Make it worse to make it better??? - Page 3 - 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 9th May 2008, 08:05 PM   #21
diyAudio Member
 
Join Date: Nov 2005
Default Symmetry ...

Hunt, in "Electroacoustics" addresses the issue of a lack of symmetry. One of the assumptions made at the outset of his analysis of the push-pull case is symmetrical positioning of the stators relative to the central diaphragm. He goes on to show the diappearence of distortion terms due to this symmetry in his mathematical analysis... Near the end of all of this, he states that distortion remains below 1% for capacitance differences between the two halves of 8% ...
  Reply With Quote
Old 10th May 2008, 05:13 PM   #22
diyAudio Member
 
Join Date: Aug 2003
Location: Calgary on the Bow
Default thanks for the reference to Hunt...

there are a fair number of different patents to generate the voltage for a diaphragm from the audio component. Most of these are for esl headphones but some are specific to loudspeakers. Perhaps one of those would provide a way to insert some audio into the polarizing voltage.
__________________
moray james
  Reply With Quote
Old 12th May 2008, 09:15 AM   #23
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

I havenīt read all the answers, but MJ Your assumption is wrong under the following circumstances:
1st: between the plates exists a homogenous field and
2nd: the ESL is a constant charge device
This is the way most modern ESLs are constructed.

With these premises in mind the actual position of the membrane plays no role. Keep in mind that the application of a polarizing voltage offsets the membrane from the centered position anyway.
ML works successfully with different front-to-back-stator-d/s, so do I. Imbalances of up to 25% donīt effect distortion values consioderably.

As for curved stators I canīt agree with You. My experience is that distortion is rather a matter of excursion and the transformer quality rather than curvature or flatness.
If You want distortion let the panel work with low frequency content below 150Hz and use a small cored tranny driven into saturation.

As for my panels I even couldnīt state how much of the measured distortion value is actually added by the measuring setup and how high is the effective value of the tranny and the panel.
In any way the larger panel was measured with less than 0.2%@95dB@4m above 100Hz and the smaller one limits above 110dB@4m, measuring less than 0.3% above 200Hz. Both panels distortion mainly consists of K2.


@ELīOL
The new Final are constant voltage devices with a inherently non linear drive system...a proven way to generate distortion...so thereīs no need to modify them at all
"BTW, what I find boring about ESLs is mainly the transients and the poor integration with a dynamic bass. I would like to listen to a magnetic planar (not a muddy maggie) with ESL midrange."
Those who listened to my systems were atonished about the reproduction of transients and the good integration of bass ;-)
Dynamics like a big horn system combined with the exceptional precision and resolution of ESLs, combined with the seemingless integration of bass like a FR.
One of the reasons is to have a highly efficient panel crossed over not too low to a dipole bass (which measured below 0.2% distortion above 25Hz @95dB@4m too!) ;-)

I must admit though that it sounds best, when a SE triode amp wo. feedback is driving the panels ;-)

jauu
Calvin
  Reply With Quote
Old 12th May 2008, 11:08 AM   #24
el`Ol is offline el`Ol  Germany
diyAudio Member
 
Join Date: May 2005
Location: Bavarian Forest
Quote:
Originally posted by Calvin

Those who listened to my systems were atonished about the reproduction of transients and the good integration of bass ;-)
Dynamics like a big horn system combined with the exceptional precision and resolution of ESLs, combined with the seemingless integration of bass like a FR.

I admit it is problematic to generalize with my very limited listening experience.
  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
want to make 1st EZ car sub,, pls help James Tharp Car Audio 3 2nd June 2005 05:33 PM
How make make a microchip, from a program? multiplexor Everything Else 1 20th February 2004 01:24 PM


New To Site? Need Help?

All times are GMT. The time now is 06:40 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2