Optimus Prime's Stereo Equipment Old School Audio - Old School Prices - Professionally Tested Product Description This is a Sony SS-WMSP80 passive subwoofer in a distinctive silver cuboid enclosure with a front-firing woofer and front-ported bass reflex design. The unit has been bench tested and confirmed working — the driver reproduces bass cleanly with no rattles, buzzing, or distortion at test levels. Cosmetically the cabinet shows light wear and some dust marks on the grille-covered cone surround consistent with normal use, with the enclosure itself in good overall shape. Please review all photos for details. Highlights At A Glance ✔ Fully tested and verified ✔ Good cosmetic condition with light wear and surface marks from use ✔ Free 30-day returns ✔ Fast, insured shipping Testing & Verification The woofer driver was tested for clean, full-range bass reproduction with no distortion, rattling, or voice coil rub. The spring-clip binding posts on the rear panel were checked for solid contact and continuity. The port and enclosure were inspected and confirmed free of rattles and internal debris. Shipping & Returns Fast, insured shipping from Minnesota. Free 30-day returns. Item is carefully packaged for safe delivery.