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I'm now a fan of simplification and do passive from one amp. I've tried biamping as I've had many amps at any one time but it was too bothersome and just complicated things too much so I stopped doing it. I have Quad ESL 57's and they are my lifelong reference since 1975. I use them from 100hz up and have regular speaker cloth covering them instead of the metal grills which opens them up and extends the top end considerably. My hearing limit is still 16khz. The quads sit on Morel 9" woofers and I also have 2-16" Altec's in the corners. I use a simple parallel network, coils on the woofers wound myself on laminated cores to the frequency necessary, and caps on the 57's which have a rather complex impedance curve. It took me research and trial & error to figure out the points etc but they integrate into my particular room very well. I've witnessed and been thru measurement rigors but I still use my ears in my room to integrate everything all together. I've done all this to the point that I am not compelled to screw with things and just sit back and listen to the sweetness in the music and not obsess.
BTW for anybody, many years ago I had an xover program (I forget the name) that would allow plugging in all the info and variations you want including a built in database and it had all different kinds of speaker xovers including series. If it's not around anymore I'm sure there is something else.
What amp do you have driving them, S?
A mate of mine has a pair, driven by some lovely Italian tube monoblocs (a mere 18w, I believe).
I understand they are a pretty wicked load - so very few ss amps can handle them?
A real good amp for the QUAD ESL ("57") is the Music Reference RM-10 (Mk.1 or 2). Roger Modjeski used the ESL as his load when developing the RM-10. Roger passed away a few years back, but his assistant (who still runs Roger's business) may have one left to sell, and they occasionally turn up for sale used.
I've had quite a few over the years but I'm down to a pair of Dynaco III's not stock per se, a Quad 405 that has a thorough updated rebuild, and my favorite a relatively unknown Kinergetics pure class A KBA75. I had a Levinson class A at one time but the 75 was just....better, what can I say, it has an effortless authority and clarity and I don't speak a lot of reviewer speak, I just listen.
Nice setup. ESL-57's are on my bucket-list for a listen. I had a short opportunity with ESL-63's many many years ago.
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