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Old 22nd August 2013, 08:06 PM   #2
tinitus is offline tinitus  Europe
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neat, and ok prices
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Old 22nd August 2013, 09:16 PM   #3
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Look like they were made in the same factory as the Airborne AMT's
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Old 22nd August 2013, 11:28 PM   #4
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Can the AMTPRO-4 really able to cross at 800hz like the ad says?

If I bought a pair does anyone want to do testing on them?
I'd love to see the results.
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Old 22nd August 2013, 11:35 PM   #5
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Not with an Fs of 900
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Old 25th August 2013, 01:57 PM   #6
puppet is offline puppet  United States
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I think the amt3-4 looks pretty good, XO around 3khz.
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Old 26th August 2013, 08:30 AM   #7
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Pulled apart my rt4001's a week ago, looking to see what would be required to make them Dipole. OK simple enough to do, but noticed that they use an adhesive to mount the ribbon at the top and bottom. This looks identical externally to the AMT2-4, slightly different specs. Most certainly is a limitation and raises Fs. This is a shame as the even larger ones would work well a bit lower.

Can think of several better ways to support without causing undue harm to the sound and lowering the low end resonance. Will add that with AMT's this is not nearly as bad as with other ribbon, dome and cone tweeters. Cross mine @2.2k LR4. Best would be about an octave higher. CSD's are fast!!!

Here's a closeup of the adhesive...
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File Type: jpg RT4001_ribbon_closeup_small.jpg (696.0 KB, 765 views)
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Old 26th August 2013, 09:16 AM   #8
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Do need to add one comment. Quality Control is a bit lacking. One star off as John Krutke would say.

The ribbon shown is the one with issues. Impedance is off, >10% higher eg 3.2Ω vs 3.71Ω. Sounds good, have more testing todo. Have heard similar reports elsewhere about this issue.
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Old 29th August 2013, 05:04 PM   #9
CSS/XBL is offline CSS/XBL  Canada
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Hi,

The whole ATM/Heil world has suddenly expanded. I'm aware of at least 3 smaller Chinese manufacturers as well as Aurum Cantus, Mundorf, Adam, Eton, B & C, Mark and Daniel and, of course ESS (there are probably more). A larger OEM can demand a certain level of quality and consistency but for many you get what you get.

Bob
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Old 29th August 2013, 05:15 PM   #10
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Quote:
Originally Posted by Greebster View Post
Do need to add one comment. Quality Control is a bit lacking. One star off as John Krutke would say.

The ribbon shown is the one with issues. Impedance is off, >10% higher eg 3.2Ω vs 3.71Ω. Sounds good, have more testing todo. Have heard similar reports elsewhere about this issue.
Most possibly caused by a short between two or more folds, but when playing the movement of the diaphragm may cause it to "un-short" intermittent or it can be your ohm meter that puts out a DC voltage so the diaphragm move and creates the short. Try to measure with the opposite polarity - then the diaphragm folds will move the opposite way....
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