Subwoofer with center channel

@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.

Sounds like you’ve got your priorities straight in terms of more highly valuing 2-channel. 😜  If possible I’d have all four subs working in a swarm array for stereo assuming you could have both LFE and L/R line-level inputs connected to the SVS sub simultaneously.  That’d be your biggest benefit in employing your NHT sub IMHO.  FWIW. 

@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..