Don’t know what PA is. I love Octave and would own it myself, but at 75 Wpc I’d be a little concerned if it has enough power. Also, from what I’ve read of Octave their house sound is on the neutral side as tube amps go but that may work for what you’re looking for. Personally I’d like at least 100Wpc on tap, but depending on the design of the Octave it may still work. Personally I think that Octave would sound magical in your system as long as it has enough power. Another one I would look at would be the Unison Unico 90 that’s a hybrid and was recently reviewed by Michael Lavorgna…
https://twitteringmachines.com/review-unison-research-unico-90-integrated-amplifier/