This is a reprint of an original Review from 1973.This review is audio history! The amazing Heil Air-Motion driven speaker from ESS! What a technical breakthrough! Collected today and very rare, here is the 1973 review done by Leonard Feldman. A piece of audio history! This review has a full test of the product, full specs, and commentary. I have many more ESS Ads and Reviews on my eCRATER Store. THANKS! -Each Page is 8.5" by 11"Please check out my new Vintage Audio Web Site, www.VintageAudioArchive.com-Shipping is $3 in the USA and $6 ANYWHERE else, I ship WORLDWIDE! Each additional item is only $1 more to ship!-As always, your satisfaction is GUARANTEED at Electronics Archives! If you are unhappy with any purchase, email and I will get you a resolution or a refund!-Email me with any questions, I put 10-20 new Ads and Brochures on my site EVERY DAY! THANK YOU!Powered by eCRATER . List your items fast and easy and manage your active items.