New Flat Speakers Developed - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 17th April 2009, 03:08 PM   #1
jkeny is offline jkeny  Ireland
Banned
 
Join Date: Feb 2007
Location: Dublin
Default New Flat Speakers Developed

Warwick University have developed a flat speaker - I don't know how it differs from the NEXT flat speaker panels but may be f interest to those here http://www2.warwick.ac.uk/newsandeve...205e116e1d7a35

And here: http://www.warwickaudiotech.com/
  Reply With Quote
Old 17th April 2009, 03:31 PM   #2
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
bloody interesting indeed
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 17th April 2009, 04:02 PM   #3
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
No mentioning of bandwidth data, hard to beleive it'll look good.
__________________
Hear the real thing!
  Reply With Quote
Old 17th April 2009, 04:05 PM   #4
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
I like the description of the first prototypes. There are mass and displacement issues and it's not even clear what is the motive technique. 1000's of Volts?
__________________
"This logos holds always but humans always prove unable to understand it, both before hearing it and when they have first heard it."
  Reply With Quote
Old 17th April 2009, 04:38 PM   #5
tvi is offline tvi  Australia
diyAudio Member
 
tvi's Avatar
 
Join Date: Apr 2001
Location: Moonee Ponds, Vic, Australia
Electrostatic audio loudspeakers US patent 7095864.html

"An electrostatic transducer, such as a loudspeaker or microphone, comprises a multi-layer panel (1) incorporating an electrically insulating middle layer (2) sandwiched between first and second electrically conducting outer layers (3, 4). At least one of the layers has a profiled surface (6) where it contacts the surface of another of the layers. Furthermore a signal generator is provided for applying an alternating electrical voltage across the first and second layers (3, 4) to initiate vibration due to variation of the electrostatic forces acting between the layers, thereby serving as a loudspeaker (or for detecting variation of such electrostatic forces due to received vibration in the case of a microphone). Such a transducer can serve as a low cost audio loudspeaker which can be made lightweight and flexible so as to render it suitable for a wide range of applications, for example to provide sound reproduction in a home environment without requiring any bulky enclosure, or in a notebook computer or mobile telephone."

Regards
James
__________________
The small part of ignorance that we arrange and classify we give the name of knowledge.
Ambrose Bierce
  Reply With Quote
Old 17th April 2009, 05:21 PM   #6
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Thanks for that. In 1969 I built David B. Weems' "wild woofer" and CTS had some electrostatic tweeters (exactly as pictured in the patent) for $1 or so each in their catalog. A thin sandwich of felt and some gold sputtered film, I never got the transformer to make them work but the "data sheet" had pictured directly rectified 220 mains as a bias supply.

They use 200V because they are so thin but doesn't that mean the displacement is small? SY?
__________________
"This logos holds always but humans always prove unable to understand it, both before hearing it and when they have first heard it."
  Reply With Quote
Old 17th April 2009, 05:27 PM   #7
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Here is the other thread, same subject

New technology from the UK

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 17th April 2009, 06:52 PM   #8
gedlee is offline gedlee  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Novi, Michigan
Its a good idea. I've long wondered why electro-statics weren't done this way. Its simply an electro-static membrane on a fixed set of substrates. Usually one wants the restoring force to be just the tension in the membrane but thats not necessary. HOWEVER, the efficiency is directly dependent on the stiffness of the insulator and an insulator HAS TO BE stiffer than air. Hence, I'm betting that the resulting transducers are very inefficient. But of course this can be made up for by size. But size is cost and cost is limiting. SO in the end you have just another way to do an electrostatic loudspeaker, but its the same size and cost of its predecessors - no big gains.
  Reply With Quote
Old 17th April 2009, 11:18 PM   #9
jamikl is offline jamikl  Australia
diyAudio Member
 
Join Date: May 2005
Location: Melbourne
Does this have relevance to the discussion going on about biased capacitors in crossovers in the thread of that name?
jamikl
  Reply With Quote
Old 18th April 2009, 10:28 PM   #10
diyAudio Member
 
Join Date: Dec 2004
Location: Mountain View, California
Planet10:

Thanks for linking across to the thread I started in ESLs/alternative

Cheers,

Ed
  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
BoSoZ has developed a hum after 4 years... HooRide Pass Labs 12 10th January 2008 12:18 AM
New flat panel speakers. Ap Multi-Way 0 31st March 2004 12:20 AM
flat panel speakers Mr Hayes Multi-Way 1 26th November 2003 05:25 PM
Flat Panel Speakers (any good?) bobcat190 Multi-Way 12 26th November 2003 04:38 AM
NTX Flat Panel speakers Iceshack Multi-Way 2 9th February 2003 10:15 PM


New To Site? Need Help?

All times are GMT. The time now is 07:18 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