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Old 18th August 2008, 07:40 AM   #1
Isight is offline Isight  Canada
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Default ESS AMT1s

Hi this is my first post hear and would like to ask a question. My mother has the ESS AMT 1B. The tweeters are now shot, I think it was her 8 ohm receiver. She has since bought new speakers and uses the woofers out of the 1Bs as subwoofers. So long story short I now have a pair of ESS AMT tweeters with shot diaphragms. I think they have 4 ohm diaphragms in them, I have head that there are 8 ohm diaphragms for these tweeters, is that true and if so where do I get them? I want to build some speakers with these tweeters once fixed, I have the crossover from them, so is there a woofer that will work with this crossover from the 1Bs? Oh ya, sort of off topic, what vintage receivers would you suggest to run these speakers?

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Old 18th August 2008, 11:51 AM   #2
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simplyspeakers has them: http://www.cart-secure.com/-strse-al...Categories.bok
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Old 18th August 2008, 02:41 PM   #3
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Hi Isight -
Congrats on scoring a pair of AMT1b's - a classic speaker! I use a pair of them with some Pioneer 10" units doing bass and midrange duties. http://www.partsexpress.com/pe/showd...number=290-088
You might want to try http://www.partsexpress.com/pe/showd...number=290-118 for a little better lower end.
Both of these LF/MF units are "low cost" speakers and won't break the bank and allow for a two way speaker which keeps things simple.
I run the Pioneer "full range" and use a 6.2 ufd cap in series with the AMT1 to pass HF http://www.partsexpress.com/pe/pshow...umber=027-236.
I trimmed back the AMT1 a bit with a 8 ohm resistor in series http://www.partsexpress.com/pe/showd...tnumber=004-8.

With regards to the amplifier - you don't need a vintage amp to run these speakers - just make sure that you are using an amplifier that won't be driven into clipping or produce high amounts of distortion when playing at high power levels. The diaphragm has a 3.7 ohm resistance - but when wired up with your crossover etc the impedance should be up near 8 ohms so no worries there. Your Mothers receiver most likely had little to do with the diaphragms getting smoked unless something shorted out or she was using a unit that didn't have enough clean watts to get the job done. The AMT1's do like clean power to play their best!

BTW - the crossovers ESS supplied don't cut it in today's world - and even if they were originally well designed (they weren't) - and used quality components (they didn't - at least not by modern standards) the caps and pot's are well beyond their life expectancy and should be reworked with fresh components. (Toss the potentiometer out of the circuit IMO - using pot's in a passive crossover just ain't right!)
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Old 19th August 2008, 12:06 AM   #4
Isight is offline Isight  Canada
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Thank you every on I will look in to that.
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