dbx 131s - Single-Channel 31-Band Graphic Equalizer with Switchable 6 or 12 dB Boost/Cut Ranges and XLR/TRS Inputs/Outputs in White Finish

The dbx 131s Single-Channel 31-Band Graphic Equalizer is a premier choice for professionals seeking top-tier sound quality and reliability. Renowned for its exceptional performance and simplicity, the 131s continues the dbx legacy of producing industry-standard EQs for touring, studio work, and various audio installations. This model is designed to meet the rigorous demands of sound reinforcement environments while providing intuitive and straightforward controls.

The 131s features a single 31-band, 1/3-octave equalizer with Constant Q frequency bands, ensuring precise and effective frequency adjustments. Its ±12 dB input gain range allows for substantial control over the audio signal, while the switchable boost/cut ranges of ±6 dB or ±12 dB offer flexibility for fine-tuning or more pronounced adjustments. The unit includes 20mm nonconductive sliders for smooth operation and durability, and a front panel bypass switch for easy comparison between processed and unprocessed signals.

Designed for both studio and live sound applications, the 131s excels with an extended frequency response from <10Hz to >50kHz, and a dynamic range of over 108 dB. The graphic equalizer also features a 12 dB per octave low-cut filter at 50Hz, which effectively removes unwanted low-frequency noise while preserving the integrity of the desired audio signal. This filter is ideal for reducing rumble and improving overall clarity.

The dbx 131s is equipped with 4-segment LED ladders on the front panel to monitor output levels, providing clear visual feedback on signal strength. Connectivity options include XLR and 1/4-inch TRS inputs and outputs, allowing for flexible integration into various audio systems. Both input and output connections are electronically balanced/unbalanced and RF filtered, ensuring minimal interference and noise in the audio signal path.

Constructed in a sleek white finish, the 131s is housed in a rugged 1U steel chassis, designed to withstand the demands of professional use. It operates on a versatile power supply that supports voltages ranging from 100 to 240VAC at 50/60Hz, consuming just 15 watts of power. The unit is equipped with an IEC mains connection for easy and reliable power integration.

In terms of performance, the dbx 131s boasts a frequency response deviation of only ±0.5/-3 dB, providing accurate audio reproduction across a wide frequency range. The total harmonic distortion plus noise (THD+Noise) is less than 0.003%, ensuring pristine sound quality. Interchannel crosstalk is minimized to less than -90 dB from 20Hz to 20kHz, further enhancing audio clarity and separation.

Overall, the dbx 131s Single-Channel 31-Band Graphic Equalizer is a high-quality, reliable tool for audio professionals, offering exceptional performance and ease of use in a variety of sound reinforcement applications. Its blend of advanced features and rugged design makes it a valuable addition to any professional audio setup.

Features

• Single 31-band, 1/3-octave Constant Q frequency bands for precise equalization
• Switchable boost/cut ranges of ±6 dB or ±12 dB for flexible adjustments
• 12 dB per octave, 50Hz low-cut filter to eliminate low-frequency noise
• 20mm nonconductive sliders for durable and smooth control
• Front panel bypass switch for easy signal comparison
• 4-segment LED ladders for monitoring output levels
• XLR and 1/4-inch TRS inputs and outputs for versatile connectivity
• Electronically balanced/unbalanced inputs and outputs with RF filtering
• Frequency response from <10Hz to >50kHz, ±0.5/-3 dB
• Dynamic range of greater than 108 dB, typically >112 dB
• Signal-to-noise ratio of typically >95 dB
• Total harmonic distortion plus noise (THD+Noise) <0.003%
• Interchannel crosstalk < -90 dB from 20Hz to 20kHz
• Dimensions: 19 x 6 x 1.75 inches
• Weight: 4.8 lbs; Shipping weight: 6.2 lbs

Specifications

Inputs

• Connectors: 1/4-inch TRS, female XLR (pin 2 hot)
• Type: Electronically balanced/unbalanced, RF filtered
• Impedance: Balanced 40kΩ, unbalanced 20kΩ
• Max Input Level: >+21dBu balanced or unbalanced
• CMRR: >40dB, typically >55dB at 1kHz

Outputs

• Connectors: 1/4-inch TRS, male XLR (pin 2 hot)
• Type: Impedance-balanced/unbalanced, RF filtered
• Impedance: Balanced 100Ω, unbalanced 50Ω
• Max Output Level: >+21dBu balanced/unbalanced into 2kΩ or greater, >+18dBm balanced/unbalanced (into 600Ω)

System Performance

• Bandwidth: 20Hz to 20kHz, +0.5/-1dB
• Frequency Response: <10Hz to >50kHz, +0.5/-3dB
• Dynamic Range: Typically >112dB
• Signal-to-Noise: Typically >95dB
• THD+Noise: <0.003%
• Interchannel Crosstalk: <-90dB, 20Hz to 20kHz

Function Switches

• EQ Bypass: Bypasses the graphic equalizer section in the signal path
• Low Cut: Activates the 50Hz 12dB/octave high-pass filter
• Range: Selects either +/- 6dB or +/- 12dB slider boost/cut range

Power Supply

• Operating Voltage: 100-240VAC 50/60Hz
• Power Consumption: 15W
• Mains Connection: IEC receptacle

Physical

• Dimensions: 19 x 6 x 1.75 inches
• Weight: 4.8 lbs
• Shipping Weight: 6.2 lbs