Svs sb17-ultra for music

Absolutely get two subs.  For the same price of one SB17 you could get two Rhythmik F12G subs that will go just as low as the SB17 — no integration software though.  Alternatively, you could get two SB13s for $400 less than one SB17, and I’d definitely do either of those options over one SB17.  FWIW, and best of luck. 

https://www.rythmikaudio.com/F12G.html

(Facepalm), if a guy’s ’plugging ports’, he probably shouldn’t even get a jbl 4367 and stick with some ls50 or similar matchbox speaker (guessing that’s how you roll).

Any speaker with low enough bass extension, ’full range’ will cause standing waves. Subs placed in the right location and dialed in corrextly will "fix" them.

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

@phusis , I need to build one of the horns, maybe something along these lines and try to get lower extension

https://www.pioneerproaudio.com/en/products/xy-series/xy-218hs

On a different note, the tekton definitely gets under 20 (not some exaggerated spec). As I mentioned, it’s a solution "on the cheap" with some phenomenal bass for his speaker design.

Horn-loaded subs are altogether different beasts and bigger still. From my chair there are no better "audiophile" subs than horn-loaded variants when it comes to smooth, layered, effortless and enveloping bass reproduction. They’re both less conspicuous in the mix and more shaking-the-air crazy powerful when called for, whereas direct radiation subs make themselves more known overall. The latter can be a quality to some ears with its more "thumping" and animating character, whereas horn subs have a more fluid omnipresence of bass.

I do have 2 rel s812 today. Buy my jbl take up to mutch space so I only use one. Thats why i want one bigger.

Personally I’d go with the Rhythmik E15 for about $1500 or the F18 for about $2k.