That is really saying something. I heard the Super 7 at RMAF and thought that they were truly incredible speakers, and you think the NX-Otica is at least on the same level - that is impressive. I would have thought that the Neo 10/Neo 3 combo was better than the M165NQ/16 woofers that (I believe) are in the NX's.
Speed & Detail vs "Warmth"/body?
Still very impressive if they are at that level...
If a pair of the servo subs are used on each side of the NX-Otica or NX-Treme then the bass response is the same. They are the same drivers. But you can use triples on either side of the NX models or even a stack of six per side and really take things up a notch.
The Super-7's, NX models are all really good but different. The real advantage of the Super-7's is the higher 97 to 98db sensitivity level while the NX models are in the 93 and 94db range. so the dynamics advantage goes to the Super-7's. And lower powered amps can be used.
The speed advantage in the mid-range goes to the Super-7, but not by a lot. While the Neo 10's are technically faster drivers they are also playing up higher in the Super-7 while the M165NQ woofers in the NX models are only playing up to a 1,300Hz crossover point. So the tweeter in the wave guide take over pretty quickly and the real speed advantage is negligible. The Super-7's have a sharper and crisper mid-range than the NX-Otica or NX-Treme. But the NX models have a little more body in the mid-range and more of an analog sound compared to the Super-7's.
And the NX models play lower and cross to the subs lower. Not a big deal on the surface as they both produce a flat response real easily. But drums and other instruments in the 100Hz to 200Hz range have a little more of a nature sound and a little more body with slightly better speed.
Again, the waveguide in the NX models is bigger and it allows the tweeter to play a lot lower. So there is some advantage there. And while the off axis response (horizontally and vertically) are great with both, the NX models are a little smoother horizontally.
But for me a real advantage for the NX models is the smaller baffle size (less surface reflection) and improved imaging and sound stage layering. I am really into that transparent layered sound stage.
Like I said, all are really good, but just different. Personally though I am more in love with listening the NX models. Imaging and vocal ranges do it for me more in those.