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Multi-Way Conventional loudspeakers with crossovers

To Heil AMT or not to Heil at 0, that is the question?
To Heil AMT or not to Heil at 0, that is the question?
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Old 27th December 2018, 03:29 AM   #1
dtaylo3 is offline dtaylo3  United States
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Default To Heil AMT or not to Heil at $140, that is the question?

What do folks think about the new Heil AMTs? Looks like the manufacturer is selling them for $140 on its website!

Maybe the end of the line -- or just a big-*** sale.

For $140 it seems hard to beat, or am I just overly-optimistic?
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Old 27th December 2018, 04:18 AM   #2
fishball79 is offline fishball79  Singapore
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You think too much. Just buy a pair and plan the next speaker build with them.
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Old 27th December 2018, 04:27 AM   #3
ScottG is offline ScottG  United States
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HEIL AIR-MOTION TRANSFORMER (AMT)

-a good driver for dsp (to improve linearity).

The original "I" (..though note that production quality isn't terribly consistent):
Attached Images
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File Type: gif Klirrfaktor-1.1kHz.gif (84.9 KB, 654 views)
File Type: gif Wasserfallspectrum.gif (88.2 KB, 650 views)
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Old 27th December 2018, 04:50 AM   #4
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by dtaylo3 View Post
What do folks think about the new Heil AMTs? Looks like the manufacturer is selling them for $140 on its website!

Maybe the end of the line -- or just a big-*** sale.

For $140 it seems hard to beat, or am I just overly-optimistic?
The AMT patent expired a few years back. So there's a bunch of vendors selling AMTs. I'm guessing ESS Labs is just trying to stay competitive.
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Old 27th December 2018, 05:13 AM   #5
dtaylo3 is offline dtaylo3  United States
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Yup, overthinking. Also down 65K in market in two months. Ouch. Have some beautiful SB Acoustics 5-inch ceramics itching to find a mate. Maybe a 14 liter box, or TL with the Heil on top. Hmmmmm.
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Old 27th December 2018, 04:08 PM   #6
Cask05 is offline Cask05  United States
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Some plots using a Klipsch Cornwall bass bin and ESS AMT-1 performance after about a week of AMT-1 use (taken from here), and a notional first order network for passive crossover crossing at 800 Hz:

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Chris
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Old 27th December 2018, 08:05 PM   #7
ICG is offline ICG  Germany
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Originally Posted by Cask05 View Post
Some plots using a Klipsch Cornwall bass bin and ESS AMT-1 performance after about a week of AMT-1 use (taken from here), and a notional first order network for passive crossover crossing at 800 Hz:

[..some pretty diagrams..]
While your measurement plots look incredibly awesome, they aren't of any significance; you've not disclosed on how these measurements were taken (measurement mic, enviroment, distance, spl, gate, room etc) nor is that crossover actually usable, no wonder there's a 800Hz resonance in the graph. No information on angled measurementsor the room energy balance. Once you'd want to get significant dynamics (let's say 105dB/1m), a merely 6dB slope and a that low crossover frequency will result in a HUGE distortion peak and several significant decay ridges.

An extremely low crossover frequency AND a extremely slow slope at the same time result in horrible sound once any dynamics are arising.

Or in other words: Your measurements don't say anything. Repeat with feasable scaling, crossover, different spl levels and at least some measurement informations and it might say something at last.
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Old 27th December 2018, 10:40 PM   #8
Cask05 is offline Cask05  United States
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While your measurement plots look incredibly awesome, they aren't of any significance...Once you'd want to get significant dynamics (let's say 105dB/1m), a merely 6dB slope and a that low crossover frequency will result in a HUGE distortion peak and several significant decay ridges...An extremely low crossover frequency AND a extremely slow slope at the same time result in horrible sound once any dynamics are arising.

Or in other words: Your measurements don't say anything. Repeat with feasable scaling, crossover, different spl levels and at least some measurement informations and it might say something at last.
You talk as if you wanted more information, but curiously, you ask in such a way that appears pretentious--and frankly--offensive. Why is that? Have I inadvertently insulted in some way?

Others here can certainly ask specific questions if they want. Or they can simply go to the thread already linked above from where the combined figures originally were posted...and read. I'll be happy to answer any further questions--but if they are phrased as questions--not insults.

[My apologies to the OP for this distraction.] I kept the information posted to a minimum--plots only--to give some feel to others on how the AMT-1's acoustic and electrical measurements might work out for them. No one asked for this information, but I provided it for passing interest only.

It is this kind of behavior, i.e., of the type quoted just above by "ICG", that most leaves me wondering why anyone would try to post in this forum.

Chris

Last edited by Cask05; 27th December 2018 at 10:45 PM.
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Old 27th December 2018, 11:57 PM   #9
chrisb is offline chrisb
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dtaylo3, that certainly represents a pretty steep discount over their normal prices - hopefully not a portent. As Patrick noted, with all the competition in this class of driver, maybe ESS was stuck with an abundance of stale inventory that the bean counters/ bankers advised to write down?
I’ve used original production AMT1s on a couple of projects, and they are still among my favorite tweeters, but I’d certainly need ICG’s cautions.
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Old 28th December 2018, 01:16 AM   #10
kec is offline kec  United States
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Originally Posted by dtaylo3 View Post
What do folks think about the new Heil AMTs? Looks like the manufacturer is selling them for $140 on its website!

Maybe the end of the line -- or just a big-*** sale.

For $140 it seems hard to beat, or am I just overly-optimistic?
Thanks for this thread dtaylo3. I've been wanting a pair for a long time but never pulled the plug. Today I did. $140 is a great price and free shipping to boot.
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