dbx 231SV Dual Channel 31-Band Graphic Equalizer

When professionals need a reliable graphic EQ, they turn to dbx. With a proven track record spanning more than four decades, dbx equalizers are trusted industry standards for touring, studio, and installed sound applications. The dbx 231S Graphic Equalizer is designed to meet the demands of professional sound reinforcement while maintaining simple, intuitive operation.

dbx 231S Dual 31-Band Graphic Equalizer Features

• Dual-channel 31-band, 1/3-octave Constant Q graphic equalizer
• Switchable boost/cut ranges of ±6 dB or ±12 dB
• Front-panel EQ bypass switch
• ±12 dB input gain control
• 4-segment LED output level meters
• XLR and 1/4″ TRS inputs and outputs
• Frequency response from <10Hz to >50kHz
• Dynamic range greater than 108 dB

The dbx 231S features two channels of precise 31-band, 1/3-octave equalization, ±12 dB input gain, switchable ±6 dB or ±12 dB boost/cut ranges, and smooth 20mm non-conductive sliders. Its intuitive user interface and accurate output level metering make it easy to dial in the perfect sound.

With an extended frequency response from 10Hz to 50kHz, a dynamic range up to 112 dB, premium internal components, and rugged construction, the dbx 231S delivers exceptional audio performance and long-term reliability. It is equally at home in studios, on tour, or in installed sound systems, continuing the legacy of dbx signal processors trusted by audio professionals worldwide.

DBX 231S Dual 31-Band Graphic Equalizer Specifications

Input

• Connectors: 1/4″ TRS, female XLR (pin 2 hot)
• Type: Electronically balanced/unbalanced, RF filtered
• Impedance: 40kΩ balanced, 20kΩ unbalanced
• Maximum Input Level: >+21 dBu balanced or unbalanced
• CMRR: >40 dB, typically >55 dB at 1 kHz

Output

• Connectors: 1/4″ TRS, male XLR (pin 2 hot)
• Type: Impedance-balanced/unbalanced, RF filtered
• Impedance: 100Ω balanced, 50Ω unbalanced

System Performance

• Bandwidth: 20Hz to 20kHz, +0.5 / -1 dB
• Frequency Response: <10Hz to >50kHz, +0.5 / -3 dB
• Dynamic Range: Typically >112 dB
• Signal-to-Noise Ratio: Typically >95 dB
• Total Harmonic Distortion + Noise: <0.003%
• Interchannel Crosstalk: <-90 dB, 20Hz to 20kHz

Function Switches

• EQ Bypass: Removes the graphic equalizer from the signal path
• Low Cut: Activates a 50Hz, 12 dB/octave high-pass filter
• Range: Selects ±6 dB or ±12 dB slider boost/cut range

Power Supply

• Operating Voltage: 100–240 VAC, 50/60 Hz
• Power Consumption: 15 W
• Mains Connection: IEC receptacle

Physical

• Weight: 6.2 lbs (2.81 kg)
• Dimensions (H x D x W): 3.5 x 6 x 19 inches (8.9 x 15.24 x 48.26 cm)