Some what of a newbie and need some advice about the possibility of using older JBL speakers with the newer Northridge series. Would like to use my old (approx 13 yrs) LX-44s for my main left and right channels with the EC 25 (or EC35) for center, E20 for surrounds, and E150P for subwoofer. I've read that matching the timbre of the front channels is critical to achieve proper surround. Would I better off replacing the LX44s and going with a matched set for all the satellites? Since budget is an issue , if I went with the matched set I would have to settle for much smaller front channel speakers than the LX44s. I'm planning to get a Yamaha HTR-4790 so I'm wondering if the YPAO feature would provide enough adjustment to match the LX44s to the EC25/EC35 center channel. Also, I'll be using the system for both HT and music and my room is 17' x 18' with 18' ceiling so would also like opinions if this system will be adequate for this space. Appreciate any help y'all can provide.