Procella V18 subwoofer low frequency performance to 11Hz.
Flex 10" Low-Profile Subwoofer | UTV Stereo
Planet Audio P10AWK 10 Inch Under Seat Powered Car Audio Subwoofer - 1000 Watts Max, Low Profile, 8 Gauge Amplifier Installation Kit Included. For Truck, Boxes and Enclosures - Walmart.com
LOPRO8 | Sound Storm Labs
Amazon.com: PyleUsa 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 - PPLBX10A :
10" Wireless Low-Profile Subwoofer Package with Dayton Audio SUB-1000L