I can’t speak to your specific model of REL speakers but if you go to REL’s website (rel.net) you will find that you can call for assistance with “Speaker Pairing” or use their “Speaker Pairing Tool” to find out based on what speakers you have and how well they will pair with REL models or REL to REL pairing.
I used to own a REL 305 sub (discontinued) with a SS sytem and it sounded fine until I changed systems due to amp failure. So I upgraded my system (you can see in My Vitual Systems) and now I use 2 - REL S/812’s (also discontinued) and couldn’t be happier to have made the change from using 1 to using 2 subs. I find that there is a more balanced air charging when the subs are doing their thing…
I’m an old bass guitar player, so of course I’m looking for the clarity in bass notes in the music I listen to which spans the spectrum but lean mostly to Jazz and Contemporary Jazz (NOT SMOOTH JAZZ!)
I think a pair of REL’s Sub-Arrays are in my future!
Happy pairing!

