I know the EVM 12L's are spec'd for a Theile type of cab, but I can't find any information on the type of cab spec'd for the SRO. Open back, detuned, Theile type . . . the list is long. I'd be building this for an amp based on the #40 Dumble. I can't believe this thing - has a 3 lb. Alnico magnet on it !!!!!