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In Reply to: RE: Classes DR-2 for stacked ESL 57? posted by Satie on April 27, 2017 at 18:34:38
He also claimed that the Gradient SW-D / double Quad ESL 57 combo sounds better than 4 × ESL in stacking.
But it has another issue, whether allow uses different amp to drive the Gradient SW-D as it demands more control from the amp for four 12" dipole bass drivers per channel.
Follow Ups:
I would have used the Gradients with a biamp setup. Didn't even occur to me you would want to integrate it passively. But yes, you could run it with the Gradient's passive crossover and get the benefit you are after not to choke the DR2 on high impedances of the ESL Bass. But the DR2 is a more powerful amp than its specs imply.
I meant amplifier other than Classe Dr2 for the Gradient woofer tower, however I worried it'll have another issue --- coherent.
As those 12" woofers required more power to drive than the Quad panels.
If the Quad mate with the Gradient, the stacked Quad only have to play above 110Hz, what is the nominal impedances will be as the high impedance portion would be hand over to the Gradient through the cutoff by the electronic crossover?
I expected it will be pretty low especially for stacking.
The biamping approach is by far better here. The top amp and the speaker will not see much energy in the high impedance section of the quad panels because they are not pushing much energy at those frequencies so are not getting the speaker's reactance below the XO point.
As to the preferred amps for the gradient subs I suggest you look at forum discussions on the gradients. There have been a few elsewhere but I don't recall a detailed one here,, at least not in the last decade. But it is worth a try to search here too.
What is the nominal impedance of Quad ESL 57 with 110Hz cutoff by the electronic crossover? I guess it will be much lower without the "very high" portion.
Actually it looks like a slightly higher crossover freq would help more since you still have 20ohm impedance at 110 hz. So something closer to 200 hz would be a great help to the DR2 operating as a mid/tweeter amp. but even at 110 hz the crossover cuts off the very high impedance portion.
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