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Stacked ESL57's -- series or parallel?
Stacked ESL57's -- series or parallel?
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Old 8th November 2018, 01:12 AM   #11
bentoronto is offline bentoronto  Canada
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Stacked ESL57's -- series or parallel?
I don't really know, but it seems inconceivable to have ESLs in series since they have very strange impedance plots and each acts as a voltage divider for the other. Cone drivers are mostly just resistance with some superficial influence moving air and bit of inductance... so series can work.

B.
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Old 8th November 2018, 11:24 PM   #12
mats31 is offline mats31  Sweden
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Yes, I first saw it as almost inconceivable as well, but a voltage divider is a good thing from the input power perspective, since i wanted to reduce the power to a level that is in the right ballpark for the 57s.

Agree the wild impedance plot is troublesome, but with resistors in parallel with each speaker, the voltage division becomes very close to 50% (checked at several frequencies) -- and the impedance plot seen by the amp becomes quite nice...see pics of simulation...impedance and phase plot of a single ESL compared with two 57s in series with resistors in parallel.

Loss of damping factor is also nothing that ESLs worry about...
Attached Images
File Type: png 1XESL57 phase plot.png (281.9 KB, 46 views)
File Type: png 1xesl57 impedance plot.png (285.3 KB, 47 views)
File Type: png 2xESL57 phase plot.png (290.3 KB, 46 views)
File Type: png 2xESL57 impedance plot.png (293.7 KB, 50 views)
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Old 13th November 2018, 08:50 AM   #13
golfnut is offline golfnut  New Zealand
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In principle, you should be able to put them in series or in parallel, and it should make no fundamental difference. However, the power rating is different.

In parallel, the impedance of the pair should be half of the impedance of one - so each should play similarly loud with the same volume setting, but the pair will draw twice the current from the amp.

In series, the impedance of the pair should simply be twice the impedance of one. They should form a perfect voltage divider with half the voltage across each. The advantage is that it will reduce the power (half the current, half the voltage) applied to each speaker by a factor of four.

For example, a single ESL57 connected to a 100W amp is likely to burn its treble section in short notice. Putting two speakers in series will reduce the power applied to each speaker to a nominal 25W (50 W for the pair).

To maintain the good imaging, stack one above the other. The treble section on the ESL57 behaves as a line source and putting one above the other will make the line source longer. The bass will improve a bit.

If they are not one above the other, the system will play like two different sources with unwanted interference effects.

regards
Rod
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Old 13th November 2018, 09:29 AM   #14
soendervig is offline soendervig  Switzerland
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Default stacked Quad 57's

I remember reading an article in a norwegian magazine about an installation of stacked Quad 57's driven by the "Two Channel Poweramplifier " . I'm quite sure a ribbontweeter was mentioned as well , whereas there was no subwoofer involved . I can't remember though , if the article went into any detail about the wiring , series or paralell . Mind you , this would have been around 1979/80....
Wouldn't two stereo-poweramps , each driving its pair of Quads , achieve most of the desired results as well ? Just my two cents ,
cheers

Kim
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Old 13th November 2018, 10:36 AM   #15
bentoronto is offline bentoronto  Canada
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Stacked ESL57's -- series or parallel?
Quote:
Originally Posted by golfnut View Post
In principle, you should be able to put them in series or in parallel, and it should make no fundamental difference. However, the power rating is different.

In series, the impedance of the pair should simply be twice the impedance of one. They should form a perfect voltage divider with half the voltage across each.
Rod is right, again, in theory.

Here's a quick test to see if series wiring (which will make your amp happier) works: set two panels (not 4) up like you'd do for a stereo system. Using just one amp channel, wire in series. Play anything with content at all ends of the freq compass. See if the image is solid dead-centre and stays there.

B.
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