Research for subwoofer

it has been a year or so, but when i reached out to rel they responded back to me within a couple days then spoke to me on the phone when i requested that...

Two subs, not one. Beside your main speakers.

Mine are JL Audio. Powered.

Transformed my already-good-sounding B&W 803 D3 main speakers.

Seasons Greetings🎄!

Suggest that you check out HSU subwoofers at;

https://www.hsuresearch.com

I have two of Dr. Hsu’s subs and could not be more pleased. They accurately produce bass that I refer to as “tight and right” through all of the lower frequencies. Also you can give Dr. Hsu a call at (714) 386-9727.  His facilities are located in Anaheim, Ca.  Dr. Hsu or his right hand man, Kevin, will be happy to talk subs and your specific needs/set-up with you.  Their shipping cartons are built like tanks with steel reinforced corners.  I’m fortunate in that I’m only a 30 minute drive from Dr. Hsu’s Anaheim facility.  I’ve had several more “well known” brand name subs but I’ve been very impressed with my two Hsu units. Website has a wealth of info. 
Enjoy the music. 

Another vote for SVS!  

N

2 Rythmic's and you'll be happy but 4 would be better.