Hello,
I don’t know the specs of the Octave V80SE as I’ve never listened to it before, but it looks like a really great amp especially with the Super Black Box.
I would love to test it with Magnepan speakers.
For example, the MG20.7 will give you the deeper bass you’re looking for and you’ll be moved in the midrange by the sound and physical presence of any saxophone (e.g. Grover Washington Jr.’s version of "É preciso perdoar” in the LP “All my tomorrows”).
I would definitely recommend auditioning them with your amp.
Good luck on your quest!