Air Motion Transformers (Heil's) and New Diaphragms - Page 2 - diyAudio
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Old 12th February 2003, 04:24 AM   #11
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I had a buddy who worked there in the late 70's. He is actually the one who suggested I get the studio monitors that they had after he put a couple of the small Heil's into his AMC Pacer. Sounded great, I was hooked. Bought the Heil's and have considered my midrange and high-end covered ever since, though I have gone through many versions of woofers trying to find a match...

Have crossed mine over at a variety of freq's, and the Dynaudio/Heil combo sounds best letting the Dynaudio's do the work up to 2300 or so (it should, the Dynaudio's were hella expensive).

///kinda suprised anyone remembers Audio Mart from back in the day...
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Old 15th February 2003, 12:02 AM   #12
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maybe yor buddy did the demo for me
did you see the rtr 25"woofers at mcgee
seemes like they were 225 each,1986
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Old 16th February 2003, 10:46 AM   #13
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RTR woofers? 1986 I was in Boise, ID. In the 70's the only decent woofers McGee had were Eminence, and they left a bit to be desired.

My buddy was Steve Galpin(sp?) Used to play in a local band, and I ran their sound. He was drummer, about 5'10'' or so, a bodybuilder, and a cool guy. Always wondered what happened to him...
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Old 21st April 2003, 04:55 PM   #14
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Originally posted by AMT-freak
AMT-Freak - enjoys his Heil's down to 800 Hz in a two-way setup
What kind of XO are you usig? I'm looking for a (temporary i hope) passive design somewhere between 800-1.2k.

community sites,, ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 7th March 2004, 11:43 PM   #15
OliverD is offline OliverD  Germany
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I was browsing the forum for some information on magnet material in my AMTs just to discover someone asked me a question about my speakers!

Hope you don't mind me taking about a year to reply:

It's an active 24db Linkwitz-Riley XO since the woofers I'm using are great until about 800 Hz but have a large peak soon after 1 kHz, so... Also helps to reduce the load on the AMTs. Finding a low frequency counterpart for these tweeters is a tough job and I've seen many bad sounding speakers (including the original ESS). Having tried many expensive drivers I think you should definitely go two-way and let the AMTs play as low as possible.

Now for something completely different:

Does anybody happen to know what magnets they used in the old AMT-1 (the big ones)? I can only measure dimensions, but what about the material?
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Old 10th December 2004, 04:07 PM   #16
RAWDON is offline RAWDON  New Zealand
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Default heil diaphrams

i want to obtain a set of replacement diaphrams for my 1980 vintage ESS AMT MONITORS...WHERE IS THE BEST PLACE TO OBTAIN THEM..have just had the bass units and PASSIVE radiators overhauled..after 25 years of use...
please help someone..

Steve Rawdon
New Zealand
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Old 14th December 2004, 07:21 AM   #17
Raoul is offline Raoul  United States
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Not sure if this is the BEST place to purchase them, but it is A place...

Hope the link works. If not, search ebay for "heil diaphragm". By the way, I have never used them and do not have any information on the differences between the various incarnations of the heil diaphragms. It is a source, though...
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Old 27th December 2004, 03:22 AM   #18
RAWDON is offline RAWDON  New Zealand
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Default new heil diapragms

i have just obtained a replacement set of d/phragms from the west coast of the states and they sound just like the originals in my 1980 AMT'S from ESS..I obtained them as spares to my original that still work fine..(all are teflon/mylar units..I cant tell any difference in sound quality..

Steve in nz
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Old 1st January 2005, 10:43 AM   #19
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Good to know Steve...thanks!!
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Old 13th January 2005, 12:14 AM   #20
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I replaced the old soft diaphagms with the 'new and improved' mylar disasters - the new diaphragms sound terrible in comparison. They have a yellow tint to them and are not soft but hard and brittle - just like they sound.
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