I recently acquired used Martin Logan's Esl they are paired with Mcintosh MA6900 Integerated Amp with Jolida 100 vacuum tube CD player loving the sound the sound imaging is excellent and love to be here on the forum.
Congratulations. "Warmth" is dependent on many variables in your equipment chain. There is a discussion on another thread whether monoblocks vs stereo amps worth it.
I would recommend getting comfortable with the sound , especially since you are enjoying it. You can experiment w/ placement, room treatments, etc and may be surprised.
Also, I believe you have tone controls on your Mac so would experiment with those.
Look around here. There is a wealth of information.
Thanks for the advice you are right at the moment enjoying the sound will play around with placement and adding room treatments will surely make the experience better... once again thanks will go through threads and look for more informations