Orion XTR Series XTR10US Under Seat Powered Car Subwoofer Shallow Enclosure,

This shallow-mount powered subwoofer is engineered for cars, trucks, and SUVs where space is limited but high-quality bass is essential. Orion XTR Series XTR10US Under-Seat Powered Car Subwoofer – 10” Slim Active Sub, 1200W Max / 300W RMS.

eBay