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. 

@carlsbad2 I was wondering about that. 

@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. 

@mswale I do have the channel balance set correctly, I believe.  My Onkyo generates a test tone and allows me to cycle through the channels and adjust the volume for each channel.  I'm only doing 5.1, so it's pretty simple.

I agree that a subwoofer on the center channel is probably not a great idea. Appreciate the input.

I don't have great locations for side speakers. My Onkyo supports 7 channels, but home theatre isn't a big priority. 5.1 sounds pretty good. 

@erik_squires Yes, I have three subs.  Two REL S/510 for two channel connected by speaker level connections.  These also connect to the LFE output on my surround processor.  The REL has separate gain controls for speaker level and LFE level inputs.  I run a third larger SVS subwoofer in the back of my room.  It only connects to the LFE channel on the surround processor, so it does nothing when running two channel.  I was toying with the idea of an additional subwoofer for the center channel, but after the discussion in earlier posts, I don't think it will help. 

My system is really two-channel with some components added to it for home theatre.  They are not in the chain at all when listening to two channel.   I don't list them in my Virtual System.

@soix A speaker level connection with the SVS and NHT would be difficult.  I'm currently sending the LFE channel to the SVS via a REL wireless transmitter.  And, I don't really have a great spot for the NHT.  It would be interesting to try four subs, though.

It's a shame to not use the NHT.  It's a nice subwoofer.  I could swap it for the SVS, but the SVS is probably better for movies.  The NHT has two drivers in a sealed enclosure with an outboard controller.  I had NHT replace the capacitors and they also replaced the tracking voltage controls a couple of years ago.  They were very helpful and reasonable about costs.  I think I paid $150 for the repair..