JBL Basspro SL2 8" Class D Compact Underseat Subwoofer w/ Bass Control – theWinkel
10-Inch Low-Profile Amplified Subwoofer System - 900 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built In Amp, Powered Car Subwoofer w/ Low & High Level Inputs - Pyle PLBX10A - Walmart.com