the Yamaha GQ1031 is a 31-band (20Hz to 20KHz) graphic equalizer that fits in a 1U rack. It can be used as a mono equalizer or as a single channel one when paired with another similar unit.
Two available - both for $150.00
Features
31 bands of equalization with 12dB of boost or cut on each band.
Input level control adjusts input sensitivity, permitting optimum level matching with a wide range of sources, or can be used to match the level of equalized sound with that of bypassed (unequalized) sound.
EQ switch in addition to main power switch determines whether equalizer circuity is on or bypassed; LED indicator lights when EQ circuitry is on.
LED peak indicator lights when output level reaches or exceeds 3dB below the 20dB clip level.
Input and output connections are via either standard 1/4" phone jacks or XLR balanced connectors.