RDL 3 Band Equalizer with Knobs/Terminals

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Input: 100 kO 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 O) 10 Hz to 22 kHz (EQ set flat; ± 0.5 dB into 10 kO)
Noise: < -80 dB (below + 4 dBu)
Center Frequencies: Low Band: 80 Hz Mid Band: 1 kHz High Band: 30 kHz
Bandwidth: Low Band: 80 Hz Mid Band: 1 kHz High Band: 30 kHz
Ambient Operating Environment: 0° C to 55° C
Power Requirement: GROUND- REFERENCED. 24 Vdc @ 25 mA
Package Type: Cardboard Box
Package Dimensions: 4.375 x 7 x 2.25 in.
Shipping Weight: 0.8 lbs.
WEEE weight: 0.565 lbs.
Tariff code: 8518.40.2000

The RU-EQ3 features a balanced bridging input, which may be connected unbalanced if desired. The output driver is 150 O balanced, and is intended to drive unbalanced or balanced lines of 150 O 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.


  • 3-Band Audio Equalizer
  • Custom Tailored Audio Bandwidth
  • User-Accessible Adjustments
  • High-Density Rack-Mount Convenience
  • Low-Noise, Low-Distortion Equalizer

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