On the left is one of the two speaker cabinets I built. There is a fifteen inch ruler in front of the tweeter for scale. On the right is a page from the Jensen Loudpeaker Technical Manual 1060, Copyright ©1956. It is a folded woofer speaker design with dimensions of fifty-four inches tall, thirty inches wide, and twenty-four inches deep. Their only flaw is the fact that the pair weighs in at four hundred pounds. That is because two and a half full sheets of 3/4" pressboard, ten feet of 1x4's, and eight feet of 2x4's were used for each cabinet. However, the sound is just as solid as the cabinets themselves. Each is a three way cabinet with the following components: 15" Klipsh-type paper woofer with an Alnico magnet, a 120oz ceramic magnet aluminum diaphragm midrange horn, and a 90oz ceramic magnet bullet tweeter. I have tested these with rudimentary function generator software, and the frequency range is at least 40-18,000Hz. The signal drops in decibels significantly at 40Hz, but the speakers still output a solid signal down to about 28Hz. At the higher frequency, I can't tell the limit of the frequency range because the signal cuts out entirely at 18,000Hz, probably because of the software. The speakers have a power rating of 125 watts. While the power output may not seem like much compared to many of today's hi-fi or car enthusiast speakers, these cabinets and the components that came with the kit in the late 1950s were designed to reach 30Hz and little attenuation with just 16 watts back then. More importantly, the quality of the sound remains true.

Copyright ©2005-2010, Tom Brown
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