Amazon.com: Nobsound Auto Car Amplifier Audio Subwoofer Bass Control Knob Sub Gain Equalizer Regulator Frequency Controller RCA Line Level Adjust : Electronics
PSB-1000DSP Subwoofer Amplifier with RS-232 / IR Remote Control, Dual – Soundavo
Sound Storm Laboratories US10 10 Inch Under Seat Powered Car Audio Subwoofer - 1000 Watts Max, Low Profile, Built in Amplifier, For Truck, Boxes and Enclosures, Remote Subwoofer Control - Walmart.com
BOSS Audio Systems BAB8 8 Inch Powered Under Seat Car Audio Subwoofer - 800 Watts Max, Low Profile, Remote Subwoofer Control, For Truck, Boxes and Enclosures - Walmart.com