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Old 26th November 2012, 01:31 PM   #51
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That's pretty high humidity - it will tend to increase the potential for small discharges...

The heatgun may have merely reduced the humidity at the cells on a temporary basis, or it may have "fixed" the problem. Imo.

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Old 26th November 2012, 07:48 PM   #52
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Good to hear, audioboat. When I had the same issue, the heat gun solved it. It seems that when the membranes stretch over time, it becomes easier for the membranes to contact the stators, and re-tensioning fixes this.
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Old 26th November 2012, 09:37 PM   #53
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Dear Bear;

You are right again! The pops are coming back this morning. The heat gun did fix the issue temporary, but it is not a final fix. The humidity is high, but why the pops only happens to the top right and left panels on both speakers?
The other thing is that membranes are becoming stretched and easier to contact the stators when deep bass comes in.
I don't what is fix for this.
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Old 27th November 2012, 04:57 AM   #54
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Someone wrote this in another forum in regards to the Acoustat speakers.

"The HS65 does not develop enough tension in the plane of the diaphragm to stay perfectly stable and that is the reason there are felt pads on the back side of the panel they add some resistive air load to help keep the diaphragm stable under hard drive. "

I took the pads off to vacumm the panels. I now can not play the music loud anymore, otherwise the top 2 panels will have cracking sound.
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Old 27th November 2012, 10:47 AM   #55
tyu is offline tyu  United States
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Re-moveing of the pads is a Mod....
you can keep better top end an get the pad sourport... by just puting tape on the back of the panels....the felt pads eat to much top end for most...but most dont have 12 panels playing at once like you do....the tape is eze if you dont like you can just pull it off an put the pads back on....Some like duck tape... i like paper tape...
good luck

Last edited by tyu; 27th November 2012 at 10:49 AM.
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Old 27th November 2012, 01:37 PM   #56
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The problem with tape is that it causes reflections at frequencies where the distance between the diaphragm and the "tape" form 1/4 wavelength and other multiples. This causes aberrations in the frequency response. It happens that this is in the high frequencies.

The benefit of the felt is that it absorbs the HF and minimizes these resonant reflections while doing the job of adding load at LF...

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Old 27th November 2012, 04:29 PM   #57
tyu is offline tyu  United States
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The problem with tape is that it causes reflections at frequencies

I find a lot of problems with most ESL setup....just not the tape.

But thanks for all an any info on ESLs ...
If i had to live with the felt pads on... i would not be using the Acoustat panels for over 25-30 years.......if it sounds better.... that where i live...
My ear an eyes like a lot of things that are not quit right too others or on paper....
But if you dont go you dont know!...
.An puting the felt pads back on is a littel harder than a littel tape....
I only am saying what myself an others have found....By living with Acoustats....good luck

Last edited by tyu; 27th November 2012 at 04:34 PM.
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Old 28th November 2012, 04:00 AM   #58
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I can confirm the with the pads on, the speakers can be played back at high SPL level without issues. However, the HF may effected slightly.
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Old 28th November 2012, 09:27 AM   #59
tyu is offline tyu  United States
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Sounds about right....you got a lot going on with 12 panels...4 121 interfaces an the amps an room to to be in....
As for the pads... thay work great as some say if your runing the Acoustat Panels the way a lot of people think there only good for ...just as bass drivers ...from like 500hz down... Lot of people think Acoustas ...are too dark sounding...
I do run Magnepan 6' true ribbons with my Acoustats but i run the panels fulrang.... only crossover is a cap on the ribbons....good luck
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Old 28th November 2012, 11:19 AM   #60
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I also have one pair of Mag 1.7. I purchased from an Australian dealer about a year ago. Compare with the Acoustat, I prefer the Acoustat, not just the bass but middle range as well. Since I can not hear anything above 16KHz so it does not matter much if it rolled off around that freq.

I put the pads back on and they sound good to me. I may change the socks some stage.

I am going to order the parts so that I can mod the interface units.
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