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

Soundstream BX-12 – Bass Processor | Car Audio Bass Restoration Processor with Remote Control | Epicenter Alternative for Factory & Aftermarket Sound Systems and Subwoofer Bass Booster

HIFONICS Zeus Digital BASS Enhancement

B00FA65FNQ

AudioControl The EPICENTER Concert Series Digital Bass Restoration Processor, Car Audio Bass Booster Enhancer with Included Dash Mount Wired Remote Control Knob, ParaBASS, Subsonic Filter (Black)

AudioPipe XV-BXP-SUB 15V Car Audio System Digital Sound Equalizer Epicenter Enhancer Restoration Signal Processor Bass Booster w/Remote Knob, Black

Blaupunkt EP1200X Digital Bass Enhancer Bass Note Restorer

Blaupunkt EP1000X Digital Bass Enhancer Bass Note Restorer

B07XJ77BHB

Sound Storm Laboratories S4EQ 4 Band Pre-Amp Car Audio Stereo Equalizer - Gold-Plated Front/Rear and Subwoofer Outputs

Lanzar Parametric Equalizer with Subwoofer - 9 Volt RMS Pre-Amp Output with Voltage Meter, Subwoofer Gain Control & Bass Driver, 3 Input Sources Selectable, Pre-amp Line Aux Inputs Via RCA Jacks

SSP 2.8 Digital Signal Processor & Equalizer – 15-Band Graphic EQ, 2 Input/8 Output, 12 Presets, Built-in Crossover for Car Audio Enhancement

Timpano 7 band equalizer TPT-EQ7 10V High Voltage Line Driver 6 Channel RCA Output and Subwoofer Control and Crossover 1/2 Din Graphic Car Audio Eq with High Level Input

Massive Audio EQ7X | 7-Band Car Audio Equalizer with 8V Line Driver, Subwoofer Control & Adjustable Fader - in-Dash EQ for Studio-Quality Sound

Gravity GR-EQP11 Digital Bass Machine 1/2 Din 9V 4-Way Car Parametric Equalizer w/Front, Rear + Sub Output and Night Illumination

Gravity EQ15 1/2 Din Five Equalization Bands Car Audio Equalizer EQ Front, Rear +Master Volume Control with up to 9 Volts RMS of Output/Three Stereo RCA Output

Lanzar 4 Band Parametric Equalizer - 7V RMS Output with Subwoofer Gain Control, Half Din Size 7 x 4.1 x 1 in, Pre-amp Line Aux Inputs Via RCA & Phone Jacks, Blue Light, DC 12V with Remote Trigger