#1
http://guitars.musiciansfriend.com/product?sku=602078X

there it clearly says:
"B-52 ST-212S 140W 2x12 Guitar Cabinet - Scratch 'n' Dent Features:

2x70W 12" Celestion Vintage 30 speakers "

i thought v30s are 60 watts?
so 2 would be 120 watts.
Fender MIA Standard Strat
ESP LTD Viper 407
Epiphone SG
Starcaster by Fender(modded with Bill Lawrence l-500-xl)
PEAVEY 6505+ (FJA transistor modd)
Peavey 65 watt transtube studio-112
Marshall 1960AV
Vader 2x12
ISP Decimator
MXR 10 band EQ
#3
iirc, MESA cabs feature special V30's that are 70 watts. This one may incorporate the same thing.