DBX 231s Dual-Channel 31-Band Graphic Equalizer (Each)
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dbx 231s Dual-Channel 31-Band Graphic Equalizer Delivering Precise 1/3-Octave Frequency Control, Low-Noise dbx Circuitry, and Balanced XLR and TRS I/O for Live Sound, Studio, and Installed Audio Applications
The dbx 231s is a professional dual-channel 31-band graphic equalizer providing 1/3-octave frequency control across the full audible spectrum on two independent channels simultaneously. Built around dbx’s trusted low-noise circuitry with ±12dB of cut and boost on each of the 31 ISO-standard centre frequencies, balanced XLR and TRS I/O, a built-in subsonic filter, and output limiting via Type III noise reduction, the 231s is a reliable, accurate, and versatile EQ solution for live PA system tuning, studio monitor correction, feedback control, and installed audio system optimisation. Its compact 1U rack-mount form factor and comprehensive feature set make it equally at home in a touring rack, fixed installation, or studio outboard chain.
Key Features
- Dual-Channel 31-Band 1/3-Octave EQ — Two independent channels of 31-band graphic EQ covering the full audible spectrum at ISO-standard 1/3-octave centre frequencies for precise, surgical frequency correction
- ±12dB Cut/Boost per Band — Each of the 31 bands provides up to 12dB of cut or boost for flexible tonal shaping without overdriving adjacent frequency bands
- Balanced XLR & TRS I/O — Fully balanced XLR and TRS inputs and outputs on both channels for professional, noise-free connectivity in any system
- Built-In Subsonic Filter — Removes sub-audible low-frequency content to protect speaker drivers and maximise usable amplifier headroom
- Type III Noise Reduction — dbx Type III noise reduction on outputs for clean, low-noise signal transmission even at high gain settings
- Output Clip Limiting — Built-in output limiting prevents clipping and protects downstream amplifiers and speakers from signal overload
- Compact 1U Rack-Mount — Standard 1U rack-mount chassis for integration into any PA, studio, or installed AV system rack
Specifications
| Specification | Details |
|---|---|
| Channels | 2 (dual, independent) |
| Bands per Channel | 31 (1/3-octave, ISO standard centre frequencies) |
| Frequency Range | 20Hz – 20kHz |
| Cut/Boost Range | ±12dB per band |
| Inputs | 2 × XLR (balanced) + 2 × TRS (balanced) |
| Outputs | 2 × XLR (balanced) + 2 × TRS (balanced) |
| Subsonic Filter | Yes |
| Noise Reduction | dbx Type III |
| Output Limiting | Yes |
| Frequency Response | 20Hz – 20kHz (±1dB, all sliders at 0) |
| Dynamic Range | >100dB (A-weighted) |
| THD+N | <0.02% (1kHz, +4dBu) |
| Rack Size | 1U rack-mountable |
| Dimensions (H × W × D) | 44 × 482 × 165mm |
| Weight | Approx. 2.0kg |
| Finish | Black |
What's in the Box
- 1 × dbx 231s Dual-Channel 31-Band Graphic Equalizer
- IEC power cable
- User manual
Ideal for live PA system tuning, studio monitor correction, feedback suppression, and fixed installation audio optimisation. Available at Harmony AV — Authorized dbx Dealer in India.
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