NVX XLCA2 X-Series 2-Channel Line Out Converter Digital Bass Enhancer with xBOOST and Remote Level Control

Suacopzar 9 Band Car Audio Equalizer, Car Graphic Equalizer EQ W/Front, Rear +Sub Output, 8V RMS Line Driver, Frequency Adjustable Audio Output for Car, Boat W/CD/AUX Input, White Light Illumination

AudioControl ACX-3.2 All-Weather Graphic Equalizer and Crossover with Paging Mic

SoundStream BX-10A Bass Restoration Processor with Parametric Bass Equalizer, Digital Bass Processor for Car Audio, Balanced Inputs & Dash Mount Remote Control - Yellow

Skar Audio SKA7EQ 7 Band 1/2 DIN Pre-Amp Car Audio Graphic Equalizer with Aux Input and High Voltage RCA Outputs

Audiobank AP15-1/2 Din Car Audio Digital Bass Processor, Sound Restoration & Crossover for Car Subwoofer with Bass Knob/Input Level: 15V RMS & Output Level: 13.5V Peak -2nd Gen

Taramp's EQ BASS Digital Audio for Control Your Bass Volume, with RCA Output/Input, Perfect Match The Output Signal Levels of virtually al Models of CD/DVD Head Units, Frequency Response to 250HZ.

pizarra EQ-7 Car Audio Headset Amplifier 7-Band EQ Equalizer 2 Channel Audio Mixer Equalizer Digital Sound Equalizer

Stetsom EQX764-7 Band Equalizer, Pre-Amp Car Audio Graphic Equalizer with 4 Inputs (RCA & High) 6 Outputs, 10v Line Driver to Avoid Noise and Dedicated Sub Controls (Level & Frequency)

TOPSTRONGGEAR TSG7EQ 7-Band Car Audio Graphic Equalizer with Front 3.5mm Aux Input, High Voltage RCA Outputs and High Level Speaker Inputs