REQ231 V2: How To Set Up & Use

Introduction

The Rockville REQ231 is a dual 31-band graphic equalizer designed for live performances, DJ events, and studio applications. This 2U rack-mountable unit gives you precise control over sound frequencies, allowing you to fine-tune your mix for optimal performance.

This guide will cover:
✅ Installing the REQ231 into a rack unit
✅ Connecting the EQ to a passive mixer, power amp, and passive speakers
✅ Adjusting the frequency bands for sound optimization
✅ Using the EQ with individual mixer channels for precise control

What’s Included?

• Rockville REQ231 Dual 31-Band Graphic Equalizer
• Power Cable

Step 1: Rack-Mount Installation (Optional)

The REQ231 is rack-mountable (2U size) for professional setups.

1. Align the screw holes on the equalizer with the rack mount.
2. Secure the unit using two screws per side to lock it in place.

✅ Tip: If mounting in a rack, remove the rubber feet at the bottom for a better fit.

Step 2: Connecting the REQ231 to a Mixer, Power Amp, & Passive Speakers

1. Connecting the Equalizer to a Passive Mixer

You can use XLR cables or ¼” (TRS) cables for this setup.

Using XLR Cables:

1. Take two XLR cables and plug the female ends into the main outputs of the passive mixer.
2. Plug the male ends into the XLR inputs (Channel 1 & 2) on the REQ231.

2. Connecting the EQ to a Power Amplifier

1. Take another pair of XLR cables.
2. Plug the female ends into the XLR outputs on the EQ.
3. Plug the male ends into the XLR inputs of the power amplifier.

3. Connecting the Power Amplifier to Passive Speakers

• Use Speakon cables or ¼” speaker cables to connect the left and right channels of the power amp to the left and right passive speakers.

✅ At this point, your signal flow is:
🎛 Mixer → REQ231 Equalizer → Power Amp → Passive Speakers

Step 3: Adjusting the EQ Settings

1. Understanding the 31 Frequency Bands

The REQ231 provides 31 frequency bands per channel, allowing independent control over the left and right speaker outputs.

• Bass Frequencies (20Hz - 275Hz) – Adjusts deep, low-end sounds.
• Midrange Frequencies (250Hz - 4kHz) – Affects clarity and body of vocals and instruments.
• Treble Frequencies (4kHz - 20kHz) – Controls brightness and sharpness of high-end sounds.

2. Using the Built-in Features

• Bypass Switch (Per Channel) – Turns the equalizer on or off to compare processed vs. unprocessed audio.
• I/O Meter Button –
  • Pressed In: Displays output levels on the LED meter.
  • Unpressed: Displays input levels on the LED meter.
• Low-Cut Knob (Per Channel) – Cuts out frequencies below 40Hz, ideal for setups with a subwoofer.
• High-Cut Knob (Per Channel) – Cuts frequencies above 30kHz, useful for eliminating unnecessary ultra-high frequencies.
• Range Button – Adjusts gain boost/cut range between ±6dB or ±12dB for more precise control.
• Input Knob (Per Channel) – Adjusts the input gain to set an optimal signal level.

Step 4: Testing the Sound with & Without the EQ

🎵 To test how the EQ improves your sound:

1. Start playback with the EQ turned OFF.
2. Turn the EQ ON midway to hear the enhanced sound.

🔊 You should notice:
✅ Boosted bass & clearer mids
✅ Sharper treble frequencies
✅ Overall improved sound definition

Step 5: Using the REQ231 with Individual Mixer Channels

If your mixer has insert jacks for each channel, you can apply the EQ to a single channel instead of the full mix.

1. Using a ¼” Y Cable (Insert Cable)

1. Take the single ¼” end and plug it into the insert jack of the mixer channel you want to equalize.
2. Take the two split ends and:
   • Plug one into the input of the EQ.
   • Plug the other into the output of the EQ.

✅ This setup lets you fine-tune only one instrument or microphone input instead of affecting the entire mix.

Final Thoughts

The Rockville REQ231 is a high-precision 31-band equalizer that significantly enhances clarity, bass response, and overall balance in your live performance or DJ setup. Whether you're tuning an entire mix or adjusting a single channel, this EQ provides professional-level sound control.