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

Electrostats vs conventional drivers
Electrostats vs conventional drivers
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
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Electrostats vs conventional drivers
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).
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 12th February 2005, 06:43 PM   #112
bear is offline bear
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
Electrostats vs conventional drivers
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 -- every once in a while I say something that makes sense... ]
  Reply With Quote
Old 12th February 2005, 06:51 PM   #113
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Electrostats vs conventional drivers
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.
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 13th February 2005, 03:19 AM   #114
bear is offline bear
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
Electrostats vs conventional drivers
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 -- every once in a while I say something that makes sense... ]
  Reply With Quote

Reply


Electrostats vs conventional driversHide 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
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 06:00 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki