I can tell you this from what experience I have with them ...the Nv610 is a sealed cabinet, it does the old school tone like there is no tomorrow, it's very easy to move around and load, and it sounds good with just about any high quality head you might use with it, I believe the sound/tone goals were engineered for that classic defined old school thump .... IMHO
The other Berg cabinet I have is a HS410 ( which is no longer made, but does show up used every so often ), I really like this cabinet, it has a nice voicing to it ... you can go from modern slapping to old school thump , it has a nice tweeter in it, that not too harsh .... it can sound very similar to the NV610 if you turn the tweeter off .... I believe the newer equivalent is the HD410 ... again this cabinet sounds good with all the bass-heads I have ( TH500, ThunderFunk 550B, Fender Bassman 1200 Pro, Traynor YBA-3, Crate BT-350 ) ... I believe most of the Berg cabinets are pretty efficient, meaning they really don't need a bunch of power to drive them to very loud levels, but the can handle some high power levels ( nv610-750 watts RMS .. HS410-800 watts RMS ) this is my non-technical view of the what I have ... as to the technical aspects of the Berg cabs, other will chime in, as a side note the berg cabinets will hold there value on the resale market