A long time ago I was the original owner of a pair of ML-2's and a ML-3 which ran the bass panels for my Tympani 4's. My opinion was the ML-2's were great amps for many situations. The 3 I would only use for low end power use. My recollection was it's performance was not real musical with a poor top end using it full range, but maybe it was just a system mismatch. If you are still considering the 3 I would strongly urge an audition if possible.
Good luck
Good luck