A high power RF amplifier utilizes dynamic biasing for transistors in an output stage of the amplifier. In addition, the \u2018open back\u2019 banjo sound quality is improved by allowing more sound to escape from the back and sides of the banjo. The adaptation includes a first and second operand register, each storing respectively a first and second set of 2’s complement binary data, an arithmetic logic unit, and a destination register. When the article is being used, the devices are out of the way resulting in minimal conflict with the use and activity around the sink, thereby allowing maximum unimpeded use of the sink area.