I have finished building a ST-35 and a MK-IV. I have most of the components for a second ST-35. I am looking for a PAS-3X to use with a DBX 223XL, electronic crossover, in a bi-amped setup. The MK-IV will handle the below 100HZ stuff and the ST-35 will cover the 100HZ and up. This works very well with a SS preamp. Separating the below 100HZ really cleans up the lower mids. The second ST-35 will allow for a tri-amped setup with a stereo 3-channel crossover.
What kind of impedance problems can I expect with a PAS-3X? the input impedance of a DBX active crossover is 25K ohms in unbalanced operation. The tube pre-amps are designed to operate into at least 100K ohms, mostly more.
Things that I don't know, greatly outnumber things that I do.