I cant get the slide controls to change any kind of frequency. Can you help?

There is a button that says EQ , if you do not engage the EQ your in bypass mode and there will be no Equalization . So press that button , but turn the volume to a lower level , because when the the EQ is engaged the volume will bump up . And also make sure your connections are correct, stereo out to EQ in . If your not sure if your hook up is correct refer to you Stereo owners manual.

How does the spectrum analyzer work

It's fake- it doesn't represent anything other than the overall level with a completely made-up representation of frequencies.

i have a sherwood receiver and yamaha speakers for outside deck,would this eq work for this?

Depends upon the inputs and outputs for your receiver. Also depends upon whether your receiver supports an equalizer loop. Also depends upon whether you pipe other sources into your receiver or not. Don't take this equalizer outdoors, of course.

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Rockville REQ42-B Dual 21-Band Graphic Equalizer, 19" Rack Mount, RCA In/Out, 3.5mm MP3 Input, LED Indicators, VU Meters, for Studio and Live Sound

Rockville REQ42-B Dual 21-Band Graphic Equalizer, 19" Rack Mount, RCA In/Out, 3.5mm MP3 Input, LED Indicators, VU Meters, for Studio and Live Sound

Product ID: 5110809

🔵Blue LED sliders + multi-color LED display

🎚️2x 21-band EQ for ultra-precise tuning

🖥️19" rack-mountable pro studio form factor

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2234 DH

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Description

🎛️ Elevate your audio game—because your sound deserves the spotlight!

PRO READY RACK MOUNT - Standard 19" rack design with removable brackets fits perfectly into any professional or home studio setup.
LIGHTWEIGHT DURABLE - Robust metal chassis weighing just 6.5 lbs—built to last and easy to transport for live gigs or studio sessions.
SEAMLESS CONNECTIVITY - RCA stereo input/output plus front 3.5mm MP3/iPod jack for effortless integration with all your gear.
VISUAL AUDIO FEEDBACK - Stay in control with vibrant blue LED sliders, multi-color displays, and dual VU meters that track every level.
DUAL 21 BAND PRECISION - Master your sound with 42 frequency bands spanning 20Hz-20kHz for studio-grade audio sculpting.

The Rockville REQ42-B is a professional dual 21-band graphic equalizer designed for precise audio control across a full 20Hz-20kHz range. Featuring a 19" rack-mountable chassis, RCA stereo inputs/outputs, and a front 3.5mm MP3 input, it offers versatile connectivity for studio and live sound environments. Blue LED sliders, multi-color displays, and dual VU meters provide real-time visual feedback, while its lightweight yet durable metal build ensures reliability and portability. Ideal for DJs, sound engineers, and audio enthusiasts seeking detailed sound shaping with professional-grade features at an accessible price.

Specifications

Best Sellers Rank	#23,905 in Electronics ( See Top 100 in Electronics ) #1 in Audio Component Equalizers
Customer Reviews	3.9 out of 5 stars 1,074 Reviews

Reviews

M**.

9.11.2025

M**E

11.01.2024

D**Y

12.02.2026

L**O

8.04.2026

M**S

12.11.2022

D**C

4.06.2019

B**F

16.11.2022

M**.

25.04.2026

K**N

14.12.2025

L**.

4.07.2025

M**Z

13.08.2023

L**N

23.03.2025

J**A

13.08.2025

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