Posted by yellowdog on Friday, December 8, 2017
Recently I Invented a Sound Surface Wave Powered “Banjo Bass & Enhancer Amp” (Pat. Pend.) Which Works Beautifully With Our “Banjo Tone Amp”. It Amplifies Bass Notes And Enhances the Sound Quality and Sustain of All Notes. It Works By itself But Performance With The Tone Amp is Noticeably Superior to Performance of Either Amplifier Used By Itself.
This very simple and inexpensive device ($14 plus $1 postage) attaches to the inside bottom of the banjo's wood rim with two Velcro dot pairs and a 1-1/4 inch strip of clear acrylic tape that brings sound surface waves from near the bottom of the wood rim at a 45-degree angle. The device itself is a low frequency amplifier with a high frequency amplifier attached to its top surface so that their audible sound outputs mix less than an inch below the head of the banjo. It is believed that this close proximity to the banjo head essentially makes the head a functioning part of the amplifying system and is the primary reason for the incredible volume and sustain delivered by the device. The high frequency amplifier amplifies the harmonics of the low frequency notes making them rich and beautiful, and aided by the banjo head, probably does the same for higher frequency notes. Four sound surface wave amplifying steel staples are used to amplify and control the flow of sound surface waves through the device. A "Theory and Instructions" document of 2 pages can be downloaded free from www.GeigerAcousticDevices.com and provides more detailed information including photos and a side view drawing.
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