Subwoofer Suggestion


Hi guys I need your suggestion regarding subwoofers. My system is composed of Focal Kanta 3, Kanta center, 706BK it would be used 50/50 for music and HT. My room size would be 13m by 4m by 3(Length,width,height). Would it be better to go for dual pb1000/sb1000 or single sb3000 or single pb2000 or single PSA S1500?
kulo
I got the DEBRA array (4x 10” passive subs powered by 2x 1000w amps in my 15x20 room. I’ve tried upgrading speakers and still no bass (Tannoy Turnberry). Turns out it’s because of the standing waves in the room. I tried changing speaker location and listening spot- a little improvement. Once I added the DEBRA, completely got rid of my bass problems and blends perfectly. Best money spent on my system so far. 
I've checked the Debra array sadly it's again out of my budget. Now I'm starting to think that I spent too much on amplifier and speaker😂