Svs sb17-ultra for music

Here is the right type of subwoofer for your speaker.

Tekton C sub

https://tektondesign.com/product/subwoofers/cinema-sub/#color

If it's a relatively new sub, you may not get much actual hands on experience. I would get the SVS before I'd get a REL. 

With the high efficiency of your JBL speakers, you want a sub with some power and most will recommend a sealed design for music.  I have a combination of two SVS SB 13 Ultra subs and two Rythmik F25 subs and have used them with high efficiency speakers like Klipsch Chorus.  SVS sealed subs are fine for music and their newer ones offer nice setup options.

If it was me, I would consider getting 2 (or more) smaller subs to help combat standing waves.  I would look at Rythmik in addition to SVS. 

Your JBLs go pretty deep on their own and you just want to fill in that bottom region that they don't quite reach. 

If you are space / budget limited, then one big sealed sub is not a bad way to go, but you may have some peaks and nulls in your room.  Adding more subs will help with that and also give a more realistic sense of "being there" listening to the music being played live.

I'm hoping the post about the Tekton "Cinema" sub was either a joke or a troll post. A 300 watt ported sub that appears to be designed for home theater is not what you want.

Absolutely not a joke.. It was designed for music (and movies too)... I currently have a pair...very different design ethos, gets down below 20 hz, sounds nothing like the crap ported subs you may have heard.

On the same note, it is not your regular sub driver either. 300 watts is more than enough before it blew your pants off.

There are some jbl guys who like to diy horn loaded subs, etc. This would be a better option on the cheap, imo.

(Cons: it is huge, not for WAF living rooms, but, if the dude has a jbl 4367, he probably doesn't have WAF issues)

I’m hoping the post about the Tekton "Cinema" sub was either a joke or a troll post. A 300 watt ported sub that appears to be designed for home theater is not what you want.

Personally I would avoid any subwoofer that uses a passive radiator. Based on that reason alone I would choose the SVS. I agree with Big Greg that a subwoofer is going to excite the nodes/standing waves of your room, so you might want to have a plan as to how you want to deal with them. You will also want to plug the ports on the JBL’s

I had the SVS SB16 Ultra with my JBL 4365's, and it was an absolute treat! The sub was completely transparent. Highly recommend the SB17.