On a journey for the last couple of years

Before you replace your amps, demo a different preamp and/or possibly CD player.  You'd be surprised how much of an impact both have prior to the signal getting to the amplifier.

+1 @soix  If your speakers only reproduce frequencies of 32Hz and above, it would seem silly to suggest changing other equipment?  It would seem to be irrelevant how low a CD player can go if the speaker can't produce that sound. IMHO.  I also agree with the use of two subs.  If you are running mono block amps (as I do) I believe you need two subs to capture all the bass signal.  I've not seen a simple hook up that captures the bass signal from L+R mono channels into a single sub.  Not saying it can't be done, I just haven't seen it explained.    

Thank you all for the quick response. Room optimization is probably the best place to start, any recommendations on software to assist with set up? Also I upgraded cd player and pre amp and there is a noticeable difference, happy with both. To be clear I am not an audiophile but love great sounding systems. Perhaps best next step is to bring in single amp to demo then add another if necessary. As far as Subs go what recommendations do you have if I were to go with 2.

Thank you all for your patience.

P

RELs are a safe choice

any particular model based on current set up