Three Band Audio Equalizer with Knobs - Terminal Block The RU-EQ3 features a balanced bridging input, which may be connected unbalanced if desired. The output driver is 150 Ω balanced, and is intended to drive unbalanced or balanced lines of 150 Ω or higher impedance. Front-panel knobs provide active equalization, each controlling a separate audio band. These bands were carefully selected to yield a module that works effectively in a wide variety of systems. Each band's center frequency can be either boosted or attenuated by at least 12 dB. The Q of the low and high band equalizers was selected so that those controls can be functionally considered as a total bass band or treble band control. The RU-EQ3 adds a third control. This midrange control is optimized to voice band adjustment, with the overlap tailored to provide smooth operation for wideband music applications. The RU-EQ3's OVERLOAD indicator flashes if either the input or output stage clips. Features: 3-Band Audio Equalizer Custom Tailored Audio Bandwidth User-Accessible Adjustments High-Density Rack-Mount Convenience Low-Noise, Low-Distortion Equalizer Specifications: Input:100 kΩ balanced or unbalanced bridging; line-level THD+N:< 0.030%; 0.010% typ. (1 kHz, +4 dBu reference; flat response) CMRR:> 60 dB (100 Hz) Frequency Response:20 Hz to 22 kHz (EQ set flat; +/- 0.5 dB into 600 Ω) 10 Hz to 22 kHz (EQ set flat; +/- 0.5 dB into 10 kΩ) Noise:< -80 dB (below +4 dBu) Center Frequencies:Low Band: 80 Hz Mid Band: 1 kHz High Band: 30 kHz Bandwidth:Low Band: 20 Hz to 300 Hz Mid Band: 200 Hz to 7 kHz High Band: 3 kHz to 30 kHz Power Requirement:GROUND-REFERENCED, 24 Vdc @ 25 mA Ambient Operating Environment:0 C to 55 C
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