Open Box merchandise are products that have been purchased and delivered to other customers, and then returned to Monoprice. Due to the varying quality of products returned, we make every attempt to supply the original accessories for Open Box products. However, Monoprice only guarantees that you will receive the product itself, accessories may or may not be included. Bear in mind that your open box product may not contain cables, adaptors, manuals, CDs, drivers, etc. Additionally, the product may exhibit cosmetic imperfections as a result of its having been previously opened. This Open Box product comes with a 90-day Limited Product Warranty.Monolith™ by Monoprice™M‑IWSUB82 Dual 8' In‑Wall SubwooferAdd powerful bass to your in‑wall or in‑ceiling home theater systemThe Monolith™ by Monoprice™ M‑IWSUB82 Dual 8' In‑Wall Subwoofer adds powerful bass to your in‑wall or in‑ceiling home theater system. Equipped with two high‑end, compact, 8' polypropylene woofers, heavy duty mounting tabs, and a paintable magnetic grille, the M‑IWSUB82 can be used in both new construction or seamlessly added to existing systems. The 91dB sensitivity ensures an easy pairing with just about any amplifier. The Monolith by Monoprice M‑IWSUB82 Dual 8' In‑Wall Subwoofer is designed to add thunderous bass, without taking up valuable floor space.Dual 8' passive in‑wall subwooferTwo polypropylene cones with rubber surroundsHeavy‑duty mounting tabs for easy installationDesigned to fit within standard 16' wood stud wallsMagnetic, paintable grilleSpring‑loaded binding posts36 ~ 200 Hz frequency response91dB sensitivity PREMIUM DRIVERSHIGH EXCURSION, COMPACT SUBWOOFER.The Monolith™ M‑IWSUB82 features two 8' polypropylene cone subwoofers with rubber surrounds to provide ample bass in a home theater, audio, or media installation.EASY INSTALLThe heavy‑duty mounting tabs make for a fast and problem free installation. The magnetically detachable grille is powder coated in white and can be painted to match any decor. .