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Old 18th April 2017, 09:56 PM   #1741
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Quote:
Originally Posted by Jrimer View Post
I just bought a pair of Acoustat 1's and they do not do this in the same space. I believe it is related to the size and shape of the room (22' wide x 60' long x 30' tall). Even with the servo amps I'm getting this effect.
What kind of Spandex did you use for your grille cloths? I've been wanting to try this. Someone once mentioned a thinner grade of Spandex works better.
I love the naked look
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Old 21st April 2017, 09:41 AM   #1742
tyu is offline tyu  United States
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I just have to asked...
If Blue is the positive as seen in the 121 Schematic ....
why is it called the positive if its the back panels wire....?
It like my Acoustat play louder out the back....
As always thanks for any an all info on Acoustats are any ESLs...
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Old 21st April 2017, 07:14 PM   #1743
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Quote:
Originally Posted by tyu View Post
I just have to asked...
If Blue is the positive as seen in the 121 Schematic ....
why is it called the positive if its the back panels wire....?
It like my Acoustat play louder out the back....
As always thanks for any an all info on Acoustats are any ESLs...
The blue wire goes to the rear stator grid, correct. It is at positive phase (or in-phase with respect to the incoming audio signal), so that when the audio signal is positive-going, the positive electric field on the rear stator grid will oppose the positive electric field on the diaphragm, causing the diaphragm to move away from the rear stator, or towards the front of the speaker.

At the same time, the front stator is negative phase (or out-of-phase with respect to the incoming audio signal), and therefore the negative electric field on the front stator grid will attract the positive electric field on the diaphragm, causing the diaphragm to move towards the front stator, or towards the front of the speaker. Hence, the speaker preserves absolute polarity, where a positive-going input signal causes the diaphragm to move forward.

The opposite scenario happens when the audio signal is negative-going, causing the diaphragm to move towards the rear of the speaker. A simple push-pull system, whereby the diaphragm is always under equal driving force regardless of its position within the gap.

As to why your speakers "play louder out the back" I cannot fathom why that would be, unless caused by a defective interface or room acoustics.
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Old 21st April 2017, 08:43 PM   #1744
tyu is offline tyu  United States
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I posted this question ....Because I know most, like over 98% of people never have seen were the blue wire goes on there Acoustat panels.....
For years have found the blue wire moved to the front, an white moved to the rear, on any ESL panel ,sound more like my vintage Apogee an Magnepan ,an even my old JBLs, it a richer fuller sound......well to me.

I have a like new pr of Martin Logan CLS panels that I have been running with a pair of Acoustat MK121 stock interfaces...the blue in front on them, is a nigh an day difference...
Know one I have found like the sound better with the blue in back on the CLSs

Andys dissection makes me feel that my choice is base only on the sound of my setup,an what I like....
No Damage can be done by doing the Switch...
All just one Acoustat owners findings....
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Old 21st April 2017, 11:18 PM   #1745
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Servo amp question here. One of my "new" servo amps has started to develop distortion on the letter "S" sound of female vocals and other such transients. Also, the speakers are completely out of phase now. This just happened over the past week. Is this characteristic of a bad tube? These amps have been nothing but one problem after another. I need some Analogue Associates servo amps.
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Old 22nd April 2017, 12:03 PM   #1746
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Quote:
Originally Posted by Jrimer View Post
Servo amp question here. One of my "new" servo amps has started to develop distortion on the letter "S" sound of female vocals and other such transients. Also, the speakers are completely out of phase now. This just happened over the past week. Is this characteristic of a bad tube? These amps have been nothing but one problem after another. I need some Analogue Associates servo amps.
I won't attempt to diagnose the malfunction in such a complex circuit. Could be a lot of things. Analogue Associates also does straight repairs in addition to several levels of modifications. Some of Mike's mods are aimed at increasing the reliability of the unit. I suggest you contact him as your most-trusted source for advice and repair. Owning servo amps comes with an almost-certain cost to keep them running, and I don't mean just new tubes.
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Old 22nd April 2017, 12:09 PM   #1747
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Quote:
Originally Posted by tyu View Post
I posted this question ....Because I know most, like over 98% of people never have seen were the blue wire goes on there Acoustat panels.....
For years have found the blue wire moved to the front, an white moved to the rear, on any ESL panel ,sound more like my vintage Apogee an Magnepan ,an even my old JBLs, it a richer fuller sound......well to me.

I have a like new pr of Martin Logan CLS panels that I have been running with a pair of Acoustat MK121 stock interfaces...the blue in front on them, is a nigh an day difference...
Know one I have found like the sound better with the blue in back on the CLSs

Andys dissection makes me feel that my choice is base only on the sound of my setup,an what I like....
No Damage can be done by doing the Switch...
All just one Acoustat owners findings....
So you're saying you like to listen to your speakers out-of-absolute phase. That's okay if it's what you prefer. But a much easier way to "try" this change is to reverse the input wires on each speaker, which does not require disassembly of the speaker and potential exposure to high voltages. It accomplishes exactly the same thing.
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Old 22nd April 2017, 01:07 PM   #1748
tyu is offline tyu  United States
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Thanks for your info..Andy
On paper all these question you , have been glad too help us all understand, has always seamed right..all here are luck to have some like you....this has been said more than once...an I for one am glad to say ..an I have never meant any disrespect ...

Yes its Right...but to my ears it dose not sound the same..as changing the panels wires....
Go fig...
I do think the Brain-Ear-Room-Audio Equipment, is a tough thing get right for anyone..an it could be said I spend to much of my time doing Audio related things..an I get...there must be rules...at lest to start with...
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Old 22nd April 2017, 11:16 PM   #1749
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Glad to hear that help is still available for Acoustat from Acoustat Answer man. I have an old Spectra 11 that I bought new in 1989 or 1990. That was my first electrostat. It still works but I have not powered it up in 3 years, ever since I got a used ML monolith III (at a good price) to replace the Acoustat. Anyway, I usually listen to minimonitors or 3 inch full range speakers in my bedroom.

I have never tried to retension the mylar film or tweeked it. I once called the helpline because the sound seemed unbalanced and Acoustat sent me a pair of interfaces, which seemed to have resolved the issue. The Acoustat panels are supposedly indestructible.
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Old 29th April 2017, 08:41 PM   #1750
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Quote:
Originally Posted by tyu View Post
Thanks for your info..Andy
On paper all these question you , have been glad too help us all understand, has always seamed right..all here are luck to have some like you....this has been said more than once...an I for one am glad to say ..an I have never meant any disrespect ...

Yes its Right...but to my ears it dose not sound the same..as changing the panels wires....
Go fig...
I do think the Brain-Ear-Room-Audio Equipment, is a tough thing get right for anyone..an it could be said I spend to much of my time doing Audio related things..an I get...there must be rules...at lest to start with...
The rules always come back to haunt you
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