About theYamaha Q2031B 2 System 31 BAND Dual-Channel Graphic Equalizer Effector Rackmount
The Yamaha Q2031B is a professional dual-channel graphic equalizer that has established itself as a classic and reliable tool for system tuning and tonal shaping in a wide range of audio applications. Housed in a standard 2U rack-mount chassis, this unit provides two independent 31-band EQ sections, each precisely aligned to the ISO standard 1/3-octave center frequencies spanning from 20Hz to 20kHz. This granular control allows sound engineers to make detailed corrective adjustments to PA system response, room acoustics, or individual channel strips with high precision, helping to eliminate feedback, compensate for resonances, and achieve a balanced, transparent sound.Each channel features high-quality, center-detented slide potentiometers for intuitive visual and tactile adjustment, with a wide gain range of +/-12dB per band. The Q2031B is designed for signal integrity, utilizing low-noise circuitry to ensure that equalization is applied without adding coloration or artifacts to the audio path. Its straightforward layout includes individual in/out bypass switches for each channel, allowing engineers to quickly A/B compare the processed and unprocessed signal—an essential feature for verifying the effectiveness of adjustments during live sound reinforcement or installation calibration.Renowned for its robust construction and musical sound, this equalizer serves as a fundamental piece of signal processing gear in live sound racks, broadcast facilities, recording studios, and permanent installations. While digital processors have since expanded functionality, the Yamaha Q2031B remains valued for its immediate, hands-on control, reliability, and sonic transparency. It embodies a no-frills, focused approach to equalization, providing engineers with a trusted and effective tool for achieving system clarity and tonal accuracy.
Key Features
- Professional dual 31-band graphic equalizer for sound tuning
- Provides precise control over audio frequency response
- Rackmount design for convenient integration in live or studio setups
- Low-noise circuitry ensures clean, high-quality sound processing
- Ideal for sound reinforcement, recording, and broadcasting environments
Yamaha Q2031B 2 System 31 BAND Dual-Channel Graphic Equalizer Effector Rackmount Specs
Product Identification BrandYamaha ModelQ2031B Product TypeDual-Channel 31-Band Graphic Equalizer Form FactorRackmount Equalizer Performance Channels2 Independent Bands per Channel31 Frequency Range20 Hz to 20 kHz Center FrequenciesISO Standard 1/3 Octave Gain Range per Band+/- 12 dB Controls & Switching Channel Controls31 Vertical Slide Faders per channel Function SwitchesLevel (Input Attenuation), Range (+/-6 dB / +/-12 dB) BypassIndividual Channel IN/OUT Bypass Switch Input & Output Input ConnectorsXLR and 1/4″ TRS (Combo) Output ConnectorsXLR and 1/4″ TRS (Combo) ImpedanceInput: 20 k-ohms, Output: 600 ohms General Specifications Signal-to-Noise Ratio> 96 dB (IHF-A) Total Harmonic Distortion<0.1 % Rack Units2U Power Requirements100V, 120V, 220-240V AC (selectable)
Key Features
- Professional dual 31-band graphic equalizer for sound tuning
- Provides precise control over audio frequency response
- Rackmount design for convenient integration in live or studio setups
- Low-noise circuitry ensures clean, high-quality sound processing
- Ideal for sound reinforcement, recording, and broadcasting environments
