ESS Heil AMT filters?

[Digger]

Hello dears i bought recently ESS Heil AMT and connect them directly to my av receiver, i know that classic dynamic twitters need filtes as not to burn them. So the question is... ESS Heil AMT with pleated Mylar diaphragm need filters? or it will be work fine as it. or it need filters necessary to correct frequency.

 

[SSS]

Would recommend a high-pass filter in order to avoid the power of bass frequencies which is stronger than the mid-highs. Reason is not to overload the membrane. Also it is possible that the bass will excite the membrane so much that there may also be distortion of the mid-high frequencies. But I am not sure since I sold my AMT from the 1970ies long time ago because of not really good sound.

 

[Chris A]

So the question is... ESS Heil AMT with pleated Mylar diaphragm need filters? or it will be work fine as it. or it need filters necessary to correct frequency.

Well, you can use a first-order crossover set with 15" woofers:

Heil Air motion transformer for Cornwalls

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The best solution I've found can be seen here (double stack AMT-1 on top of Belle Klipsch bass bins, crossed using DSP):

Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

That's what I currently use on my surrounds--double stacked AMT-1s (with each top AMT-1 leaning back about 15 degrees via neoprene wedge) and using a miniDSP 2x4 HD to cross and correct the amplitude response.

The leaning back of the top AMT-1 in each two-high stack mitigates the very narrow vertical polars that you get with ribbon drivers. YMMV.

Chris

 

[daniboun]

Hello dears i bought recently ESS Heil AMT and connect them directly to my av receiver, i know that classic dynamic twitters need filtes as not to burn them. So the question is... ESS Heil AMT with pleated Mylar diaphragm need filters? or it will be work fine as it. or it need filters necessary to correct frequency.

View attachment 507397

Hi,
I created a DIY project based on these tweeters, which, by the way, are really great.
I can direct you to a company that has developed a dedicated "made in France" filter for these ESS Heil AMT. It has a very practical gain compensation system.

"ESSentielle" DIY Floor Speakers with ESS Heil AMT3, based on MHP project.

Hi amigos, Let me introduce my new DIY floor speakers (2.5 way) based on the "ESSentielle ADS" diagram of "la maison du haut parleur" (MHP) The cabinetmaking is made of French Ash wood with a vertical grain. (25mm) These speakers are based on the famous ESS Heil AMT 3 Tweeter (latest...

www.audiosciencereview.com

 

[voodooless]

Never ever, ever, hook this thing directly to an amp, especially not a AVR that runs full power. You will very quickly destroy the driver with low frequency contents!

At least add a cap to remove most of the low frequency contents.

@Digger, why did you hook it up to the AVR anyway?

 

[Chris A]

Never ever, ever, hook this thing directly to an amp, especially not a AVR that runs full power. You will very quickly destroy the driver with low frequency contents!

Unless you've actually tried this, I think your response here borders on hyperbole.

The AMT-1 is actually very robust. If the diaphragm is in good condition (i.e., not produced in the time frame ~November 2019 to ~May 2020--when there were many conductor voice coil failures due to ramped-up production in S. California at ESS), it will withstand up to 40 w/channel input, even if subjected to full-range signals.

It just won't sound very good if subjected to program material below 500-710 Hz at higher power/SPL.

Chris

 

[voodooless]

Unless you've actually tried this, I think your response here borders on hyperbole.

No, I have not. I would not.

The AMT-1 is actually very robust. If the diaphragm is in good condition (i.e., not produced in the time frame ~November 2019 to ~May 2020--when there were many conductor voice coil failures due to ramped-up production in S. California at ESS), it will withstand up to 40 w/channel input, even if subjected to full-range signals.

The spec says 40 W from 800 Hz. They didn’t spec that for nothing. Even if it is true, and they can take a bit of a beating, you should still not do it, pretending it’s going to be fine is just reckless.

 

[Chris A]

To the OP: keep it under 105 dB at the listening position and I think you'll be fine.

It just will sound a lot better if you do a proper job of blocking LF amplifier input and cross competently to a good bass bin--like I showed in the link below (that I missed posting the correct link above):

Heil Air motion transformer for Cornwalls

That's pretty simple and cost-effective.

Chris

 

[Digger]

Never ever, ever, hook this thing directly to an amp, especially not a AVR that runs full power. You will very quickly destroy the driver with low frequency contents!

At least add a cap to remove most of the low frequency contents.

@Digger, why did you hook it up to the AVR anyway?

I was confident in the quality of the speakers, as I have planar headphones that are very demanding in terms of sound amplification. I'm new to this hobby, how do I know if any damage was caused by my mistake? If it has occurred.... "in tech spec Maximum power: 160W I think it's a lot."

 

[voodooless]

I was confident in the quality of the speakers, as I have planar headphones that are very demanding in terms of sound amplification.

I still do not follow any of this... Planar headphones, speakers, AVRs, and now the AMT? How does all of this fit together?

I'm new to this hobby, how do I know if any damage was caused by my mistake? If it has occurred....

Probably, if it doesn't smell funny, the diaphragm does not look torn, and it sounds without audible distortion, it will be fine. If you really want to know, you'll have to do some measurements using a microphone.

"in tech spec Maximum power: 160W I think it's a lot."

Yes, but that is dynamic power, more akin to music. And this is only about the thermals. It does not cover the physical limitations of the diaphragm material in case of overexcursion. That is also why it is stated that this is valid from 800 Hz on, and the minimum specified crossover frequency is even higher at 1200Hz, 2nd order.