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Rockville R7EQ 1/2 Din 7 Band Car Audio Equalizer EQ w/Front, Rear + Sub OutputAmazon$49.99
Warzone EQ6700 1/2 Din 7 Band Car Audio Equalizer EQ w/Front, Rear + Sub Output, Up to 7V RMS of Output, Gold-Plated RCA connectors for Best Audio Output for Car, Boat, RV, RTV, MotorcycleAmazon$54.99
Gravity GR-EQP11 Digital Bass Machine 1/2 Din 9V 4-Way Car Parametric Equalizer w/Front, Rear + Sub Output and Night IlluminationAmazon$45.99
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 SwitchAmazon