Because of the Quads efficiency, impedenance curve or what?I have no experience, but it seems like a relatively poor match unless you sit close and listen at fairly low levels. Be sure to use the 4-ohm tap/version of the ART27A to drive those Quads.
They have fairly low sensitivity and widely varying impedance. A low-power amp driving a low-sensitivity speaker means you need to sit fairly close and/or keep the volume low. They have a high impedance peak at low frequency and fall to pretty low impedance at very high frequencies, like most (if not all) ESLs, so a tube amp with high output impedance will exhibit significant variation in output over frequency. That may or may not matter; it is possible the resulting modified frequency response will be more to your liking.Because of the Quads efficiency, impedenance curve or what?
The CJ default is the 4 ohm wiring. There is only one set of “taps.” If you want something else, you have to rewire the transformer to the taps … an inside job.Be sure to use the 4-ohm tap/version of the ART27A to drive those Quads.
I should add I'm running a pair of Entec 12-F20 subs with the Quads crossed over at 60Hz.The CJ default is the 4 ohm wiring. There is only one set of “taps.” If you want something else, you have to rewire the transformer to the taps … an inside job.
You can have it done at the factory, or you can take it apart and find the wiring diagram for other loads on the transformer.
Regarding the OPs question, CJ would advise buying the ART 108As. The 27A is for smallish rooms with efficient speakers.
Nevertheless, your ears, your system. You might like it.
Yah, that is why I said "tap/version"; probably should have just said "version" but figured a lot of folk might be used to "tap".The CJ default is the 4 ohm wiring. There is only one set of “taps.” If you want something else, you have to rewire the transformer to the taps … an inside job.
You can have it done at the factory, or you can take it apart and find the wiring diagram for other loads on the transformer.
Hmmm... IIRC they would not take as much power as the 63's, but are even less sensitive, so I would still favor a larger amplifier. No point in going over ~100 W, though, as they would self-protect around that point (again, IIRC).IMHO, 63s need at least 100 wpc. 57s are a different story, the ART27 would be wonderful on those.
The 57s were designed for 15 wpc, rebuilt speakers with clamping boards there is no problem going higher. The 63s, to me, sound dead with less than 100 wpc. Again, with updated zenner clamp boards you can safely run 63s harder w/o risk of arcing the panels. I'm on my 6th pair of 57s and owned 2 prs of 63 incl Crosby Mod'd 63 Pros. not my first rodeo re quads.Hmmm... IIRC they would not take as much power as the 63's, but are even less sensitive, so I would still favor a larger amplifier. No point in going over ~100 W, though, as they would self-protect around that point (again, IIRC).
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