I just added a JL audio Fathum F112 sub. to the Cremona's and they sound great. I have the crossover set for 40 hz so the sub. only adds what the Cremona's are not capable of producing and it is so far the best upgrade to my system. The other components in my stereo are: Mcintosh MC501 x 2 mono amps., Mctinosh C220 pre amp., Mcintosh MCD500 cdp/dac, Sonos music server going into the MCD500 digital input. I was thinking about upgrading to the Elipsa before I added this sub. but now I am not so sure.