Yes, the surrounds only go to about 80Hz flat, so anything below drops to far off to be felt in conjunction with the fronts.

For the previous poster, the remix option is available in may receivers/pre's that allows you to set the various speakers to small and then the bass will be redirected to the LFE channel for each of those you set to small as long as the remix option is active. In my case, since I do not have "full range" surrounds and rears, it is ideal for me to remix the sub frequencies from those into the LFE channel.