Hey Dave,
Just took delivery of the first HS cabs and new NV cabs for Oz , yesterday.
Just from brief initial testing one thing, that really stands out, the HS cabs are LOUD, I mean very loud. The HS cabs while sounding very punchy definitely seem fuller and deeper in the bottom end and the highs are more inline with traditional 410 & 210 cabs (as Ken stated) while still retaining that sweetness that the Bergantino cabs are known for. Jim, definitely has some magic going on in his X-overs.
My initial thoughts on the Bergantino HS series is that they are going to be a very versatile cab which is going to work well with SS heads as well Tube heads. Tried them briefly with the Sadowsky SA200 and it sounded sweet. It's hard to find a cab that sounds great with a tube head as well as SS heads. Weight, shouldn't be a concern with these cabs as the're shallower depth definitely makes them easy to move around especially with those H/Duty 3" casters.
I also have an Epifani S1 UL410 4 ohm which was traded for an IP310. Will be A/B 'ing them soon hopefully to see how they compare. Pretty tied up at the moment.
If you want to find out more PM me or email.
BTW, I thought I'd mention this seeing I'm pretty excited since these cabs arrived yesterday- really luv the new NV cabs.