Subwoofer advice

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 would get the HSU VTF-3. 

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.

3. Best Performance system- Audio Kinesis 4-sub Swarm for $3,000. This option will clearly outperform the other options since it will provide deep, fast, smooth, accurate, highly detailed and dynamic bass that will be perceived as the most effortless, the most natural and the best integrated with your main speakers. It will also be the most convenient option to configure since all settings are made once on the amp/control unit for the 4 subs collectively rather than separately on each individual sub. 

Good luck,
  Tim

   I've respected your detailed and informative suggestions helping people new to subwoofers by sharing your basic knowledge and your enthusiasm with this system. I'm saddened to read your declarations of, "Best, most, and outperform the other options."