I have a pair of ML Vantage speakers and yes I did have them modified for biamping to get deeper bass but the panels are powered by a Rogue 90 tube amp with a tube pre and the sound is fine, in fact better than fine.
martin logan speakers
i live in los angeles county california. in the outskirts there is whittier where there is a mcintosh dealer which has been there since like 1950. they like martin logan speakers mated to mcintosh equiopment. i never asked them why but is there anyone out there who might know if martin logan speakers are a good match for mcintosh equipment.