Need an audio brainiac...Stumped...

how about bad caps in the altec crossover?

I replaced the xover caps and whats wierd is that 4 other amps work great with the Altecs and the dynaclone works great with any other speakers save those Altecs.. Got a set of Valencias in storage id like to pull and see how they behave since the voice coil/mag structure is the same betwenn the Santanas and Valencias. Mybe it is some inductive quality that only is present in Altec drivers..Thanks for the thought - best regards

Strange lack of synergy? It's got to be the output transformers reaking havock when paired with those crossovers. Impedance issues perhaps?

inductance or impedence...wow.

Well, it really could be anything, right? Two additional impeding mechanisms have to be taken into account when talking about inductance besides the normal resistance of DC circuits: the induction of voltages in conductors self-induced by the magnetic fields of currents (inductance), and the electrostatic storage of charge induced by voltages between conductors (capacitance). The impedance caused by these two effects is collectively referred to as reactance and forms the imaginary part of complex impedance whereas resistance forms the real part.

You are dealing with transformers in your amp output circuit, right? Maybe somehow they are getting saturated?