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REQ231 Owner's Manual

Keith Harris
Updated

Dual 31 Band 1/3 Octave Graphic Equalizer w/ Sub Output

 

Important Safety Instructions

A standard electrical safety warning label enclosed in a rounded rectangular border: Left Icon: A black triangle containing a white lightning bolt symbol indicating high-voltage electrical hazard. Center Text Box: A central box with a black top banner reading "CAUTION" in white uppercase text. The white lower box reads "RISK OF ELECTRIC SHOCK. DO NOT OPEN" in black uppercase text. Right Icon: A black triangle containing a white exclamation point symbol indicating a general safety hazard alert.
  • To reduce risk of electric shock, never open the unit. There are no user serviceable parts, refer service to the Rockville service center.
  • Do not expose this unit to any kind of moisture.
  • Please ensure that the unit is situated in a properly ventilated area.
  • Make sure the unit is placed on a level and stable surface.

 

Functions

Front Panel:

A technical line drawing depicting the front faceplate of the Rockville REQ231 dual 31-band graphic equalizer with numbered callouts from 1 to 8:1: Rack Mount Ear: Mounting hole positioned on the far-left edge of the faceplate bracket.2: AUDIO IN/OUT Button: Push-button switch for bypassing or engaging the equalizer audio processing circuit.3: I/O METER IN/OUT Button & LED Level Display: Push-button toggle for the level meter alongside a horizontal LED level meter ranging from -18dB to CLIP.4: INPUT Gain Knob: Rotary gain control dial ranging from -12dB to +12dB.5: LOW CUT Knob: Rotary high-pass filter frequency control dial (10 Hz to 400 Hz).6: HIGH CUT Knob: Rotary low-pass filter frequency control dial (2.5 kHz to 30 kHz).7: RANGE Button: Push-button switch to select the equalizer slider boost/cut range ($\pm 6\text{ dB}$ or $\pm 12\text{ dB}$).8: 31-Band Equalizer Sliders: Dual identical channels (CHANNEL 1 on top, CHANNEL 2 on bottom), each containing 31 vertical frequency adjustment faders spanning 1/3-octave bands from 20 Hz to 20 kHz.
  1. Rack ears: allows for unit rack mount using four attaching screws and washers (not included).
  2. Audio In/Out switch: enables/disables the corresponding EQ section. Use the Audio In/Out switch to compare directs to processed signals. Use this to bypass your current EQ settings to hear your system with and without the EQ on.
  3. I/O Meter In/Out switch & LED Meter: use to toggle the LED meter to display input or output levels. When the switch is pressed in, meter will display output levels. The LED meter monitors the signal level to warn you of distortion.
  4. Input level control: adjusts the input level ±15dB.
  5. Low-Cut control: determines low end cut-off frequency (10Hz – 400Hz with a 18dB per octave roll-off). Setting this knob to 10Hz will act as a bypass for this control.
  6. High-Cut control: determines high end cut-off frequency (2.5kHz – 30kHz with a 18dB per octave roll-off). Setting this knob to 30kHz will act as a bypass for this control.
  7. Range switch: allows you to switch between maximum boost/cut in each frequency from ±12dB to ±6dB (switch pressed). 8. Equalization sliders: cut or boost corresponding frequencies by ±12dB or ±6dB.

 

Rear Panel:

A technical schematic line drawing showing the rear panel connection hub of the Rockville REQ231 graphic equalizer, with numbered callouts from 1 to 8: 1: Power Switch: Rocker-style power switch labeled "POWER" with ON (I) and OFF (O) indicators. 2: DC 12V / 1.5A Input: Circular power supply input jack located directly to the right of two safety caution labels. 3: X-OVER FREQ Control Knob: Rotary frequency adjustment dial for the subwoofer output, adjustable from 30 Hz to 200 Hz. 4: SUB OUT Port: 3-pin male XLR subwoofer output jack. 5: Balanced XLR Input Ports: 3-pin female XLR input connectors (shown for CHANNEL 2 and CHANNEL 1). 6: 1/4" TRS Input Jacks: 1/4-inch TRS balanced/unbalanced audio input jacks. 7: Balanced XLR Output Ports: 3-pin male XLR output connectors (shown for CHANNEL 2 and CHANNEL 1). 8: 1/4" TRS Output Jacks: 1/4-inch TRS audio output jacks.
  1. Power switch
  2. DC 12V/1.5A Power Input
  3. Crossover Frequency control: 30Hz – 200Hz
  4. XLR Subwoofer Output
  5. Balanced XLR Input
  6. Balanced 1/4˝ TRS Input
  7. Balanced XLR Output
  8. Balanced 1/4˝ TRS Input

 

Features/Specifications

  • Dual channel (31 bands per channel)
  • Variable stage low and high cut filters
  • 1/3 octave filter sets (ISO centers)
  • 20Hz to 20kHz effective equalization range
  • Constant Q filters
  • Selectable 6dB or 12dB cut or boost range
  • Output level LEDs (-10 to +17dB)
  • Bypass switch with status LED
  • Ground lift switch
  • Balanced XLR Input/Output
  • Subwoofer out
  • Channels: 2 (stereo) 
  • Connectors: XLR balanced inputs and outputs
  • Bands: 31 per channel • Frequency Centers: 20Hz, 25Hz, 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.5kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kHz, 20kHz
  • Control Range: Selectable ±12dB or ±6dB
  • Input Impedance: 50k ohms
  • Output Impedance: 600 ohms
  • Maximum Output Level: +21dB
  • Level Control: ±10dB
  • Signal to Noise: >93dB
  • Distortion: 0.005%
  • Roll-off filters: 18dB/octave, Butterworth
  • Power Consumption: 15 watts

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