Amp Upgrade time, $6000 budget, used or new.

Soundstage = Ayre :-) but lots of very very fine amps mentioned 

When I spend that kind of dough, I won’t do it without a home audition and right of return. That lets out most used gear. I am using Janszen hybrid electrostatics, and I don't want a harsh amp to take away from their beauty.

If you can take the copious heat, a Pass Labs X250.8 would meet your sound profile. Pass recommended (to me) the X series as better suited than the XA for electrostats. Reno HiFi often has demo units at about 20% above your price point, and they will take it back if you don’t like it.

I auditioned that amp, enjoyed the slightly lush and very atmospheric sound, and sent it back because the heat was too much for my small room. As @asa said, Pass Labs amps are widely loved and hold value.

I auditioned the Magtech, too, which to my ears had a chillier sound profile. (I know many hear perfection in it; and I agree Mr Sanders is a genius and great to do business with.) I decided on a Bryston 4B3, with sound somewhere in between the two. I am very happy with that, so I should include it in my list, though it has less snob appeal than Pass. Bryston these days has a far less up-front sound than previously.

Wow thanks y’all. I’ve got an email in to sanders, I’m also going to look at pass and Bryston. That dna on audiomart looks awesome too 

I would look at the Aesthetix Atlas. It should give you what you are looking for.

andrewkelley
What’s the most badass amp I can get for $6000 New or used.
my Martin Logan’s

From experience nothing for the money will touch these on ML ESL's 
A used pair of Parasound John Curl Halo JC1’s run in high bias mode, for serious listening, low bias mode for non serious. here are just 4 pairs in the US.

https://www.audiogon.com/listings/lisa0gci-parasound-halo-jc1-mono-power-amplifier-silver-pair-jc-1-fully-serviced-23549-solid-state

https://www.audiogon.com/listings/lis9jf11-parasound-new-classic-model-2125-v2-open-box-solid-state

https://www.ebay.com/itm/Parasound-Halo-JC1-Mono-Power-Amplifier-Black-Pair-JC-1/324159151984?hash=item4b79641f70:g:jgkAAOSwKgZetIxT

https://www.ebay.com/itm/Parasound-HALO-JC-1-Monoblocks/303564412667?hash=item46add956fb:g:3D8AAOSw249euOFG


Cheers George