I was STAGGERED by the amount of volume I got outta my WA running at 4 ohms into my Bergantino NV215! Absolutely floored me! & the rest of the band! I'd actually taken my LMII along in case the WA was gonna run outta headroom
The NV215 isn't as loud as the NV610 cab is either(maybe not quite as loud as the NV412 is either(haven't tried nor looked at that) But I DO remember using my old Ampeg 100w V4BH > NV610 & it having quite a bit more headroom than when I ran the same amp thru the NV215.
I Often use my WA - in either it's scout combo WITH another 1x12(AE112) OR the WA head with the AE212- I LOVE both these rigs, & both are 4 ohm, but thru the NV215 it was another level entirely.
A couple of times I've been CLOSE to- but not 'AT'- the limit of the WA's limits as far as volume goes, when using 2 x 12"s - this was when playing with an 11 piece funk/soul band-5 voc's, 3 horns, keys guitar etc,,, oh & LOUD drummer!!!
But with the NV215 it seemed I had another 1/3 to 1/2 MORE headroom!! CRAZY but great!!!
Not only was it loud enough by a long shot, but the tone - with a Precision with flats & later on that night a Jazz with nickel rounds- was to die for.
EVERYONE in the band exclaimed about it!!! Even the crotchety ol' keyboardist (who always reminds me the JAZZ bass is the "Rolls Royce" of basses ;-) was saying it was the best bass sound he'd ever heard!