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Old 1st August 2012, 09:06 AM   #11
tyu is online now tyu  United States
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Join Date: Jul 2009
8ea. Acoustat M4s..that 4, 9" an 4, 8" panels just sold on e-bay for $200.US...There out there.....Audiogon...But you can find some one that well pay you more...
But if you dont like the ones you have.... why would anyone wont more?....Hehe...right..I only buy the 9" No 8".... to me the 9" sound better...goodluck
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Old 1st August 2012, 02:39 PM   #12
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Quote:
Originally Posted by trevorpsy View Post
Recent problem I've had were rattling during heavy bass passages, which was cured by caulking the circumference of each panel
Do you mean placing a bead of caulk at the junction of the panels and the frame? Thanks!

I'm a fellow Long Beach Acoustat nut. At some point I'm planning on building replacement Acoustat panels; I'll let you know when I do. In the meantime, I do have some spare panels. Private message me if you're interested.
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Old 1st August 2012, 06:27 PM   #13
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Sounds like your problem was or still is lose diaphragms. you can re tension them with a hand held heat gun. this should be done every five to ten years. the diaphragms are made of Du Pont HS65 which is 65 gage heat shrink Mylar film. I would suggest you practice on some old panels so you don't melt your good ones. keep the gun at least 6 inches off the diaphragm and keep the gun moving all the time don't stop to concentrate on one spot. It is easy to spot loose diaphragms as you will see wrinkles in the corners of the panel. loose diaphragms will also collapse and stick to the stator much more easily than a well tensioned one will. I hope this helps. best regards Moray James.




Quote:
Originally Posted by trevorpsy View Post
Recent problem I've had were rattling during heavy bass passages, which was cured by caulking the circumference of each panel, and bass slap in a used replacement panel. (Sorry for the vague language. Rattling and slap are different and hard describe unless you've heard them already.)

I also was also having a problem with the unfinished wooden frame wicking up humidity and draining off the charge on the panels, resulting in a 10db or so loss of gain. (Humidity in Long Beach, CA often gets to 90+ percent overnight.) For a long time, I combated this problem by directing a space heater across the front my speakers. (I know, DUMB.) This melted on of my panels resulting in a failure.

The solution to the moisture problem was extremely simple (once I thought of it). I removed the bottom panels and directed the space heater at the bottom of the frame for several hours and then coated the bottom of the frame and two feet up the sides with clear lacquer. Problem solved!

My goal is to stock up on spare panels, because I know they're going to be unavailable someday soon.

Thanks once again for your thoughtful reply. It's appreciated.
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Old 1st August 2012, 07:01 PM   #14
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Quote:
Originally Posted by trevorpsy View Post
Recent problem I've had were rattling during heavy bass passages, which was cured by caulking the circumference of each panel, and bass slap in a used replacement panel. (Sorry for the vague language. Rattling and slap are different and hard describe unless you've heard them already.)

I also was also having a problem with the unfinished wooden frame wicking up humidity and draining off the charge on the panels, resulting in a 10db or so loss of gain. (Humidity in Long Beach, CA often gets to 90+ percent overnight.) For a long time, I combated this problem by directing a space heater across the front my speakers. (I know, DUMB.) This melted on of my panels resulting in a failure.

The solution to the moisture problem was extremely simple (once I thought of it). I removed the bottom panels and directed the space heater at the bottom of the frame for several hours and then coated the bottom of the frame and two feet up the sides with clear lacquer. Problem solved!

My goal is to stock up on spare panels, because I know they're going to be unavailable someday soon.

Thanks once again for your thoughtful reply. It's appreciated.
The problem of rattling panels, and/or 'bass slap' can often be remedied by gently and evenly re-shrinking the mylar diaphragm with a heat gun. The mylar can sometimes lose its tension. Although not a common problem, it does happen sometimes.

You may have effected the same result with your electric heater.

On the subject of the frame absorbing moisture to the extent that it bleeds off the bias, well, that's a new one to me. There really shouldn't be any contact between the high voltage parts of the panel and the wooden frame. You may have had leakage between the bias wire and the frame. Sheathing both the stator and bias wires in PVC tubing may remedy that. Later models of Acoustat did just that, although that was done more for arc-protection (read: fire protection) rather than bias bleed-off.
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Old 1st August 2012, 07:13 PM   #15
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Yes, Do Be Careful with that Heat gun !!!

Here is what happened when I wasn't pay attention and I looked away at something just for a moment. !!!

different ideas for ESL panels

jer
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Old 3rd August 2012, 12:13 AM   #16
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Join Date: Jul 2012
Location: Long Beach, CA
Smile Hi tyu

First of all, I want to thank all of you for your wonderful feedback.

To answer your question: I've replaced the panel I melted with a used panel that has bass slap. I've tried caulking the used panel with silicone, but this doesn't get at the problem. If I were content just to listen to Mozart string quartets, this wouldn't be a problem, but I like occasional heavy bass rock 'n roll as much as the next guy.

Also, knowing the way things seem to go around my house, it would be good to have a backup panel or two sitting in the wings.
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Old 3rd August 2012, 03:14 AM   #17
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Quote:
Originally Posted by trevorpsy View Post
First of all, I want to thank all of you for your wonderful feedback.

To answer your question: I've replaced the panel I melted with a used panel that has bass slap. I've tried caulking the used panel with silicone, but this doesn't get at the problem. If I were content just to listen to Mozart string quartets, this wouldn't be a problem, but I like occasional heavy bass rock 'n roll as much as the next guy.

Also, knowing the way things seem to go around my house, it would be good to have a backup panel or two sitting in the wings.
trevorpsy, I have spare panels & live in Long Beach. Since I am planning on building new panels, I can part with one. No charge. Private Message me if you want one.
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