I just can’t get behind PSA with their high-Fs Pro Drivers. Great for Mid-Bass punch, but require gobs of power to perform below that. When I looked at those B&C drivers, they were all in the range of 35-40 Hz for their Free Air Resonance.
And still, without 3rd party testing of any sort, all we have is hearsay when it comes to PSAs performance.
(Yes, I’m being hard on PSA. They should really send a Sub or two out for testing!)
VTF3 vs VTF15 is same Driver and Amp in different boxes which are tuned differently. I am pretty certain that Shady has said they do not incorporate DSP. (Likely why they are on the more budget friendly side.)
I think I would buy two Hsus over one Rythmik today if I were shopping and limited. I did buy two X-13s over two Rythmiks (or Hsus) just two years ago. (I have no regrets!)