ESS AMT

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#61
Cask05 said:
The initial measurements of the AMT-1 that I bought in December 2018 look like the bottom solid trace in Rob's measurement. After a few days, it looks like the top trace.

The band around 5 kHz doesn't look like Rob's. I believe the amplitude response disturbance corresponds to the ribbon supports/magnet assembly reflecting energy and being summed with the main portion of the ribbon output.
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Circling back to the 5 kHz dip issue: There was a document going around on some other AMT threads a while back... I don't remember which ones, but I've re-posted the docs here. In essence, he is stating that the 5 kHz dip is caused by leakage around the lamination stack, and he provides a solution. Based on that, I've covered the leakage path indicated in the document very cheaply with black electrical tape, both front and back. I think it has made an audible improvement, but then again, maybe that's just expectation bias.

Unfortunately, I don't have a setup to measure this, but if one of you gentlemen with a decent measurement setup is willing to apply some tape and make a few measurements, maybe we could get some more insight.
 

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#64
I am tempted to try the AMTs, what is the vertical dispersion? Is it more or less constant up to around 10K? I am not convinced I need stacking (at least not, in my application, to extend the FR or to lower distortion at low frequencies).

I would like to try it with an 8" (B&C/PHL) or old 10" (JBL) mid on OB or similar (guessing with a XO around 1 kHz) and a sealed 12" woofer below (<150Hz)

What is the horizontal dispersion down to 2 kHz without horn/wings? I might try a short horn and try to approximate the horizontal dispersion of the mid.

In my case they would go in a small room (5m x 4m) and they would be placed in front of a large bookshelf. I also have and idea and try a 3d printed diffusor for the back of the AMT.
 
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