Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

high efficiency easy to drive esl
high efficiency easy to drive esl
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
Thread Tools Search this Thread
Old 29th March 2010, 03:01 AM   #1
pforeman is offline pforeman  United States
diyAudio Member
Join Date: Aug 2008
Default high efficiency easy to drive esl

Always thought my mocode, acoustat 2+2/vandersteen sub... soundedfantastic. Then I made Georges fine single ended triode. What an amp!
I'm wondering if it is possible to make an esl that is at least 93 dB efficient.
I know there are trade offs, and I would be willing to do open baffle bass below ~300Hz.
Some (probably bad) ideas I've had are to have two esl drivers with two tranformers separated with a crossover.
The tweeter module would be about 4" wide, and have a very thin stator to diaphram spacing ~.75mm.
The midrange module would be about 10"wide 1.0mm spacing.
I like the idea of acoustat style cube louver support., and could make it with one panel 4ft tall, or two panels 8ft tall
I won't bother trying, if it isn't possible to make a very efficient esl
My tubelab amp cry's when I hook it up to my acoustats, but sings great when hooked up to some open baffles.
  Reply With Quote
Old 29th March 2010, 07:57 AM   #2
kavermei is offline kavermei  Belgium
diyAudio Member
kavermei's Avatar
Join Date: Jan 2005
Location: Lokeren, Belgium
Send a message via MSN to kavermei
Yes, it is possible, but not easy I think.

* I would suggest a very long, narrow tweeter in a baffle about 5 times the width of the element.
* Try for a very high diaphragm polarization voltage; this will require a very clean construction to avoid HV leakage.
* Use bi-amping and if you need equalization, make it active (before the amp, not after).
* I'm not sure you would really need 2 separate ESL panels for mid and high.

Never send a human to do a machine's job. --Agent Smith
  Reply With Quote
Old 29th March 2010, 08:37 AM   #3
Calvin is offline Calvin  Germany
diyAudio Member
Calvin's Avatar
Join Date: Nov 2004
Location: close to Basel

itībe possible with a hybrid design, but not with a Fullranger.
Still though I suggest at least clean and stable 20W for such a panel.
The problem is that You are limited in several aspects.
First with the level of polarizing voltage. 1.5kV/mm is usually fine, 1.7kV/mm might already give problems under certain atmospheric conditions or lower build quality and 2kV/mm will certainly lead to flashovers.
The second are the large area and small stator-stator distances required for increased efficiency and high SPLs. This leads to high capacitance values which are transformed up quadratically by the audio transformer. So the amp faces a large capacitance as load. A state of affairs most amps are not designed for and with which many canīt cope with.
The third beeing the difficult complex load the amp will see. Depending on the transformer quality the complex power wasted within the amps Power Supply and its Output devices will be several times larger than the real power thatīs used to generate sound. The amp will have to supply for more wattage than it can actually deliver to the speaker...up to 10times more! The weird thing is, that a good Transformer worsens the matters for the amp, because the amp īseesī more of the speakerīs capacitance and less of the transformerīs losses.

  Reply With Quote
Old 29th March 2010, 08:51 AM   #4
geraldfryjr is offline geraldfryjr  United States
diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
So very true ,Clavin,so very true.
I have gotten much better at my typing and appericiate your input on my transformer design if you are willing.
I'm currently working on a system with those dimension.it is not easy getting a proper drive but i have my 3.5"x9.5" sounding pretty good so far. jer

Last edited by geraldfryjr; 29th March 2010 at 09:02 AM.
  Reply With Quote


high efficiency easy to drive eslHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
easy high-efficiency? gongli Full Range 8 22nd January 2010 12:31 AM
Power supply:Universal AC input/ Full range,High Efficiency, and High reliability hang Vendor's Bazaar 12 24th July 2009 04:46 AM
ESL tweeter efficiency blu_line Planars & Exotics 10 23rd May 2007 01:45 PM
DIY super high efficiency/frequency ESL line array thadman Planars & Exotics 17 20th January 2007 09:42 AM
Small and easy ESL amp knubie Tubes / Valves 40 12th March 2006 02:45 PM

New To Site? Need Help?

All times are GMT. The time now is 02:07 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio