dbx 231s Graphic EQ

The dbx 231s is a dual-channel 31-band graphic equalizer built into a compact 2-space rack chassis. Its 20mm nonconductive sliders offer precise tactile control, and the front panel bypass lets you engage or disengage EQ processing instantly without patching. This is a workhorse EQ for live sound, studio mastering, and fixed installations where serious tone-shaping meets reliability.

Audio Performance

Each channel delivers 1/3-octave equalization across a 10Hz to 50kHz frequency response, giving you surgical control over the entire audible spectrum and beyond. The 112 dB dynamic range ensures minimal noise floor, while switchable ±6 dB or ±12 dB boost/cut range adapts to both subtle corrections and aggressive tone shaping. A 12dB per octave, 3dB down at 50Hz low-cut filter removes rumble and sub-bass contamination when needed.

Design & Connectivity

Balanced XLR and TRS inputs and outputs on both channels integrate seamlessly into professional audio chains with minimal impedance interaction. The ±12 dB input gain and output level metering provide headroom management and visual feedback, while the dual-space rack mount chassis and 6.2 lb weight make installation straightforward in any standard 19-inch rack.

Key Features

• Dual 31-band 1/3-octave equalization channels
• 10Hz to 50kHz frequency response
• 112 dB dynamic range
• Switchable ±6 dB or ±12 dB boost/cut range
• ±12 dB input gain control
• 12dB per octave, 3dB down at 50Hz low-cut filter
• 20mm nonconductive fader sliders
• Balanced XLR and TRS inputs and outputs
• Front panel bypass control
• Output level metering
• Dual space, 19-inch rack mount chassis
• Weight: 6.2 lbs

The 231s combines straightforward dual-channel EQ with the precision and durability expected from dbx's pro audio lineup, making it an essential tool for venues, studios, and permanent installations demanding transparent, artifact-free equalization.