Sub frequencies can go to the center channel. It depends on how you set your sizing of your speakers in your home theater. For example, I have my center channel and surrounds set to M which then only delivers over 80 Hz. My 2 main channels that are connected to REL subs are set to XXL delivering significantly lower bass.
Subwoofer with center channel
Does anyone here use a subwoofer with a center channel? I was watching a Riverside concert dvd today and was surprised by the amount of content being sent to the center channel. My Sonus Faber center speaker sounds good, but I wonder what I might be missing. I have a decent NHT SubTwo I subwoofer that I'm not using. Maybe I should give it a try..