I have had these speakers for years and never heard any metallical coloration. Don’t even know what it is.
get great transparency to musical performance, electrostatic clarity in the midrange, but better on the extremes... near horn dynamics... just pure joy
They do need a room with a lot of absorptive and reflective surfaces. If the room is not up to par, it’s bad news... a lot of guys use SMT wings to delay the waves that come from alll over and help with imaging ...
amp-wise, if someone doesn’t use MBL amps because of Ss allergies, cost, or something else, the consensus best is symphonic line kraft, which is the least ss sounding amp ever...may be used with a tube preamp, which is a great thing to many.., the others amps sound soft and can’t get the melon to sound right.. most amps sound like a pussy....and I’ve lifted a lot of amps before , screwed over my back, cut my hands... just knocked off the toe nail on the big toe... hurts like a b!tch, ouch!!!
like everything else , it’s about personal preference in this hobby. Things move you or don’t.
Add VAC to the list. I had VAC to drive MBL 101 before. I have said many times before. VAC 450 drives 101 better than 9011. Much more dynamics and musical. Problem is that tubes keep blowing.