DOD R-830 (c. 1981–1985)
The DOD R-830 is a solid-state dual 15-band graphic equalizer from DOD Electronics Corp., built to mount in a standard 19-inch rack. A short product write-up in Mix (Dec 1982, p.21) gives the essentials: 15 bands per channel on standard ⅔-octave centers, with ±12 dB of boost or cut on each band. That is nearly the whole dry spec sheet. The rest of what's known comes from one serious bench review and a few DOD ads.
The real substance is in Modern Recording (Jan 1981, p.66-67). Lab testing found the -1 dB response points below 20 Hz and beyond 20 kHz, with the spacing between adjacent bands very nearly uniform across the audio range. The reviewer liked the separate input level control on each channel and considered that kind of trim essential on a unit like this. He judged the R-830 very attractively priced, and said it would have been worth the money even as a simpler ten-band design. His only real complaint was that the sliders do not produce linear increments of boost or cut, though he felt a little practice would sort that out.
Beyond that, the record is thin. The R-830 appears in DOD's own advertising through 1985, but no original manual, service literature, or dependable production figures seem to have survived. It was an affordable, no-frills pro-audio equalizer from DOD's early-'80s lineup, and it was well regarded where it was actually measured.
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