The Reg Williamson 9-Octave Graphic Equalizer is a 9-band (or “9 octave”) graphic equalizer designed by Reg Williamson, a British engineer very active in the 1970s and 1980s, particularly in publications such as Wireless World and Practical Electronics. He was known for his high-fidelity audio designs and precision analog circuitry.
📘 General Context
The equalizer was originally published as a DIY project in a contemporary technical magazine, likely Wireless World or Electronics Today International (ETI), around the mid- to late 1970s. Williamson proposed an all-analog design, with active filters centered on octave-spaced frequencies, intended to adjust the tonal balance of home or studio hi-fi systems.
• It was simple to build, with readily available components.
• It had good linear response and low noise, especially compared to inexpensive commercial equalizers of the time.
• It served both home hi-fi and studio monitoring or small PA systems.
