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 Black 19" Rack Mount 2 x 21 Band Graphic Equalizer EQ | 42 Total Bands, RCA Inputs/Record Output, 3.5mm Aux Input, Dual VU Meters, LED Display, Removable Rack Ears

Rockville REQ42-B Black 19" Rack Mount 2 x 21 Band Graphic Equalizer EQ | 42 Total Bands, RCA Inputs/Record Output, 3.5mm Aux Input, Dual VU Meters, LED Display, Removable Rack Ears

Product ID: 5110809

🔵Blue LED sliders & multi-color display

🎚️42-band precision EQ

🖥️Dual VU meters for real-time monitoring

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Description

🎛️ Elevate your sound game with precision and style — don’t just hear it, control it!

PRO GRADE RACK READY - Standard 19" rack mount with removable ears for sleek, professional setups.
VISUAL AUDIO COMMAND - Blue LED sliders and dual VU meters deliver instant, intuitive level feedback.
SEAMLESS CONNECTIVITY - RCA inputs/record outputs plus a front 3.5mm aux jack for effortless device integration.
LIGHTWEIGHT DURABILITY - Robust metal chassis at just 6.5 lbs—built to perform anywhere, anytime.
DUAL 21 BAND EQ MASTERY - Fine-tune every frequency from 20Hz to 20kHz with unmatched precision.

The Rockville REQ42-B is a professional dual 21-band graphic equalizer featuring 42 total frequency bands spanning 20Hz-20kHz. Designed for studio and live environments, it offers RCA stereo input/output, a 3.5mm aux input, and a 19" rack-mountable chassis with removable brackets. Blue LED sliders, multi-color displays, and dual VU meters provide precise visual monitoring. Weighing only 6.5 lbs and powered by 110V AC, it’s ideal for DJs, sound engineers, and audio enthusiasts seeking detailed sound control in a durable, compact form.

Specifications

ASIN	B00LZDSL7U
Best Sellers Rank	#57,477 in Electronics ( See Top 100 in Electronics ) #3 in Audio Component Equalizers
Color Name	Black
Connector Type	RCA
Customer Reviews	3.9 3.9 out of 5 stars (1,100)
Date First Available	July 21, 2014
Is Discontinued By Manufacturer	No
Item Weight	6.5 pounds
Item model number	REQ42-B
Product Dimensions	19 x 12 x 6 inches
Standing screen display size	19 Inches

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R$1657

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