DBX 231/231SUB 2 Series Graphic Equalizer

The dbx 231/231SUB 2 Series Graphic Equalizer is a high-quality audio processing tool designed for both live and studio environments. Known for its precision and reliability, this equalizer offers enhanced audio control through its dual-channel, 31-band graphic EQ. Here’s a detailed description:

Key Features:

1. Dual-Channel, 31-Band EQ:
   • Each channel features 31 bands with 1/3 octave spacing, allowing for fine-tuned control over a wide range of frequencies.
   • The bands are centered at ISO standard frequencies.
2. High-Quality Filters:
   • Incorporates constant Q filters with a 3% center frequency accuracy, ensuring precise and stable performance across all bands.
3. Robust Connectivity:
   • Balanced XLR and TRS inputs and outputs provide flexible connectivity options.
   • Offers the ability to integrate seamlessly with other professional audio equipment.
4. Enhanced Audio Performance:
   • Provides an impressive dynamic range of greater than 108 dB.
   • Equipped with low-noise circuitry to maintain audio clarity and reduce unwanted noise.
5. Adjustable Range and Control:
   • Offers selectable ±6 dB or ±12 dB boost/cut range for more detailed control over the audio signal.
   • Includes an LED ladder for precise level indication, aiding in accurate adjustments.
6. Additional Features:
   • Low-cut filter (switchable) at 40 Hz or 50 Hz to remove rumble and low-frequency noise.
   • Power-off hardwire bypass with 2-second power-up delay to prevent pops and surges.
7. Build and Design:
   • Housed in a rugged, all-steel chassis designed to withstand the rigors of both touring and studio environments.
   • Intuitive interface with smooth faders and clearly marked controls for ease of use.

Applications:

• Live Sound: Ideal for tuning PA systems, controlling feedback, and enhancing overall sound quality in various venues.
• Studio Recording: Provides precise frequency control for mixing and mastering, helping to shape the sonic character of recordings.
• Broadcasting: Ensures clear and balanced audio for radio and TV broadcasts.

Specifications:

• Frequency Response: 10 Hz to 50 kHz, ±0.5 dB
• Signal-to-Noise Ratio: >108 dB
• THD + Noise: <0.003% at +4 dBu, 1 kHz
• Input Impedance: 40 kΩ (balanced), 20 kΩ (unbalanced)
• Output Impedance: 100 Ω (balanced), 50 Ω (unbalanced)
• Maximum Input Level: +21 dBu (balanced/unbalanced)
• Maximum Output Level: +21 dBu (balanced/unbalanced)

The dbx 231/231SUB 2 Series Graphic Equalizer is a versatile and powerful tool for audio professionals seeking precise control over their sound. Its combination of advanced features, robust build, and high-quality components make it an essential addition to any audio setup.

The DBX 231 (also sometimes referred to as the DBX 231s or 231SUB), part of the DBX 2 Series graphic equalizer family, is a discontinued but well-regarded audio processor designed to enhance the sonic quality of your sound system. While it’s no longer in production, understanding its features and functionalities can be valuable if you’re considering buying a used unit or encountering one in a professional audio setup.

This preview will delve into the key characteristics of the DBX 231, unpacking its specifications, functionalities, applications, and user considerations.

• Dual 31-Band, 1/3-Octave Constant Q Equalization: The heart of the DBX 231 lies in its dual graphic equalizers, each offering 31 sliders that correspond to specific frequency bands. These bands are spaced one-third of an octave apart, providing detailed control over a wide range of the audio spectrum. The constant Q design ensures consistent bandwidth for each slider, regardless of boost or cut applied, leading to more predictable and accurate equalization.
• Switchable Boost/Cut Range (±6dB or ±12dB): The DBX 231 offers two switchable boost/cut ranges for each band. The ±6dB range provides subtle adjustments for fine-tuning, while the ±12dB range allows for more dramatic shaping of the sound. This flexibility caters to various applications, from addressing minor room resonances to creating distinct sonic profiles.
• XLR and TRS Inputs and Outputs: The DBX 231 boasts professional-grade connectivity with both XLR and TRS connectors for balanced and unbalanced signals on both input and output stages. This ensures compatibility with various audio equipment in both live sound and studio environments.
• Comprehensive Metering: The unit features informative LED level meters to monitor output levels and gain reduction. This visual feedback helps users make informed adjustments while preventing signal clipping and maintaining optimal audio quality.

• Bypass Switch: A handy bypass switch allows for quick A/B comparisons between the equalized and unprocessed signal. This is crucial for evaluating the impact of your EQ adjustments and ensuring they enhance rather than degrade the sound.
• ±12dB Input Gain Range: The DBX 231 provides a ±12dB input gain range, enabling users to match the incoming signal level for optimal processing. This is particularly beneficial when working with sources of varying output strengths.
• Durable Construction: The DBX 231 is built with high-quality components housed in a rugged metal chassis. This ensures longevity and reliable performance in demanding professional settings.

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Applications:

• Live Sound: The DBX 231 is a versatile tool for live sound applications. It can be used to:
  • Correct for room acoustics by attenuating problematic resonances or boosting under-represented frequencies.
  • Tailor the sound to specific venues, adjusting for stage reflections or audience seating positions.
  • Shape the tonal balance of individual instruments or entire mixes.
• Studio Recording: In recording applications, the DBX 231 can be used for:
  • Mitigating unwanted room coloration in microphone recordings.
  • Sculpting the tonal characteristics of instruments or vocals during tracking.
  • Making corrective EQ adjustments during mixing to achieve a desired sonic signature.

• Broadcast and Sound Design: The DBX 231 finds applications in broadcast and sound design for:
  • Voice processing, enhancing clarity and presence for vocals or narration.
  • Adjusting the tonal balance of pre-recorded audio elements to ensure sonic cohesion within a production.
  • Creating specific sonic effects by boosting or attenuating targeted frequencies.