Has anyone tried ESL63 connected in parallel and use with 4 ohm tap from tube amp? Or should I have 2 sets of poweramp instead. Please share your experience. Thanks.
In theory, sure.
You'd want to look at the impedance curve for the speaker and then divide the values shown by 2, then if the amp is stable into such a load AND that Z you have calculated is within the SOA of the amp, you're ok.
The real problem with doing this is that the 63 acts like a "point source" in that the delay lines cause an approximation of a spherical wave from the flat surface. Now, if you stack two, you have two spherical waves which will now interfere based upon the distance between the two vs. frequency.
I understand that what is done is to limit the high frequency response of one of the two speakers so that the resulting polar response remains clean. That would be a fairly low frequency, making one a full range and the other more or less a woofer.
Ymmv.
_-_-
You'd want to look at the impedance curve for the speaker and then divide the values shown by 2, then if the amp is stable into such a load AND that Z you have calculated is within the SOA of the amp, you're ok.
The real problem with doing this is that the 63 acts like a "point source" in that the delay lines cause an approximation of a spherical wave from the flat surface. Now, if you stack two, you have two spherical waves which will now interfere based upon the distance between the two vs. frequency.
I understand that what is done is to limit the high frequency response of one of the two speakers so that the resulting polar response remains clean. That would be a fairly low frequency, making one a full range and the other more or less a woofer.
Ymmv.
_-_-
If your more technically inclined you could make one large ESL out of 2 speakers. Using 4 rather than 2 bass panels, per speaker.
The cheapest way to do this, is buy 4 new bass panels from Quad and wire them in parallel with the current bass panels.
The cheapest way to do this, is buy 4 new bass panels from Quad and wire them in parallel with the current bass panels.
For a long time, I've been thinking about creating a wall of sound using a large box full of old Dayton-Wright cells I have sitting around. Seems self-evident to me, Blumlein's math not withstanding, that four Quads make a really swell wall of sound. For sure, a centre-speaker, as Paul Klipsch advocated, has to make a lot of obvious sense.... once you think about it. Granted, seems both obvious conceptually and weird in terms of the history of stereo. Not to me, I spent a lot of my youth in a mono world.
I've never experimented and never posted on this concept so I can't say just what signal you'd put into the middle two speakers to get the best sound. I keep my two panels far from the walls and almost together and get the best room filling sound and no grating ping-pong effect (which, of course you never get in real life). I bet four Quads wold sound wonderful... but in a horizontal array, not stacked.
BTW, the whole matter of beaming is thought about from the point of view of a textbook diagram and from the speakers point of view. It just doesn't mean much from a listener's point of view. What does matter (and here I have been reading Toole's recent AES free article) is the nature of the sound reaching you directly plus the sound off the walls. Speaker dispersion and room acoustics define both of those, but not beaming taken alone, as in "the darn speaker is beaming at me again".
Ben
I've never experimented and never posted on this concept so I can't say just what signal you'd put into the middle two speakers to get the best sound. I keep my two panels far from the walls and almost together and get the best room filling sound and no grating ping-pong effect (which, of course you never get in real life). I bet four Quads wold sound wonderful... but in a horizontal array, not stacked.
BTW, the whole matter of beaming is thought about from the point of view of a textbook diagram and from the speakers point of view. It just doesn't mean much from a listener's point of view. What does matter (and here I have been reading Toole's recent AES free article) is the nature of the sound reaching you directly plus the sound off the walls. Speaker dispersion and room acoustics define both of those, but not beaming taken alone, as in "the darn speaker is beaming at me again".
Ben
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