Electrostats vs conventional drivers - Page 12 - 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 12th February 2005, 04:19 PM   #111
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
I think that the baffle compensation is the reason for the multiple taps. I haven't measured with anything other than the 1+1 tap, but I'll bet that the first part of the curve, the dipole-cancellation part above the fundamental resonance, is what gets raised and lowered. Of course, the load is changing too as more panels are added, which interacts with the transformer ratio....

Do try to get a couple of panels as the load- I substituted some HV ceramic caps as the load and got very different results as I approached the fundamental resonant frequency of the panels (roughly 100Hz).
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 12th February 2005, 06:43 PM   #112
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
I have panels, but they were not connected to the unit.

Here are the results:

Acoustat 121a interface; no load; 0 db ref 1kHz. (measured ground/CT to one leg of the secondary, both xfmrs & coupling components used)

20Hz. +7
40Hz. +7
100Hz +7
200Hz. +5
500Hz. +2
1kHz. 0
5kHz. -1
10kHz. -1.5
20kHz. -1.5

The HF pot was randomly set by the owner of the unit (it's here for repair - hv section) so that accounts for the minus figures above 1kHz.

The unit was swept, I recorded approximate frequencies of interest... HP ACVTVM recorded the dB levels.

I also dunked in a 0.001ufd and a 0.01ufd as a load to see... no significant change was noted.

The tap was on the Model 4 setting - least "boost" via the LF xfmrs *primary* tap - I got that wrong in the earlier posts.

What's a 1/4 wave at 8"? Seems higher than 150 hz., seat of the pants...

_-_-bear
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
  Reply With Quote
Old 12th February 2005, 06:51 PM   #113
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Well, the total panel width (with overhead) is about a foot. So you'd expect to see cancellation effects centered around 400-500 Hz or so.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 13th February 2005, 03:19 AM   #114
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
Oh... I will double check probably next weekend to make 100% certain that both transformers are working - it's unlikely that they are not, but still a possibility.

_-_-bear
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
  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
FET Switch Isolation using optocouplers instead of conventional gate drivers rtarbell Power Supplies 8 4th February 2011 10:24 PM
Getting high SPL from electrostats. Fanuc Planars & Exotics 21 30th January 2008 07:39 PM
Electrostats bbksv Planars & Exotics 10 8th February 2004 07:45 AM
Subwoofer for electrostats Adam Subwoofers 5 28th December 2001 08:56 PM


New To Site? Need Help?

All times are GMT. The time now is 03:22 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