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Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm

Brand:| Model: AMTPRO-4
Overview
The Dayton Audio AMTPRO-4 Air Motion Transformer is designed for professional audio and demanding high-fidelity applications in which high SPL demands combine with the need for detailed reproduction and musical finesse.
Highlights
  • Folded Kapton ribbon diaphragm delivers clean, detailed, and highly dynamic output
  • Open back design permits dipole or chamber loading
  • Pro-level output and ruggedness for PA boxes, studio monitors, or high-efficiency home playback
Part # 
275-094
Weight: 2.65 lbs.  
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Product Details

Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm

Dayton Audio's AMTPRO-4 model features an extremely large AMT diaphragm with an open-back design and powerful neodymium magnetic assembly. This combination produces high output and low distortion over a broad frequency range, while handling large amounts of amplifier power.

Perfect for use in PA loudspeakers, large-format studio monitors, custom cinema speakers, or extreme performance hi-fi loudspeakers, the AMTPRO-4 can easily be chamber-loaded or open-baffle loaded as required by a particular dipole application. Thanks to its ability to be crossed over as low as 800 Hz, the AMTPRO-4 driver is a uniquely effective solution for midrange reproduction as well as treble, and can even be used as a wide-bandwidth “mid-tweeter” driver.

Dayton Audio AMT (Air Motion Transformer) tweeters borrow technology from the original Heil Air Motion Transformer to provide ultra-clean, detailed, and dynamic treble output. The pleated ribbon diaphragm of an AMT provides a large acoustic radiating area condensed into a compact chassis, for extremely high SPL output, wide bandwidth, and improved power handling.



Product Specifications
  • Tweeter TypeAir Motion Transformer (AMT)
  • Impedance4 ohms
  • Power Handling (RMS)50 Watts
  • Frequency Response800 to 18,000 Hz
  • Sensitivity94 dB 1W/1m
Thiele-Small Parameters
  • Resonant Frequency (Fs)800 Hz
  • DC Resistance (Re)4.17 ohms
  • Voice Coil Inductance (Le)0.10 mH
  • Total Q (Qts)4.95
Mounting Information
  • Overall Outside Diameter7.87" x 3.94"
  • Cutout Diameter2.83"
  • Depth1.42"
Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm
  • BrandDayton Audio
  • ModelAMTPRO-4
  • Part Number275-094
  • UPC848791000645
  • Product CategoryTweeters
  • Unit of MeasureEA
  • Product Rating
    (3 Reviews)
  • Weight2.65 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Reviews

Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm
Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm is rated 5.0 out of 5 by 3.
Rated 5 out of 5 by from At least as good as Heil.I originally built a system using an 8" Tang Band W8-1808 and ESS Heil Motion Transformer. After an unfortunate accident with one of the Heil's, (they break in half if you drop them) I installed a set of Lineaum tweeters. More recently I have installed a set of AMT Pro-4 motion transformers.Compared with the Heil, the AMT Pro-4 distortion measurements are at least comparable and in fact better than the Heil. While I wouldn't cross them that low, distortion remained low on the Pro-4 all the way down to 1 KHz where I started the measurement. The Heil distortion remained low only to about 1.2 Khz where it started ramping up. Both drivers are excellent but the Pro-4 definitely has a little advantage at the low end and thus can be crossed over slightly lower. Currently I have the Pro-4 crossed over at 1.5 KHz but 1.2 KHz should be no problem.In my current situation I don't have a means to measure the dispersion pattern of the Pro-4 but if it has a weakness relative to the Heil or the Lineaum, that's where it would likely be. It's not symmetrical like the other two drivers so I doubt it can produce a uniform dipole pattern as well.The height of the Pro-4 obviously causes it to have a narrow vertical dispersion, a bit more narrow than the Heil and a lot more than the Lineaum. This isn't necessarily a problem depending on the application. For a critical listening system you don't necessarily need a large coverage angle in the vertical axis. While not inexpensive, these are not so unreasonable as to make it impractical to build a floor to ceiling array with them which would of course eliminate any narrow vertical dispersion concerns.I haven't done a lot of listening test since pulling out the Lineaum's and installing the Pro-4 but based on what little I have done I believe they will easily match the Heil and they are probably a little better than the Lineaum. The Lineaum had to be crossed over at 2400 Hz and distortion in the Lineaum generally runs about 10 dB higher than the Pro-4. Both the Pro-4 and the Lineaum have very low distortion but the Pro-4 does have about a -10 dB advantage. Also there is almost 10 dB difference in sensitivity so the Lineaum needs more power.After one of the Heil's was broken I planned to order a replacement but about that time PE dropped the ESS line. Also, in the mean time the Lineaum's convinced me they would be an acceptable replacement. Now, after measuring the AMT Pro-4 and after the limited listening I've done so far, I definitely no longer have any interest in spending the money for the Heil. Other than the possibility of a more uniform dipole dispersion pattern it simply offers no advantage. It does have disadvantages however, it's extremely heavy and it's poorly constructed. Basically two pieces of angle iron with bar magnets stuck to them held together by thin plastic. I think you would have to work at it to break the Pro-4, it's very solidly built and while not really light, it's no where near as heavy as the Heil.For the moment the Pro-4's will remain on this system. I have more Lineaum's on the way from e-bay so I will be trying a double stack of Lineaum's. I will post the results of that on my web site.mk
Date published: 2015-01-26
Rated 5 out of 5 by from Dynamic and resolvingI'm using this with a Satori MW16P-4 6.5" woofer in a Parts Express TW-0.75MA cabinet, vented alignment. This is a bi-amp project using a MiniDSP 2x4 crossover. I am crossing over at 1500 Hz / 48 dB per octave. I found I could go down to 1200 Hz without trouble, but 1500 Hz seemed to work a little better. I made a rear chamber for the and filled it with layers of thick acoustic felt.Sound is VERY detailed and has a more 'dynamic' quality than ribbon drivers I've used. GREAT DRIVER!!!
Date published: 2015-01-05
Rated 5 out of 5 by from Exceptional AMT unit!! every bit as good as ESShaving I have owned ESS Heil AMT-1's in the past I thought I would try these for a Altec Lansing horn speaker system I am building for some efficient high end frequency range along with sonic clarity and WOW!! Awesome combo with a good set of horns!! Ill post pics and detail on the whole system when done... stay tuned...
Date published: 2014-03-24
  • 2015-07-28T07:06CST
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Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm

If I wired three of these in series to get a 12 ohm line array is there a stock xover that would work correctly....let me keep a lowish cover point like 800 hz or so?

Asked by: DBoy
We do not have any pre-built crossovers that will suffice for this application. In order to cross a 12 ohm load at 800 Hz, you will need a 9.1 uF cap and 4.5 mH coil.
Answered by: MattP
Date published: 2015-07-27

Are replacement diaphragms available for this model like they are for the ESS AMT? I am guessing from the design, that they are pretty much buttoned up in assembly and not replaceable but though I would ask.

Asked by: RayW
No, we do not have any replacement diaphragms at this time.
Answered by: MattW
Date published: 2015-04-01

Would the AMT be suitable with a 1khz crossover with a 12db slope?

Asked by: hemloc
The lowest cross over point I would recommend is 2Khz.
Answered by: MattW
Date published: 2015-04-08

Hi, I consider the large Dayton Pro AMT-4 tweeter. If I where to put this tweeter in a closed box, then how large a box should I aim for? (the Qt is very high). Thanks! Best regards Peter

Asked by: PeterDenmark
At these high frequencies, the box volume does not have a significant effect on the sound radiation from the front of the AMT, nor will it have an impact on the low frequency response. The main job of a rear chamber for a driver like this is absorption of the back wave. I would provide a distance from the radiating element to the cabinet wall of 1 inch all around, and 2 inches directly behind the AMT. If desired, you can either leave the rear felt in place or remove it and add stuffing to the chamber behind the AMT.
Answered by: DaytonAudio_Rory
Date published: 2014-12-31

Is there any off-axis FR data available for this driver?

Asked by: jt128
Unfortunately the only charts we have available are on the spec sheet for the driver. You may want to check out our Tech Talk forum for possible third party measurements both on and off axis.
Answered by: MattP
Date published: 2014-09-17

Recommended cross over frequency?

If using this tweeter in a two-way with two 10" Dayton PA225-8's, what do you recommend as the best cross-over frequency for max power handling and clarity for a studio monitor type speaker. Also, do you have one of these or can you recommend a design since you are now offering quite a few AMT tweeters which reach down to 700-800Hz?
Asked by: daveapex
Consider looking at the old ESS designs that used Air Motion Transformers. The full size AMTs first used a 1200Hz xover, then a later version used 1000Hz, and the AMT 1c used 800Hz. But they always used 3rd order (18dB) slopes!
Answered by: bluez
Date published: 2013-10-15
  • 2015-07-28T08:18CST
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