Thursday, May 11, 2023

Air Motion Transformer (AMT) Headphones

I love headphones. I love technology. So it stands to reason I like headphone technology. In fact I've written about it here on a couple occasions. So when a "new" innovation in the field springs up, I tend to take notice. It was just such an innovation that motivated me to peck out those original writings some thirteen years ago.

Back then I was quite bullish on the concept of planar magnetic technology. Here was something that promised to deliver much of the speed and resolution of electrostatic drivers, but with the ability to be plugged into any conventional headphone amp. And they were being made by a couple guys futzing around in a garage, producing headphones that rivaled the best multi-million dollar technology from the market's biggest players. It was almost like getting to witness Jobs and Wozniak stamping the first fruit logo on a home computer. And yeah, to me and many others, the writing was on the wall.

I'm less bullish on AMT technology, though. AMT, or Air Motion Transformer transducers, are closer in DNA to planars than dynamics or anything else. Essentially it's like an accordion. You have a folded diaphragm that squeezes and expands to move air. OK it's not really an accordion — an accordion is basically a bellows that squeezes air through reeds. AMT produces sounds through the folds themselves via extremely fast movement. One manufacturer reckons four times faster movement than planars or dynamics. (We'll get to them in a bit.) And like those technologies, you can plug it into an ordinary headphone amp.

Sounds promising so far, right?