I've noticed something weird with my 3000 Micro and I can't work out what's causing it. During parts of a particular track, I notice the bass sort of fading out and back in which sticks out even to my untrained ears. This does not happen through my SB4000, SB1000 Pro or even through headphones.
As far as I can tell the unit isn't faulty. It happens even if I stick my ear next to the driver which sort of rules out room modes? FR sweeps in REW with mic at close range seem to produce a consistent response with no glaring dips. SVS support suggested using a smartphone as a source to rule out the upstream and it still does it. Could it be something to do with the dual opposed driver design?
The track in question is:
and the first occurrence is at 45-46s when the bass notes play. I hear a discontinuity that only occurs through the 3000 Micro.
Does anyone have any ideas? It's driving me a bit nuts.

I'm sort of regretting not just getting a second SB1000 Pro. Apart from the smaller footprint, the 3000 Micro seems inferior to me. I wonder how many other tracks are missing bass information!