-hz-high-pass-rca--266-274

I have been looking at those fmod filters as well. Has anyone tried them? Are they fairly transparent? 

You really do not want to cross high and low at the same 80 hz frequency. A bit higher [high pass cutoff] is recommended rather than the same as the low pass filter cut.

So maybe cut 60 HZ and below for the mains, and set the subs at 80 HZ? Then there’s still a little play between the two. I see how not drawing such a hard line with the frequencies could help not create a hole in the audio.

You know, you could also just cut the subwoofer's low pass filters instead. :)