Purple Audio Odd 4 Band Inductor-Based EQ Module
A four-band inductor-based EQ. Designed to work in standard “500" racks. Designed by Ed Anderson for Purple Audio. A modern update of the classic “swinging inputs” console EQ, with four easy to use bands. Each band uses a high quality inductor and carefully selected caps to give two switchable frequencies. The bands are carefully shaped and spaced to be musical, even at full boost or cut. The highest band can be switched from bell to shelf, to boost frequencies extending well beyond 20kHz. The lowest band can also be switched from bell to shelf, reaching down into the subsonic range. There are illuminated pushbuttons for additional fixed low (red) and high (yellow) cut filters. A relay true bypass (green) allows for easy comparison with unprocessed source material. With the low and high cut switched out, and all four bands set to 0, the frequency response is +/- 0.25dB from 15Hz to 25kHz, and -3dB at 60kHz.
With specialized input and output transformers, the Odd has plenty of headroom, even at full boost. The entire circuit is discrete, with no electrolytic capacitors in the signal path, and no servo amps. With only two active stages, the current draw is low enough to work in any rack, and leave plenty of juice for other modules. The Odd uses one KDJ3 opamp and one KDJ4 opamp.
High frequency switchable from bell to shelf
High frequency 12kHz / 8kHz
High-mid frequency 4kHz / 1.8kHz
Low-mid frequency 650Hz / 300Hz
Low frequency 150Hz / 75Hz
Low frequency switchable from bell to shelf
Each band boost or cut by 12dB
Switchable High cut at 12kHz
Switchable Low cut 60Hz