Taramps Pro 2.8S Black DSP Crossover Full Digital Signal Audio Processor and Equalizer with sequencer 15-Band Graphic Equalization 12 preset EQ 2-Channel in and 8-Channel Out Car Audio, Sound Quality

Stetsom STX 2848 PRO - DSP Crossover & Equalizer 8 Channel Full Digital Signal Processor (Sequencer) 2.8, Audio Processor, Limiter, Sequencer, 2 RCA Input, Full Digital Signal Audio

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.

Massive Audio EQ7X Car Equalizer with 7 Band Graphic Equalizer Aux inputs Sub Output Active Gain Preamp 8v Line Driver - 12dB Crossover Auto Hi-Low Line Input

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)

HIFONICS Zeus Digital BASS Enhancement

Autotek 4-Band Audio Equalizer with Built-in 2-Way Crossover, 9 Volts, 1/2 DIN, re-amp EQ with Front/Rear Active Crossover, and Selectable 12dB high-Pass Crossover PK1

New AUDIOPIPE XV-3 3-Way Electronic Crossover with Line Driver + Bass Knob XV3

DS18 EQX7PRO Audio Equalizer/Crossover High Level Input 7-Band Auto Turn On, Subwoofer Output, Adjustable Filters, High Volt Led Indicator, RCA Input - Great for Finely Adjusting Amplifiers Ranges