In the late 1970's, when live sound was still a technology that was the domain of sound wizards, and the bands that rented sound systems were often unfamiliar with the necessary steps for protecting the equipment in their charge, I drew up this set of cartoons for the ultimate benefit of the rental equipment. As things tend to happen, this cartoon set found its way through the secret audio underground of suppliers and dealers. It found its way to Cetec Audio (then manufacturing Gauss Loudspeakers) who first requested the right to print it. This was a very popular handout at AES conventions and was seen in the market for several years. Several years later, Altec Lansing had received a photo-copy of a photo-copy of a photo-copy of the original hand sketches. Not knowing who the author was, they had it re-drawn by a staff artist and published it as a Tech-Note. The author-ship was identified for the second printing. The technology looks as dated as you'd expect from the twenty plus years that has passed since it was drawn, but for the appreciation of the old timers in the pro-sound biz, it is available again (a digital re-release, now that's a 90's kind of thing) on the web. All twenty of the original images and descriptions are available here, just by clicking on the images below.