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Quad ESL-63 and low-powered amps; Sun Audio, Atma

Looking for opinions about suitability of low-powered amps with my 63's. I currently have an Audio Note M3 pre, CJ MV-60 amp. Importantly, I cross the Quads at line level at 100 hz, first order with nice Vandersteen MH-5 crossovers to Vandy 2wq subs. So the main amp is relieved of much work below 50 hz or so.

Specifically, I am looking at Atma-sphere s-30 MkII OTL 30 watt amp, and possibly even a Sun Audio 2a3 SET 3 watt amp.

Given my crossover, does this lighten the load (power or impedance) in such a way that these amps would work fine? I imagine the Atma will have no issues, but what about the Sun?

Finally, I would love to hear any opinions about the relative sonic characteristics I might hear between the CJ, Atma and Sun. I listen to 50% acoustic jazz, 25% classical, 25% rock. 60% on vinyl... SOTA w/Grace 714 and Grado Ref Sonata1. CD is CEC transport to Audio Note 3.1 Signature. I value musicality and rich midrange over endless detail and "neutrality".

Thanks all.
montaldo
phillyb's avatar
phillyb
394 posts
 
This speaker will sing with high powered amps, like the McIntosh amps, MC402. The myth is these speakers can work fine with low power amps, even with my subs I use the MC402.
hamr
56 posts
 
I agree with Phillyb, I use Mcintosh MC501's, I tried Mcintosh MC2000, Quicksilver MS190(which were designed on this speaker) , Levinson ML2's, Naim 250 and others. The speaker has a weird impedance load and average sensitivity which is remaining of the amplifier.
hifigeek1
770 posts
 
Three watts is insufficient to drive the Quads. I do not know if an OTL amp would work with the Quads.
mechans
3,048 posts
 
I have heard that the designers of this speaker did not assume lots of watts and amperage abundance. I think you may have to find specialty forums for the info you want or even a brief conversation with Quad themselves.
I am sure the McIntosh amps do a good job and the Quicksilver as well but there may well be other alternatives.
bdp24's avatar
bdp24
9,422 posts
 
As has been said, a low-power amp is not the best mate for the 63. If you want an Atma-Sphere amp, you'll need at least a pair of M60's. Also look into the Music Reference RM-200 tube amp (Michael Fremer "Class A" listing in Stereophile, if you care). Unlike other tube amps, it's power increases into lower impedance loads like the 63.
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