ProAc D2 & REL T-Zero mk3


I just ended my love affair with my Sonus Farber Concertino’s and picked up a fabulous set of ProAc D2’s…they are really fantastic. 
So my question here is, I have a REL T-zero mk3 that I was using with the Concertinos. This little sub only goes down to 30hz which is what the ProAc’s do as well. I tried them together with the crossover dialed up at just 2 clicks and while it sounds nice I’m wondering what I’m missing out on with a bigger sub. But at the same time my room is only 12w x 15d last thing I want is bass overkill.

thoughts?
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@jjss49 excuse my ignorance, I assumed they go that low being that they easily handled a 30 hz test tone. The little REL doesn’t go to 30 hz either. The crossover dial is marked 30hz - 120hz but the specs have it at -6dB at 37 Hz
proac d2’s do not extend flat down to 30 hz... not even close... the stated specs list 30 hz response limit but without a +/- db indication...

if they in fact do 30 hz they have got to be minus 8-10 db down from 1 khz... so proper subwoofer augmentation will absolutely present a true full range response, and a pair of rels would be great for that purpose... larger ones if you have a large room
Congrats on the new speaker purchase.I would suggest trying a single T 7x or 9x and see where your at....then if or  when funds permit add a second one.The S510 is the best option in my opinion (a pair actually) and would be fine in your room.