Subwoofer with center channel

I actually have three subs.  Two REL that run in two channel and home theatre.  A third larger SVS sub that is connected to the LFE channel for home theatre only.

I was thinking that there was a crossover setting for center channel in my Onkyo surround processor, but I can't find it.  Probably need to find the manual. 

I was thinking about adding another sub for just the center channel, but I don't know if it's worth the trouble. 

I don't think sub frequencies are sent to the center channel.

@carlsbad2 I was wondering about that. 

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. 

@woots I went back through the menu on my Onkyo.  It does have a crossover frequency adjustment for the center channel.  I have it set at 60Hz, so I assume everything below that is going to the subwoofer?  My Sonus Faber center channel speaker is rated at 65-24,000Hz.  

I guess I could set it to full range and use my NHT subwoofer.  Set the crossover frequency on the NHT so only signals above 50Hz to 60 Hz go to the center channel speaker.  Doesn't seem like that would help much versus letting the low frequencies go to my main subs.