Power requirements for Acoustat 2+2s

You shouldn't have any trouble driving the 2+2 with the VTL MB150. I have experience with Acoustat 8s driven with VTL Ichiban 200 watt monos, Acoustat Spectra 1100 driven with VTL Compact 100 monos and Acoustat 1+1 driven with VTL Ichiban, Levinson 23.5 and Acoustat TNT 200. The TNT 200 works incredibly well with Acoustat speakers. If you can find one buy it.

I used to own Acoustat 3's with the c mods and drove them fine with a Hafler 220, which if I remember was 100 watts per channel. The Hafler wasn't a great amp IMHO but it drove the stats to any level I desired.

I successfully ran a pair of 2+2s with Blue Medallion transformers with a pair of VTL Tiny Triodes ( newer version with 45 wpc in tetrode mode). Not too loud but up to the power limit, the sound was AMAZING. The TT 25s have a super deep stage and are very transparent. The MB 150s should have no issues with the 2+2s as long as you are not looking to have them at huge volume and dynamic swings. I am assuming the 150 monos are running either KT-90s or EL 34s? The later versions ( MB 175s) run the 6550c and will have an advantage in "PRAT" but not be a sweet in the mids.

Sweet speakers. I used to drive 2+2 medallions with ARC VTM200 monoblocks (6 6550C's / amp). They did the trick, sounded very good, but certainly were not overkill. It may come down to your room size and desired listening levels.

I had good results driving a pair of Acoustat 3 medallian mods with a Conrad Johnson MV75A-1---75 watts-6550 tubes.

Where I wasn't so lucky was trying to drive Martin Logan CLS11z with a 75 watt VTL tube amp.

The best sound you will ever get from any of the old Acoustats is to find the old tubed servo amps(nothing like conventional tube amps)and wire them up.

I have several friends who still run 4, 3 Panel Acoustats with the servo amps, and one has the Acoustat 2+2.

I have yet to hear any Acoustat sound as good as the servo amp powered versions.