The Episode Signature Preconstruction In-Wall/In-Ceiling Subwoofer Enclosure increases sound performance by adding consistent air volume. The preconstruction enclosure is capable of housing a single subwoofer in the ceiling. This enclosure has a minimal footprint, so you can easily hide subwoofers anywhere – small or large rooms, theatres, distributed audio, and more. This enclosure is compatible with Episode Signature Passive Free Air Subwoofer. It must be purchased separately.