Ricred--I know the Mirage M1 well! Most of the problems with that design centered, I feel, around the generous bottom end. It had lots of output but little definition. I understand what you're saying about imaging--it's considered perhaps a weakness of bipolar design--but in this regard I thought the M1 did very well. Image specificity seemed quite good to me. Go figure. Anyway, I appreciate your response.
Jaxwired: a short, but brilliant, analysis!