![]() ![]() Searching on the Parts Express web-site, I see that they carry a number of AMT tweeters ranging in price from about US$20 each to US$120 each. While ESS still makes speakers employing this technology (down to around 800 Hz), the patents have expired and many companies now build variations on this theme. Heil invented this concept in the early 1970’s and applied it a line of speakers built by the firm of ESS in South El Monte, California. When they do that at an audio rate, sound is produced. When the pleats are squeezed together, on one half of their cycle, they compress the air between each fold, displacing it and when the pleats expand again, on the other half of the cycle, they rarefy the air as it rushes in to refill the voids between each fold. The electromagnetic “motor” is arranged so that instead of moving a disc-shaped diaphragm in and out like a normal speaker driver, this one squeezes the pleats in a manner that is perpendicular (rather than parallel to) the desired air displacement. The diaphragm in the tweeter consists of a pleated Polyamide sheet arranged so that the pleated area is facing the listener. Of course, the same thing is occurring inside the bellows as well and that out-rush of air is what powers the instrument and vibrates the various reeds to play the notes. The compressing pleats push air out from between the pleats as that space is eliminated by the compression. ![]() ![]() If you place your hand close to the accordion’s bellows while someone is playing it, you will feel a rush of air as the accordion is squeezed together. When one pulls the bellows back apart, those spaces re-appear. In an accordion, when one squeezes the bellows together the space between the pleats goes away. The AMT differs from conventional tweeters in that instead of using a piston-like diaphragm the way most magnetic tweeters operate, this technology works similarly to the way an accordion functions. Best placement for martin logan motion fx driver#Instead, the Motion series is a cone-based speaker system that employs Oskar Heil’s “Air Motion Transformer” (AMT) technology for it’s high-frequency driver unit. The Motion series is a departure from MartinLogan’s traditional offerings in that this line of speakers does not utilize electrostatic drivers. Readers will remember that several months ago this reviewer wrote about the company’s bookshelf Motion™ 4i speakers. Hen mounted on a flat wall, the EM-FX2 protrudes only 6.8", making it the perfect surround channel speaker for large rooms, without adding unnecessary bulk or visual distraction.MartinLogan is an American speaker manufacturer (although its main factory is in Canada) long known for its hybrid electrostatic/cone loudspeakers. This substantial leap in size increases the bandwidth and efficiency of the high-performance tweeter for effortless center channel performance. MartinLogan's larger, low distortion Folded Motion XT tweeter boasts a radiating surface 40% larger than those found in the award-winning Motion® Series products. Available in a black satin finish, the EM-FX2 is designed to corner mount, wall mount or angle-wall mount for versatile surround sound placement in any room. A single 6.5-inch doped fiber-cone woofer provides powerful low-frequency extension. The EM-FX2 features dual Folded Motion XT tweeters in a wide-dispersion array ideally suited for surround channel applications. ![]() Martin Logan ElectroMotion FX2 Surround Speakerĭual Folded Motion XT tweeters in a wide- dispersion array ideally suited for surround channel applications. ![]()
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