My 2 cents
I used a Hi-watt 100w w/4-12 cabinet sitting on top of a Leslie 122 for Synth (2600) & piano (CP70) amplification.
Didn't take to long to blow the 12's - Evans Music City repair guy said try & Replace with these Black Widows he had. 4- 12"
Noticed two things - much louder / better...