Good questions! I did like the 18’s cantilevered for the most part, I just liked the feel of the JBLs mounted underneath me better, with or without isolators. I think the main reason for this was that I could localize where it was coming from a little bit from the cantilevered mounted 18’s. Also, even though the 18’s seriously brought the TR deep into ULF territory (verified with VS), I just didn’t feel it as strongly as the JBLs underneath me. And the actual feel itself was different as well.
Part of this may have been the design of the platform for the 18’s, but was about as rigid as it gets, which is recommended for the BOSS to be optimal. IDK, I just liked the feel better under me vs cantilevered. BUT, this just may be system specific (room, seating etc), as Nalleh runs cantilevered BOSS (he tried 18’s as well) and likes the feel better with it cantilevered, so ……
As far as the 18’s having a significant gain in ULF over the JBLs, surprisingly not really. Well, at least with the BOSS more in a ‘SubRiser’ (mostly/quasi sealed) config with the carpet and pad on the floor acting as the bottom of the cab with no isolators under it. I got way more ULF under 15 to 20hz running it this way compared to iso’s under it. It also just feels better to me this way too, feeling a little snappier an punchier, while eliminating that sometimes ‘fluttery/bouncy’ feel in that above 20hz area, just making it more realistic feeling to me. Again, could just be a preference and or room variable/gear thing.
BUT, I will say that the 18’s could bring the ULF TR super easy and with massive excursion ( I pulled my SI DS4-18’s from their cabs to try them). I suspect that I would like them more than the JBL 12’s, or should say, they would be more ULF TR capable than the JBLs 12’s if mounted the same way in the riser that the JBLs are in underneath me. The problem is, the 18’s just need SO much space, as they are huge!! If I used them in the 6” riser I’m running now with the JBL 12’s, it would have to be 12” or higher at least to accommodate the 18’s. Way too high for me in this room. So, the JBLs are the win for me
Always pros and cons in this game it seems.
I hope all that made sense.
So, there is that for mainly the subjective, so here is a little something for the objective as well for a visual to go along with it from a VibSensor reading I took on both of them. Both gave killer ULF TR.
The "6 JBL 12’s only with no isolators'" are on the (LEFT ) and the 3 SI DS4-18’s with isolators cantilevered on the (RIGHT). Both around ref bass levels with 0-50 White Noise and easily pegged the Z axis LIMIT. Never mind the falloff under 10hz, as this just happens with VS using the phone and 5lb bag of rice for weight. Maybe d00d’s RPI devise or what they come up with in the future will overcome this shortcoming. That’d be cool! One thing the cantilevered design does do is bring in more (Y axis) forward to back movement.
Anyway, great stuff guys, keep it coming! Maybe this thread will have some interest after all
, as I was a bit unsure, but hopeful, when creating the thread.