Check that there is battery power on the (+) terminal. If problems persist, read the following troubleshooting tips which may help eliminate the problems. The amplifier is built in, so installation and wiring is easy and clean. The Rockville USS8 and USS10 is a low-profile amplified subwoofer. This sub enclosure is only 2.9" thick so that it can easily fit under your seat. Description of USS10: The USS10 is an all in one solution to give you great sounding bass in your vehicle without taking up a ton of space. Position the subwoofer enclosure where you wish to install it. Rockville USS10 10" 800w Slim Under-Seat Active Powered Car/Truck Subwoofer Sub The USS10 is an all in one solution to give you great sounding bass in your vehicle without taking up a ton of space. For the price of around $110 I would recommend the subwoofer, Im happy with it performance. Ch eck taR mo I np u(T r -O ) sl 5VD . Check to make sure you have a good ground connection. Just wanted to make a quick review of what I thought of the Rockville RW10CA 10" subwoofer. ATTENTION: Wear Headphones to Hear Quality! installation with the electrical wiring diagram on the previous pages. This sub enclosure is only 2.9" thick so that it can easily fit under your seat. Amplifier will not power up. Low enough to easily fit below the seat of your car, this system offers you a quick and easy way to add a high-powered subwoofer system to your audio system.