Amplification for stacked quads?


Hello I have a pair of wonderful stacked ESL 57. Right now I am running them with a pair of EAR 509MKII monoblocks (100WPC) but I am considering Berning's ZH-230 (30 WPC) and the integrated Jadis DA-60 (60WPC). Has anyone had experience with stacked quads? Any recommendations in general? And how about the amps I mention here? Many thanks.
ggavetti
Hi, My stacked quads were driven with the original Ampliwire II from Matti Otala ( Electrocompaniet now) I garee with the above poster the best I've heard the Stacked Q's was with Levinson ML2 monos.

Des
We've had a number of customers with stacked Quads. 57s don't take a lot of power, but with 2 pair in series you can do well with a set of our M-60s.

The speaker really seems to work best with tubes- if you want to hear all its capabilities that is.
Thanks for all your answers. I am still processing. Interestingly, today I got a Sonus Faber Musica for my second system (I have a pair of SF Minima) and just out of curiousity I tried it with the quads...I was actually quite impressed. It's extremely precise and it images like crazy...not bad for something in the $2K range (used).