5 Band Parametric Equalizer & Pre-Amp Subwoofer Gain Control - Amplifier - Audio Accessories
DS18 EQX5 8 Volt 5 Band Car Stereo Equalizer Subwoofer Control RCA Speaker Input 810005184922 | eBay
Planet Audio PEQ15 5-Band Parametric Equalizer with Sub Output — The Wires Zone
Amazon.com: 7 Bands Graphic Equalizer with SUB Volume Adjustable for Subwoofer Channel, Built in Bluetooth for Wireless Music Streaming, Stereo RCA Output, Aux RCA Input, Mounting Hardware Included : Electronics
2/3-Way 6-Channel Electronic Crossover Subwoofer Equalizer for Car Audio System | eBay
Lanzar 4 Band Parametric Equalizer with Subwoofer Gain Control - Walmart.com
EQ9 - 9 Band Car Audio Graphic Equalizer
AEQ-4XOA Equalizer
Amazon.com: Audiotek At-eq500 Eq500 5-Band Graphic Equalizer with Subwoofer Output and Cd/Radio Selector Switch : Electronics