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-   -   impedance of ESS Heil AMT tweeter? (http://www.diyaudio.com/forums/planars-exotics/121290-impedance-ess-heil-amt-tweeter.html)

dnewlin 13th April 2008 08:25 PM

impedance of ESS Heil AMT tweeter?
 
I just bought tweeters that were salvaged from ESS PS-920 Brilliance tower speakers. I need to build high-pass filters for them. Does anyone know their impedance, or whether all ESS tweeters have the same impedance?

Thanks,

david

planet10 13th April 2008 09:05 PM

Impedance & FR of the dipole heil... don't know if this is the one you have.

http://www.diyaudio.com/forums/showt...174#post749174

dave

BHTX 14th April 2008 07:38 AM

I'd sure like to have a few of these. :(

..Had some ideas for a big OB setup with them for a long time now. :cool:

People seem to be going nuts over these things.. kinda difficult to get ahold of a pair without getting caught up in an auction and paying too much. I wish ESS was still around..

ingvar ahlberg 14th April 2008 05:21 PM

2 Attachment(s)
I use a pair of Heil AMTīs have had them since late seventies i think, first model, some claim that the original diaphragm is better than new ones, i donīt know newer had to replace them. They are , i think, among the best hf units obtainable if bipolar work in your room. There has arrived, just a coupple of months ago, a new alternative, only front radiating thou, possible to modify for bipolar use with care. Iīve used theese since november, switching back and fort between Heillī, woodhorn with different drivers and the TPL150 and have become partial to the latter.
It also has the advantage of higher sensitivity and can be x/0īd lower than the Heill.

andresnovak 5th October 2008 02:21 PM

They are 6 ohms entirely perfectly resistive flat up to 23kHz with a small resonance @ 500hZ. At least monopolar. Idon't know about Big Bipolar from AMT's but principle is the same (bigger whitout dumping the back side)
It is better don't use it below 1kHz

andresnovak 5th October 2008 06:42 PM

BTW: They should be HiPass CrossOvered at 18dB/octave.

Bye:smash:


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