DBX 131S
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Manufacturer Information
DBX
https://www.dbxpro.com
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The dbx Series 2: The "Pro" Spirit Made More Accessible
With the Series 2, dbx has a clear goal: to maintain the fundamentals that made its graphic equalizers renowned in live sound and control rooms, while offering simple handling and a format ready to integrate into any rack. This generation emphasizes an intuitive user interface, readable level control, and careful design to provide a real quality upgrade for those seeking an effective graphic equalizer without unnecessary complexity.
Who Is This 31-Band Graphic Equalizer For?
This model is designed for applications where one wants to quickly and cleanly correct a system response or overall tone: console output processing, optimization of a sound reinforcement system, stage monitor management, or corrective equalization in the studio (on a bus, a monitor, or a dedicated outboard). Thanks to its balanced inputs/outputs and 1U format, it naturally fits into a FOH rack, a rental fly-case, or a studio rack, offering immediate and reassuring operation for daily use.
Precise Control, Operational Security, and Signal Integrity
31 Bands at Constant Q: Correct Without Degrading
The 1/3 octave equalization allows fine targeting of resonances, potential feedback, and harsh frequency areas while preserving overall balance. The choice of a constant Q provides consistent correction across the entire fader range, convenient for fast and reproducible work, whether system tuning or monitor adjustment.
Two Correction Amplitudes and Bypass: From Diagnosis to Action
The switchable +/-6 dB or +/-12 dB range is a real advantage in use: in +/-6 dB mode, precision and subtlety are prioritized; in +/-12 dB mode, there is useful headroom for stronger corrections. The front panel bypass switch facilitates instant comparisons and secures operation in case of doubt by allowing immediate validation of the actual effect of the processing.
Low-End Management, Level Monitoring, and Robust Construction
The 50 Hz high-pass filter (12 dB/octave) helps clean up sub-bass and rumble, often responsible for pumping or a muffled sensation in the low end, especially in live conditions. The 4-segment LED output level indicator provides a quick reference to avoid overloads and maintain comfortable headroom. Finally, the use of 20 mm non-conductive faders and an integrated power supply with toroidal transformer aligns with a logic of reliability and stability, making this unit built to withstand rigging and long hours of service.
Technical specifications
| Category | equalizer |
| Number of channels | 1 |
| EQ | 31 channels |
| Frequency response | 10 Hz - 50 kHz |
| Rack unit | 1 |
| Number of bands | 1 x 31 bands 1/3 octave constant Q |
| Effective range | +/-6 dB and +/-12 dB (switchable) |
| High-pass filter | 12 dB/octave at 50 Hz |
| Bypass | front panel switch |
| Faders | 20 mm non-conductive |
| Indicator | 4-segment LED output level meter |
| Connections | balanced XLR and 6.35 mm jacks |
| Inputs | 1 balanced input on XLR and 6.35 mm Jack |
| Outputs | 1 balanced output on XLR and 6.35 mm Jack |
| Distortion + noise | > 95 dB |
| Signal-to-noise ratio | < 0.003% |
| Dynamic range | > 112 dB |
| Crosstalk | <-90 dB, 20 Hz to 20 kHz |
| Power supply | integrated with toroidal transformer |
| Size | 1U |
| Dimensions | 152.4 x 482.6 x 44 mm |
| Weight | 2.2 kg |
Questions frequently asked
Is the DBX 131S suitable for eliminating feedback on stage monitors?
Its 31 bands at one-third octave with constant Q allow targeting problematic frequencies. The correction range can be switched between ±6 dB for fine adjustments and ±12 dB for more pronounced interventions.
What connectors are available on this equalizer?
The input and output are offered in both XLR and balanced 6.35 mm jack connectors. This connectivity allows integration on a console output or within a rack processing chain.
Is the low-cut filter on the 131S adjustable?
The low-cut filter is fixed at 50 Hz with a slope of 12 dB per octave.
How much rack space does it occupy?
This model occupies 1U and measures 482.6 x 44 x 152.4 mm. Its weight is 2.2 kg. The power supply is built-in and uses a toroidal transformer.
How to control the output level and compare the equalization?
A 4-segment LED meter displays the output level. The front-panel bypass switch enables immediate comparison between the processed and unprocessed signals.
