<https://www.presentationgo.com/presentation/simple-equalizer-diagram-powerpoint-google-slides/#webpage>
<http://schema.org/description>
"Free simple equalizer diagram for PowerPoint. 5 vertical bars with circles to be manually adjusted for the required (custom) frequency. Editable graphics."
<https://www.presentationgo.com/presentation/simple-equalizer-diagram-powerpoint-google-slides/>