Nice one Awsmone;
Those ESL 57's are and will always be the original ESL ever made and designed to date, by the legend himself, Peter Walker.
Although amplifier matching is critical, any well designed amp with stable power supplies and the ability to deliver stable current to handle the notorious impedence swing of full range stats can drive Quads. Then again not all high-end amps are well designed...
These are one of those transducers that will make or break any amplifier.
As you mentioned that you were enjoying your Quads compared to the larger system downstairs; In fact, one of the most enjoyable systems I've ever owned were the ESL63's driven with the CJ Premier 11A, including the Gradient Subs just for added bass augmentation. Quads and CJ are just magical!
The iterations that came after, such as the ESL988, 989, 2805, 2905 (which I also owned) and then the 2912's were ok but nothing to compare to the original 57's, that was the top dog!
Enjoy mate and have a good one. Remember not to over drive them, arcing can occur and will damage the mylar, including a few other failures along the way.... (been there!) Quads are mainly for enjoying the music, not to have a blast.
Cheers to Peter Walker!
RJ