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Old 5th November 2015, 02:10 AM   #1
tyu is offline tyu  United States
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Join Date: Jul 2009
Default All Acoustat panels can give

Lot been said here on this site about Acoustat ESLs....
But I have had Acoustat panels an interfaces ....around/playing.....over 25years
Lot magic ...Voodoo..mods-tweeks.....on panels... make them a solid grid......SO the mixers don't have to drive a open wire....upgreaded parts...adjustable outboard bias 4-7k...panels just lad in frames, screws

But one thing I have Never done... is run the panels open ....fronts an backs
No stock!
...Martinlogan gets a good 3 more db out of there panels all open
An I know people that drive there stock Acoutats with Dynaco 35 watt tube amps.....or other small tube amps.....
So if we can get 3 more db backet....we can get better /more output .....less drive is need....looks like a win-win...

So I have M3s setup...3 9"panels I have opened the panel on the inside
in each speaker...
Big tone....lot more of the magic......biger stage...image....more bal/even sound.....this can be done on any ESL panels.....Acoustat,quad 57s/63 not sure
Sound back.....see pic...

So now with the help of others.....

why is this a bad thing??.......
is it bad for the interfaces?.......
Bad for the panels?
dose it make the amp work harder?
what the down side?
An then there this...........has anyone lived with open front an back Acoustat panel?.........................why not?......
an for the diyers anyone put backing on the back of there ESL panels?

After all this time for me..... with ESLs ... Acoustat still have more of there magic too give...........
thanks for any an all info on ESLs
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Old 5th November 2015, 03:04 PM   #2
tyu is offline tyu  United States
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Join Date: Jul 2009
For this setup ....I have started...... with a 200mf cap ..... on the input of the M3s 121 interfaces....this sets a 6db type crossover.....with the all open panels ...theres still a lot of lower bass coming from the sound for the frist time 100% output... of the panels ..... with the baking off all 3 panels. now.....
No ESL I have ever heard.... have give this type of
Big ....massive sound!, texture sound.... its like the missing link!
Having any type of Backing on the one way.... if the room is Big full bass!......nothing bad about that......right?
but at what cost..........lot of lost magic...

Looks like most of the noise these panels make comes from the stock felt on the back....buzzs....Mylar slaping....over load....
big part comes from the way we mount the panels in a frame...........the stock MDF...that can smears the sound.....
unlike real wood.... that would turn most unwonted resonant to heat an it wood... pull away from the feeds back on the panels ...any resonant from the room....interfaces box.... or the Amp driving the interfaces.....

Like seting up a outboard Adjustable Bias .....if anyone hears how much just a little more are less bias can make on the sound....all would have one!

One BAD thing about this panel may never go to go back to the stock setup!
but for myself this give so much better sound....Big tone....anyone would say ..hear what I have been missing.......
If we were at 80% ....of the best sound from stock setup Acoustats..........
this is a ezey 40 more %.......
Vary ezey mod for anyone to can always go back.....
Acoustat just keep getting better......where the competition......way up there $$$$$
Long Live Acoustat Panels......

Last edited by tyu; 5th November 2015 at 03:17 PM.
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Old 8th November 2015, 02:03 PM   #3
tyu is offline tyu  United States
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Runing the Acoustat 121 interfaces.... more are less as Jim Strickland setup the Spectra interfaces.... not to give full the bass response......... if you look at the Spectra mixer schematics posted here you well see that the first res that feeds all the panels output res is 100k....with the .01 6k cap.....this is the Spectra fulrang output tap...
I have the Spectra even when the 100mf cap at the input is bypast..there still no where near the low bass output of the older 121 setups......even if all the Spectra panels input are all ran from the fullrang output point............this is how I run my Spectra just sounds better to me......but I have lived with the sound of older Acoustat for over 25 years
An yes I know the 2123 interfaces use diff transfourmers than the 121.
but this is what I hear......when there setup side by side........

The Acoustat 121 interfaces uses a 50k res an the same 01. 6k cap in that same spot in the mixer as the 100k 0.1 6k cap in the Spectra
this 50k res lowers the frc ...vary low....if the 121 50k is replaced with 100k.. you lose lower bass output.....then if you add the 100mf cap on the will move the crossover point up to above 100hz just like the Spectra...
All the Spectra interfaces mixers setup were made to have a 8"-10" driver in the setup to fill in the missing low .....

Now runing the 121...2123 this way with less lower pulling the felt are any backing of the panels well give .....I say about 30-40% more output way better sound.. more even frc response in the room.....that well shock anyone that hears this setup...Apogee,Magnepan,MartinLogan were always my fall back speakers.... vary closes sound to the Acoustats with mods......
this yes Voodoo magic..the sound with all open the other speakers.... there not even close!

Getting good bass today is so ezey.....
jim new there were BIG gains in Spectra 2123 mixer setups sound .....with a littel less bass on the panels .........better lower mid....upper much better topend
is worth a littel less bass output......from these panels ....this IS the sound I have been looking for........................
All just one ESL lovers finding......
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Old 28th November 2015, 12:02 AM   #4
harryz is offline harryz  United States
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Location: Portland, OR
Default Very interesting

I recently bought some modded Acoustats that were probably model 4s, originally. Interfaces are modded Medallion reds with fuses and chokes (?) removed from the circuit, but still there. One 8" and one 9" panel side by side and stacked like 2+2s, and no back felt. I love the sound but they can boom on some material, even though they are 4' from the back wall in my room.

I want to have the interfaces restored to stock, so will try your mods. Seems to make more sense than tube traps or adding felt back to the rear of the panels...

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Old 28th November 2015, 11:26 AM   #5
tyu is offline tyu  United States
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"can boom on some material, even though they are 4' from the back wall in my room".

Only the model X,3,4,6,8s.....use the 8" panels....with the Xs-1+1-2+2s type setups
...when panels set on the floor... this adds to much bass reinforcement well be hard to get them sound right....without backing..
Use paper tape.....
you well not lose it ezey to add an remove as needed to tune the panels sound..
the stock felt eats topend...... if you back off the panels well get more an better sound.... stock felt backing an to tight screws ....well add uneeded panel mass....

Running your panels full range.......adding paper tape on the panels back.. the panels won't over well sound better.............good luck
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Old 28th November 2015, 01:45 PM   #6
harryz is offline harryz  United States
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Thanks. I will buy some paper tape to try today.

Harry Z
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Old 28th November 2015, 03:04 PM   #7
tyu is offline tyu  United States
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Yes paper tape.... small price to pay ...if you don't like..take it off....
let us know what you think...find...thanks
I was playing with adding more the topend output increases... the more you add...but then you got back off...get to be to much..tune it to you room.....
I think the tape sounds vary close to the sound of the plastic...mylar in the adds low mass ...but dappens just a nuf....
My setup is M3...flat....3ea 9" 8"...12"off the on the more place to pic up better sound an output.....most stock setups have closed in bottems under the panels....this cuts about 30% of the output.....sounds nuts but....
just like most mods.........people say ....NO WAY...then thay hear.... the Voodoo say I never go back..........have fun...
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Old 28th November 2015, 06:07 PM   #8
harryz is offline harryz  United States
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So far,so good. Will try more on the bottom panels shortly. Thanks
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Old 4th December 2015, 02:50 PM   #9
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I have been experimenting with the felt on my Spectra 22 for a few months now. I have found that the bass only outer panels really need some felt backing on them or the bass does not sound quite right. Can't really explain better than that, the bass is still there with tape only but doesn't sound.....quite right. Since these panels in my set up do not produce any high frequencies, I have glued all three felt pieces back.
The other panels, which do produce high frequencies in the Spectra setup, sound better with some of the felt replaced with masking tape. More extended and open sounding. Currently using only the larger felt on these panels, with the smaller pieces above and bellow replaced by masking tape. I have not tried removing the tape entirely and may do so now that I read tyu's report.
I think a lot of this depends on the size of the room (mine is small only 12 X 16 feet so I listen in a near field set up) and the amount of panels per side you are running. Also depends on whether your panels are running full range or in Spectra configuration. Needless to say, the felt pads have a big influence on the sound and experimentation is free and easy and very worthwhile.
I don't know if its the changes in the felt, the loosening of the bolts, the break in of caps and parts on my renovated interfaces, the new 6kv bias supply, etc. but the sound I am getting from these 25+ year old speakers is really amazing. These things are like a microscope on my system, every change I make, from tube rolling to contact cleaning to VTA changes on the turntable is easy to hear and judge. Details in the music I had not heard before on my Totem Hawks are found on just about every album, many that I have played 100s of times. The bass in very good, just wish it had a little more punch (I know I'm being greedy). I would add subs at the bottom, but the cost for the subs and a crossover of high enough quality to satisfy me would probably be 3 or 4 times what I have spent on the speakers.
Long live Acoustat!
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Old 4th December 2015, 03:26 PM   #10
WrineX is offline WrineX  Netherlands
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damping the resonance is useful, i dont know how much acoustat rely on extending the low frequency with the resonance frequency. over damping will make it then sound thin, but can harm higher frequency as well. tobad noone ever tries nylon mesh on the inside to get rid of the resonance at least a bit and not use the felt and potential harm higher frequencies. ofc this all is almost impossible to determin without any measurements
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