Air Motion Transformers (Heil's) and New Diaphragms - Page 3 - diyAudio
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Old 13th January 2005, 06:56 AM   #21
RAWDON is offline RAWDON  New Zealand
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Default yellow diaphragms

mine are the same as the originals...black and white..no yellow tinge..I tried them out..they sound just like the originals which are still in use...tks for the post..cheers steve
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Old 13th January 2005, 09:37 AM   #22
pooge is offline pooge  United States
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who did you buy them from?
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Old 18th January 2005, 07:01 PM   #23
RAWDON is offline RAWDON  New Zealand
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how do you mean they sound terrible...does the material feel soft compared to you old diaphragms or sound soft ..can you please give me more details and which model speaker are you using..the yellow colour should make no difference..

Steve
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Old 18th January 2005, 07:01 PM   #24
RAWDON is offline RAWDON  New Zealand
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hi pooge..I bought them from Orange County Spekaers
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Old 31st January 2005, 03:47 PM   #25
Urloony is offline Urloony  United States
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I'm glad I found this thread. Please forgive my newbieness, but I had just a couple questions.

I have a pair of heil tweeters, but unfortunately only have one of the original woofers. The cabinets seem to have been custom made as they are unfinished and transmission line construction. The volume of the box is about 1.2 cubic feet.

I was hoping you guys might have some ideas about what drivers to use in the box as replacements for the originals as well as crossover recomendation. I'm now using a radio shack special crossed at 2K.

The tweeters do not have a tone control. Is there a way to build one? Or is it not necessary. They do sound a little bright.

My last question is whether the impedance of most ESS Heil systems was 4 or 8 ohms or did they produce both?

any opinions appreciated
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Old 22nd June 2005, 06:37 AM   #26
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Default Old and New Big Heil Diaphrams

I have a number of Big Heils, as they are called by ESS, old and new. My spectrum analyser indicates:

The old diaphrams (silver looking) made on soft poly have a frequency response of 500 to 18K +- 1 db. The new diaphrams (yellowish looking) and made of a stiff material (kapton?) have a frequency resopne of 800 to 9k +- 3db.

I think they must have converted around 1999.

Big difference!

You can make great new diaphrams yourself. see Speaker Builder 2/1977
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Old 26th June 2005, 08:23 PM   #27
cdfr is offline cdfr  United States
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About the diaphragm Great Heil replacements. I suggest that you get it from ESS itself: http://www.essspeakers.com/
The guys are nice and the service and price are fine. I have mad quite a few purchase from them.

I have a 1973 AMT1b and a 1994 AMT1E Monitor. I must say that for me the Kapton diaphragm (yellow) sound fine. The original one its true were physically softer but sound wise I cannot say that there's been a degradation.
This latest model was tested by the guys at "Prestige Haute Fidelite" and they were as impressed as they were back when the Gret Heil came out.

Any one tried to make a Heil speaker using JBL bass drivers, may be even K2 drivers (2x 12 or 1x 15 inch)?

CD
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Old 26th June 2005, 09:06 PM   #28
cdfr is offline cdfr  United States
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Just to illustrate here is the graphs from Prestige Haute Fidelite
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File Type: jpg heil2_s2.jpg (84.6 KB, 1590 views)
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Old 26th June 2005, 09:09 PM   #29
cdfr is offline cdfr  United States
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Now a picture of the famous diaphragms
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Old 26th June 2005, 09:11 PM   #30
cdfr is offline cdfr  United States
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and a picture of my AMT1E Monitors with 2 Heils
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File Type: jpg heil_mon.jpg (63.4 KB, 1582 views)
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