Subwoofer advice


So looking to add a new component (or 2) to my system (Snell Type D, McCormack .5 or Jolida 502b, Schiit Saga pre, Rega Planet, Dual 1219 TT) and contemplating a sub.  Basement room is 14'w x 30'l x 7.5'h and treated with first reflection points and base traps on front wall.  Interested in the REL T series, either the T7i or T9i.  The Snells have 8" woofers so not sure the T7i at 8" will make a significant difference.  The room might be too big as well.  So it might have to be the T9i at 10".  Looking to supplement clean low end not anything bloated or overbearing.  

Any thoughts greatly appreciated!
pkatsuleas
+1 @rauliruegas  

OP - My room is 14.4x24 and the GE Forcefield 3's at 50% provide respectful and tight bass . 
and
Don't know where you're located, but my GE dealer is Speaker & Stereo Store here in St Louis. Wylie Williams has taken care of me for many years and I highly recommend him
.  http//www.speakerandstereostore.com/   

Thanks very much to all of the bassheads!  Great info pretty much in sync with what I've been researching.  A bunch of good suggestions.  Seems like the consensus is 2 subs for my size room - makes sense.  Always wanted to hear Audiokinesis' stuff.  Unfortunately way out of my budget at this time.  Basically, I have around $1500 to blow.  Was thinking a sub and DAC (see other thread in digital).  Really need to get up to speed with digital.  So, its a balancing act.  I started out thinking better sub and an inexpensive DAC like a Dragonfly. Now I'm leaning towards spending a bit more on a good dac/streamer.  

As far as the subs go, there are two local on CL that seem promising - a HSU vtf-3 mk-4 and a SVS pc-2000.  Any opinions there?  Really just want to experiment and start with one before jumping into 2 subs and a high pass filter (pretty sure I will get there eventually!).  I have had good luck with used in the past and it has given me good bang for my buck.

Thanks again
Whatever subwoofer you choose and however subwoofers you decide on, if you don’t want to turn you room into a giant shaker table experiment, isolate the subwoofer(s) from the front end electronics by placing them on springs. Problem solved! 🤗
I've had good results with Auralex SubDudes under the subs for isolation.

My experience with high-pass filters may be Ayre-specific, but I tried a Bryston 10B active filter and a Marchand fixed passive filter (4th order 80 Hz), both claimed to be balanced.  The Bryston really changed the sound, the Marchand removed a bit of the sense of air.  Both are gone.  I let the KEF Ref 1s run full range and supplement them below 40 Hz with pairs of Velodyne HGS-15s and HGS-10s and SMS-1 bass managers that provide acoustic room correction.