Tough speakers! but they shine with the Krell KSA250's or the old Levinsons! An uncle tried it with the older Carver, Perreaux, even the Mac and no luck! you need muscle in this speaker!
I'm really not a Krell lover, but I have to admit that a KSA300 is probably the best amp for these (or any other non-hybrid) Apogees. Don't like the Krells with other speakers I've owned or heard, but they do sound pretty good with Apogees. Good luck -- nice classic speaker -- replacement ribbons are now available from a chap in Australia. Check out the Apogee newsgroup. Good resource for owners of "orphan" speakers.
Agree on Classe (esp.) & Krell, both in heavyweight version (not discount amper. / 80 W, etc). In another vein, I spent a happy 2 yrs powering my Calipers with EAR 519 (albeit with upgraded capac/rs in the power supply). Phill is right about cabling: use clear and FAST and with monos, SHORT!
Forgot about an amp that should work very well with the Calipers (or any other non-hybrid Apogee). Check out the Innersound amp. This was designed to power their own esl's. Unlimited headroom, loads of current and voltage. All the things that your speakers need. Supposed to sound quite musical, to boot. Innersound has a site with info about their products.
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