The dbx 231s delivers exceptional sound and rugged reliability for professionals in touring, studio, and installed sound applications. As part of the revered dbx EQ lineage, the 231s combines precision 31-band 1/3-octave graphic equalization with straightforward controls, making it ideal for demanding sound reinforcement environments.

Designed for dual-channel operation, the dbx 231s offers ±12 dB input gain and switchable ±6 dB or ±12 dB boost/cut ranges, providing precise tonal control over your system. The 20mm nonconductive sliders and intuitive user interface make quick adjustments easy, while XLR and TRS inputs and outputs ensure seamless integration into professional audio setups.

With an extended 10Hz to 50kHz frequency response and a dynamic range exceeding 108 dB, the 231s guarantees clean, transparent audio. A front panel bypass switch and output level metering further enhance its versatility, whether on tour, in a studio, or in a permanent installation.

DBX 231s Features

  • Dual 31-band, 1/3-octave Constant Q frequency bands

  • Switchable boost/cut ranges of ±6 or ±12 dB

  • ±12 dB input gain range

  • Front panel bypass switch

  • 4-segment LED ladders for monitoring output levels

  • XLR and TRS inputs and outputs

  • Frequency response: <10Hz to >50kHz

  • Dynamic range: >108 dB

  • Rugged construction for touring and installation reliability

DBX 231s Specification 

Input Connectors 1/4" TRS, female XLR (pin 2 hot)
Input Type Electronically balanced/unbalanced, RF filtered
Input Impedance Balanced 40k ohm, unbalanced 20k ohm
Max Input >+21dBu balanced or unbalanced
CMRR >40dB, typically >55dB at 1kHz
Output Connectors 1/4" TRS, male XLR (pin 2 hot)
Output Type Impedance-balanced/unbalanced, RF filtered
Output Impedance Balanced 100 ohm, unbalanced 50 ohm
Max Output >+21dBu balanced/unbalanced into 2k ohm or greater; >+18dBm balanced/unbalanced (into 600 ohm)
Bandwidth 20Hz to 20kHz, +0.5/-1dB
Frequency Response <10Hz to >50kHz, +0.5/-3dB
Dynamic Range Typically >112dB
Signal to Noise Ratio Typically >95dB
THD+Noise <0.003%
Interchannel Crosstalk <-90dB, 20Hz to 20kHz
Bypass Switch Bypasses the graphic equalizer section in the signal path
Low cut Switch Activates the 50Hz 12dB/octave high-pass filter
Range Switch Selects either +/- 6dB or +/-12dB slider boost/cut range
Operating Voltage 100-240VAC 50/60Hz
Power Consumption 15W
Power Connector IEC receptacle
Unit Weight 6.2 lbs.(2.81 kg)
Shipping Weight 7.9 lbs.(3.58kg)
Dimensions 3.5" (8.9cm) H x 6"(15.24cm) D x 19" (48.26cm) W
List price: $406.25
Price: $325.00
SKU: DBX231SV
Catalog: 
Processors & DSP
Brand: 
DBX
Dimensions: 22 in × 12 in × 5 in
Weight: 10 lb