SOUNDLAB ULTIMATE 545

If you can get CAT amps do it! And their preamp is also excellent.
Your 545s deserve the best! And I believe they will be a great match with the SLs.

I’ve been involved with SoundLabs since 1999 and in my experience Atma-Sphere amps are an especially good match with them.

As a new dealer I was frustrated that SoundLab wasn’t giving me an amplifier recommendation. So I asked a different question: What amplifier manufacturers have you shown with? Well that was the right question - they went off about Atma-Sphere, so that was the first amplifier line I added, and twenty plus years later is still my first choice.

Duke
dealer disclaimer

Thanks a lot for your help.
jperrry-I´ve not heard U-545 with my Gryphon, because they are on the way.
Obviously, I´ll use my Amp, but I want to be informed about "valve sound" to feed the best way this -for me- special speakers.
Today I´ve ML Aerius, but they are hybrid concept, and I really want to enjoy pure ELS.
mglik-  you mean JL-5 or JL-7?
audiokinesis- can you tell the Atma model you´re using?

Two of my reviews at Dagogo.com that you might enjoy:

Sound Lab Ultimate 545 (at the time called U4iA)
Legacy Audio i.V4 Ultra Amplifier 

Pinotnoir, either the MA-1 or the MA-2 would work well with your speakers. SoundLab has shown with both models, and my understanding is that, of the two, they more recently showed with the MA-1s at Rocky Mountain Audio Fest.

By the way, congratulations on your 545's!!

Duke