Amazon.com: SoundXtreme ST-EQ755 1/2 Din 7 Band Car Audio Parametric Equalizer EQ with Front, Rear + Sub Output 8 Volt RMS Three Stereo RCA Output Built-in Input AUX / DVD Select Switch : Electronics
Parametric EQ | EQ like a pro online | Soundation
Parametric EQ explained: What is a parametric equalizer?
The dbx 530 - dbx 500 Series EQ - dbx 500 EQ - Vintage King