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 20th November 2012, 02:40 PM   #1
diyAudio Member
 
DeltaStar's Avatar
 
Join Date: Mar 2012
Location: Handel SK
Default combining 2 sets of 2+2's

Hi, Would it be possible to run 2sets of 2+2's off of one amp?
1- The amp will double from 200w to 1600w peak at 100a
2- was thinking of series hook-up where neg of one interface would be hooked to pos of other, this would raise impedence, as oppessed to biwire which would have the impedeance. What are your thoughts on this? Or should I forget the idea? Thanks Al
  Reply With Quote
Old 20th November 2012, 02:58 PM   #2
tyu is online now tyu  United States
diyAudio Member
 
Join Date: Jul 2009
Try it An let us know how it worket....
The Acoustats ESL are hard to get a nuff there just that good....6600 have two 121 infaces on each speaker... other can add there input......good luck
  Reply With Quote
Old 20th November 2012, 06:10 PM   #3
diyAudio Member
 
AcoustatAnswerMan's Avatar
 
Join Date: Feb 2011
Location: Chandler Arizona
Quote:
Originally Posted by DeltaStar View Post
Hi, Would it be possible to run 2sets of 2+2's off of one amp?
1- The amp will double from 200w to 1600w peak at 100a
2- was thinking of series hook-up where neg of one interface would be hooked to pos of other, this would raise impedence, as oppessed to biwire which would have the impedeance. What are your thoughts on this? Or should I forget the idea? Thanks Al
It was always Acoustat's recommendation (as well as my personal advice) not to parallel two interfaces on one amplifier channel. The impedance of one interface can dip below 2-ohms, so paralleling two interfaces will yield an amplifier load of less than 1-ohm. That's bad news for most if not all amplifiers.

An even worse idea is to series-connect two interfaces. Each speaker will be presented with only half the voltage swing from the amplifier, greatly reducing the acoustic output. You will also ruin any damping factor that your amplfier provides.

So, my recommendation is that you need four channels of amplification...there's just no way around the problem. Even Acoustat's legendary Models 6 and 8, which used two interfaces per speaker, were intended to be driven by four independent channels.
  Reply With Quote
Old 20th November 2012, 06:47 PM   #4
diyAudio Member
 
DeltaStar's Avatar
 
Join Date: Mar 2012
Location: Handel SK
Might give it a try parallel , the amp will handle the .7 ohm bass panel of the Apogee Scintilla with no problems, although it's very leaner . Thanks
  Reply With Quote
Old 20th November 2012, 08:14 PM   #5
diyAudio Member
 
Join Date: Aug 2003
Location: Calgary on the Bow
I would not consider doing what you suggest. Acoustat's challenge most amps as it is even big balls to the wall amps and you would be looking at a minimum impedance of just over an ohm, most amps will not be impressed. Just because you have an amp which will drive 3/4 of an ohm does not mean it will sound good doing so there is no point in this exercise. Any amp that could drive such loads that I ever heard did not sound any good doing so. Just because you can does not make it a good idea. They are yours to do with.
When was the last time you ran that amp of yours into less than an ohm? If it has been a good long time I would questions the supplies ability to safely do so now unless it has been updated. Just an after thought. Good luck with this. Best regards Moray James.
__________________
moray james
  Reply With Quote
Old 20th November 2012, 08:34 PM   #6
tyu is online now tyu  United States
diyAudio Member
 
Join Date: Jul 2009
So you say..... The amp will double from 200w to 1600w peak at 100a

... Tell us about this amp.... Never seen one yet....maybe on paper.... But if you dont Drive the amp too hard....you well get sound...
It was M6s i gess i saw...So minny Acoustats an so littel time....Long live Acoutats...good luck
  Reply With Quote
Old 20th November 2012, 10:15 PM   #7
diyAudio Member
 
DeltaStar's Avatar
 
Join Date: Mar 2012
Location: Handel SK
Moray, like to talk to you about upgrades, contact me by email, aawirth@sasktel.net Thanks
The amp is custom built, 2000va of trans and 160000uf,
  Reply With Quote
Old 20th November 2012, 11:37 PM   #8
diyAudio Member
 
DeltaStar's Avatar
 
Join Date: Mar 2012
Location: Handel SK
Is this a stock 121-2a with medalion transformers? Can't believe how clean it is, I bought them new in 1983.
Attached Images
File Type: jpg MK121-2a.jpg (164.6 KB, 75 views)
  Reply With Quote
Old 21st November 2012, 11:58 AM   #9
tyu is online now tyu  United States
diyAudio Member
 
Join Date: Jul 2009
Yes it is A, an from my work on the 121 it is the best..No crossover....all amps to day can drive with ezz,,,,
How ever it the bias that i have found to be the bigest setback today...
I have found that when the base tranfourmer...get driven hard buy a big bass note...it so clost to the bias...you can see here it in your pic... can an dose pull the bias down...makes the panels harder too drive.... Amp get hot...
At one time i thought that adding diodes to the bias setup put it back up to the 5k an it dose...but the bias needs to be outboared ..i have done this an set the bias up so you can set it youself. from 5-7k....this brangs the Acoustat up to todays real would ESLs...i put a new bias setup anginst any ESL...SoundLabe...you name them i had most.....After all a ESL is only as good as it bias an panels an jIM GOT THE PANEL RIGHT...
you can see the B type has a crossover on the high frc.trafourmers input ...An C adds even more crossover in front of the sound like 16 ohms 50watt............ some say it better...but to MY EARs... it just a Fix for the amp driving the ESL ezer....today it not needed....................good luck
Attached Images
File Type: jpg Untitled01.jpg (22.9 KB, 9 views)
File Type: jpg Copy (2) of ACOUSTAT%2520SCHEMATICS-NO%2520POT[1][1].jpg (99.4 KB, 58 views)

Last edited by tyu; 21st November 2012 at 12:01 PM.
  Reply With Quote
Old 24th November 2012, 05:43 AM   #10
diyAudio Member
 
Join Date: Aug 2003
Location: Calgary on the Bow
Hey buddy: I never did notice what you described happening or was not aware of it. In all my Acoustats I placed copper or aluminum foil shields around the transformer windings which I grounded. Good observation on your part, thanks for posting that Allan. Best regards Moray James.
__________________
moray james
  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
Acoustat 2+2's Mercury3 Planars & Exotics 44 24th December 2011 10:27 PM
Possible? Combining two sets of speakers for computer audio. UnknownOrigin Digital Source 0 17th March 2004 01:05 AM
Old Aleph 1.2's Nickolas K. Pass Labs 31 8th July 2003 06:28 PM
New Aleph 1.2's jewilson Pass Labs 8 4th July 2003 05:01 AM
Aleph 2's Underway! Mark A. Gulbrandsen Pass Labs 41 10th October 2002 02:59 AM


New To Site? Need Help?

All times are GMT. The time now is 03:43 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