GarMan; We seem to be asking the same things. What I have heard is that the amps have critical parameters that must be similar in order to provide acceptable matching. Because there are so many variables it is best to use duplicate amps for each channel. Otherwise it is a crap shoot whether it will work. Why would the SE amp have such a narrow response band? The transformers must be inadequate or the circuit is deliberately rolled off in order to prevent feedback runaway. Frank Van Alstine deals with this in his articles. That is why he rolls off the ST 70 Dyna in his mod circuit. It is easy reading and very informative. I am using two chip amps with pretty good results. What I would like to know is how to incorporate a EQ. feature in the crossover, like the one in Waynes xovers. J.R.