Research for subwoofer

My experience so far -

SVS - Reachable and happy to discuss.   Recommended SB300 for my set-up in my price range and suggest full power speaker connections were the best

Rhythmic - Only E-mail- Suggested the F18s which is out of my range  (I did give them a range) Suggested that the best hookup for their product was Pre Out off the Luxman

REL - Sent E-mail, Phoned every day and left messages for Jacob. Which is who their system directs you to.  No luck at all

most speaker companies have no capacity or will to respond to inquiries

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.