Speaker w/F.R. 100hz & Receiver Bass crossover

I'm trying to build up a econd system.
My receiver is NAD 742.

I'm trying to get a 5 speakers package and interested in Kef KHT 2005 or 5005

As I know, for most receivers, you can set your speaker setting as "large" or "small". If set to "small", signal over 80 goes to the sattlelite speakers and signal below 80hz goes to the subwoofer. I heard that the crossover point of 80hz is recommendation by THX.

Anyway, 2005 speakers goes down to 80hz which works out good, but the more expensive 5005 goes down only to 100hz...

so... isn't that a problem? Am I going to miss the signals from 80hz-100hz on 5005???

http://www.kef.com/KHT/KHT2005.2/sat.htm
http://www.kef.com/KHT/KHT5005/sat.htm