Stacked pair of Quad ESL 57 - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th December 2011, 12:31 AM   #11
AVWERK is offline AVWERK  United States
diyAudio Member
 
Join Date: Jan 2004
Location: So Calif.
I have toyed with this idea many years and never did this based on the resulting image issues, but the central ribbon or even a 3/4" ceramic coated dome idea should result in a better focused image.
Hooking one up with a simple 6th cap and L pad would prove interesting.
One thing about the quads that make them special is the incredible downward dynamic range that eclipses most other electrostatics. While they have limited overall dynamics they make up for it going the other direction.
That stack must surely cure any issues on dynamics!
Did you series or parallel these?

Regards
David
  Reply With Quote
Old 5th December 2011, 01:01 PM   #12
diyAudio Member
 
Join Date: May 2006
Location: Netherlands
The Quads were run in parallel. We should have tried series connection (on the 300B) but didn't.

I think the sounds stage issue is a matter of setup and distance to the speakers. If you have enough distance then, theoretically, there should not be too much difference between a single pair and a double pair. Unfortunately we had a busy program and lots of people wanted to audition the stacked Quads, so once they were set up there was little time to play around and experiment.

At my place I don't have the space to put them up. I'm going to do a series of measurements on a mono stack and probably sell the frames after that.
__________________
my Quad ESL website.
  Reply With Quote
Old 5th December 2011, 09:00 PM   #13
a.wayne is offline a.wayne  United States
Sin Bin
 
Join Date: May 2008
Location: Front Row Center
Welcome arend-jan ...... nice to see.....
  Reply With Quote
Old 11th April 2012, 10:58 PM   #14
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
I've been browsing where I normally don't and came across this thread and thought a zombie post was in order.

I've been running stacked quads for a while now, powered from a rebuilt ST70 with KT66s. My room is nowhere near as big as the one shown, and I tend to sit fairly close to the panels. I have found that positioning is very important - an inch or 2 is all it takes to throw it off. Probably more fussy than a single set.

I use a nordost set up disc that I picked up at a show. It has a useful set of tones that pan up and across the stereo image - they are very useful for working out distance and toe in. The other thing that I think is very important is the rake - I have found that having the panels dead vertical sounds best - I've tried everything from the "standard" angle to "falling forward" and vertical works very well for my room at least. This can be awkward to try out, but its worth it.

One of my sets is from 1974 (never serviced afaik) and the other set are very early, from 1959, serviced by quad in 1981. I know they are probably not at their best now but can't bring myself to tear them down to service them! Foolish maybe...

Arend-jan - what was the chipamp you mentioned in the post? I tried running them from an F5 but that combination didn't err, get on. Burn out resistors in the F5!

Fran
  Reply With Quote
Old 12th April 2012, 06:57 AM   #15
diyAudio Member
 
Join Date: May 2006
Location: Netherlands
Hi Fran,

I've been thinking about this and I think set-up becomes more difficult when you are in a smaller room and close to the speakers. It was not as critical as I expected it to be in this large room. In fact it was easier than a single pair in a small room. But I must admit I did not fiddle with it endlessly to get the most out of them, when it was good enough it was good enough.

When you say having the panels dead vertical, do you mean you removed the panels from their original frames and mounted them flat in a custom frame?

The amplifier that we used was the Tentlabs b-amp that comes to the market this summer. Very nice indeed!
  Reply With Quote
Old 12th April 2012, 07:46 AM   #16
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
You might well be right on the setup in a smaller room. I also have an issue with so boominess in that room that was greatly reduced by the careful positioning. On the whole though, the stacked pair sound better than a single set.

No, I haven't removed the panels from the speaker, just that the whole speaker is vertical in the frame - and the frame is also vertical. I originally built my frames with a rake of about 10deg off vertical, but later experiments led me to change to vertical.

I haven't tried wiring them in series - must try that now, plus I must try my lm3875 chipamp too...

Fran
  Reply With Quote
Old 12th April 2012, 07:26 PM   #17
a.wayne is offline a.wayne  United States
Sin Bin
 
Join Date: May 2008
Location: Front Row Center
Fooling around stacked Quads from as way back as the 70's. Stacked quads need room, If you are using a small room , be prepared to treat the room Diffusers is a necessity . Here's a pic of a friends recent setup , the room is full of diffusers and it is actually a pretty big room..

Triple need seating position 18 ft away ...
Attached Images
File Type: jpg Picture 005.jpg (386.8 KB, 338 views)

Last edited by a.wayne; 12th April 2012 at 07:29 PM.
  Reply With Quote
Old 12th April 2012, 07:51 PM   #18
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Seeing as we're sharing..... Here's a rather poor phone camera shot of mine.


I switched to series wiring today - and it's quite an improvement! I used the 16r taps on the st70, might go back now and give the F5 another run, and also the lm3875 chipamp too.


Fran
Attached Images
File Type: jpg IMAG0190.jpg (154.5 KB, 279 views)

Last edited by woodturner-fran; 12th April 2012 at 08:01 PM.
  Reply With Quote
Old 12th April 2012, 09:19 PM   #19
a.wayne is offline a.wayne  United States
Sin Bin
 
Join Date: May 2008
Location: Front Row Center
You need an 1 ohm tap if running in parallel , 2 ohm if running in series for good top end ...
  Reply With Quote
Old 12th April 2012, 10:36 PM   #20
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Ah sure no-one would have those taps available unless you did some kind of custom build. The sound improved a bit with the series winding (sounded better on 16R taps rather than 8R too), so it must be a bit easier on the amp/better match. Going to do some more experiments tomorrow....
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Refurbing Quad ESL-57....Some Queries! Fanuc Planars & Exotics 14 2nd January 2012 11:12 AM
Quad ESL 57 connection discurio Planars & Exotics 3 20th April 2011 02:25 AM
QuAD ESL 57 Question dude007 Planars & Exotics 30 5th March 2010 07:45 PM
QuAD ESL 57 in a small room? dude007 Planars & Exotics 3 26th November 2007 02:22 PM
Quad ESL-57 (pair) TimA Swap Meet 2 14th November 2005 11:34 AM


New To Site? Need Help?

All times are GMT. The time now is 07:06 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2