dbx 231s Graphic EQs
Description
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 reinforcement, monitor mixing, and fixed installations where serious tone-shaping meets road-tested 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 live sound crews, monitor engineers, and permanent installations demanding transparent, artifact-free equalization you can count on night after night.
More Information
| Condition | New |
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At a Glance
The dbx 231s is a dual-channel 31-band graphic equalizer housed in a compact 2-space rack unit, designed for live sound, studio work, and fixed installations where surgical tone control meets rock-solid reliability. Its 20mm nonconductive sliders and front-panel bypass give you instant, tactile control over the entire frequency spectrum—perfect for shaping monitors, main PA, or individual channels on a gig or in the studio. With a 112 dB dynamic range, switchable ±6 dB or ±12 dB boost/cut, and a low-cut filter to kill rumble, it delivers transparent, artifact-free correction that sits invisibly in any pro audio chain.
Who This Is For
Great for
- ✓ Live Performance
- ✓ Studio Sessions
- ✓ Fixed installations
- ✓ Venue sound systems
Not the best pick for
- – Practice
- – Home Recording on a budget
Skill level: Intermediate · Advanced · Professional
Frequently Asked Questions
What does dual-channel 31-band mean, and how precise can I get with EQ?
The dbx 231s provides two independent channels, each with 31 faders tuned to 1/3-octave intervals across the entire audible spectrum (10Hz to 50kHz). That granularity lets you target and adjust specific problem frequencies or resonances with surgical accuracy, rather than broad strokes.
Can I use this for both live sound and studio work?
Yes. The 231s is built for live performance, studio sessions, fixed installations, and mastering work. Its low noise floor (112 dB dynamic range), transparent sound, and versatile connectivity make it equally at home in a live PA rack or patched into a mixing console in the studio.
What's the difference between the ±6 dB and ±12 dB boost/cut range, and when would I use each?
The switchable range lets you choose between ±6 dB for subtle, transparent corrections and ±12 dB for more aggressive tone-shaping. Use ±6 dB for mastering and precision mixing; switch to ±12 dB for heavier feedback control or creative sound design in live or studio contexts.
Does it work with XLR and TRS, or just one?
The dbx 231s has balanced XLR and TRS inputs and outputs on both channels, so you can patch it into nearly any professional audio setup without adapters or impedance issues.
Will this fit in a standard equipment rack?
Yes. The 231s is a dual-space (2U) 19-inch rack mount chassis weighing 6.2 lbs, designed to slide into any standard pro audio rack alongside your other gear.