Guitar Pedal X - GPX Blog - A Brief Hobbyist Primer on Key Tone Stack Types and Circuit EQ Configurations - in collaboration with Master-Builder Adrian 'Thorpy' Thorpe
Amazon.com: Boss GE-7 7-band EQ Pedal : Musical Instruments
Anyone here ever use one of these ? Ayan Smooth and Slim passive EQ | The Gear Page
Align Series Equalizer Acoustic Pedal — LR Baggs
3 Band Parametric EQ | carl
SPL PASSEQ Passive Mastering EQ - Black - Vintage King
SMALL FI 4 BASS CUT LO FIDELITY EFFECT PEDAL PASSIVE EQ HIGH PASS FILTER LOW | eBay