@mrdecibel I'm tying to understand the whole transport/DAC business as I am still living in the past and enjoying older gear that has the capabilities that I need. Are all CD transports able to play all formats as long as the outboard DAC supports them?
I did try vertical bi-amping with my AR9's but I must have done something wrong as I caused a short in the right channel and overloaded one amp. I decided to try it when I got the new Blue Jean Canare speaker wire since I had to do a bunch of rewiring anyway. I had a problem with the spade ends on the speakers as they are quite large and able to turn and short against each other. One post is somewhat loose on the speaker and did turn and cause a short. This may have been the only problem and was solved by putting the spade ends on the amps and the banana ends on the speakers. I went back to my old configuration of one amp to both lower halves and other amp to upper halves. I may try it again sometime but it scared me enough to go back to my old way. If I can be re-assured that nothing can go wrong when wired correctly with vertical, I'll try it again.
What did you replace your AR9's with?

