ESS Heil: The factory tour

Jeff Poth writes  .....

My most loyal readers will know that I have a place in my heart and my living room for the Heil Air Motion Transformer, specifically the big dog AMT1. This is a special type of transducer, similar in some respects to a planar speaker (Magnepan, others) but with a twist- or a fold. Instead of moving in and out, they compress or expand folds. This allows dramatically more surface area to apply pressure to a given amount of air and thus provides significantly more output than a conventional speaker with a given amount of diaphragm motion. In other words, the folding and compression scheme gives you a driver that can act much bigger than it is.

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