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Old 16th June 2010, 07:41 PM   #81
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Join Date: Jun 2005
Location: Fort Worth, Texas
Originally Posted by bolserst View Post
I should have time to post an updated spreadsheet in a few days which includes the symmetric layout.
Here is Version 2 of the spreadsheet.
Changes are:

1) Added formulas for SPL calcualtions to Notes TAB.
2) Added Reference for line termination to bottom of Directions TAB.
3) Added 3 TABs showing schematics for asymmetric and 2 possible symmetric configurations.

Each of the configuration TABs show R & C values for single ended and symmetric drive of the ESL sections.
Most people use the symmetric drive layout when actually constructing ESLs.
However, for SPICE simulation, the single ended version is more convenient.

When simulating with SPICE, SPL is proportional to:
20*LOG[(total current) / sqrt(frequency)]

Oh, almost forgot to mention... I had protected each TAB just so you didn't accidently mess up one of the formulas. There isn't a password though, so you can unprotect each TAB by simply selecting [Unprotect Sheet] from the [Tools] menu. Then you can change or rearrange things as you see fit.
Attached Files
File Type: zip ESL_line_sectioned_DIY_v2.zip (31.0 KB, 308 views)
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Old 24th June 2010, 09:12 PM   #82
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Join Date: Oct 2009
Location: Hamburg
Default Making ESL's better for people not in the hot seat.

Originally Posted by owenhamburg View Post
Having now owned Quad ESL 57's and Quad ESL 63's I have to say quads combination of filter and delay line in the ESL 63 is very impressive, for improving the treble dispersion. Unless you play with a pair of ESL 63's for a while you would not realize how good they are at treble dispersion because the bass is still very directive.
Having had the Quad ESL 63's for longer now, and experimented with active cross overs its worth giving you all an update.

I have now wired up a cheap bought active cross over at about 100Hz, and now the Quad ESL 63's with the sub woofer are more tolerable off axis. With a cross over of 400Hz the off axis sound is quiet good, improving on conventional speakers with smoothness of an ESL midrange tweeter and suitable for a dinner party, though not ESL perfect. The cross over at 100Hz in my opinion enhances the sound when sitting at the hot seat for best sound, the cross over at 400Hz sounds better when in a Dinner Party situation and is nicer enough that I am not tempted to use conventional speakers.

Before these discoveries I was considering having the ESL63's on Sculpture rotation plates:
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