Dayton Audio Signature SS18-PR Passive Radiator

The Dayton Audio SS18-PR Signature Series 18" Passive Subwoofer is a premium passive radiator designed to deliver deep, authoritative low-frequency extension to any high-performance audio system. As a dedicated passive emitter, it requires no amplifier connection, instead relying on the pressure from an active driver to produce clean, powerful bass. This makes it an ideal solution for audiophiles and home theatre enthusiasts seeking to augment their existing subwoofer setup or build a custom enclosure that achieves subsonic output without the complexity of a second powered driver.

Engineered for versatility, the SS18-PR excels in sealed or ported enclosures where extended low-end response is desired. Its large 18-inch nominal diameter and substantial displacement volume of 5375.7 cm³ allow it to move significant air, producing deep, room-filling bass with minimal distortion. The passive radiator is particularly effective in systems where space is limited, as it can replace a long port tube while delivering comparable or superior low-frequency extension.

Technically, this unit features a lightweight yet rigid aluminium frame that ensures durability and reduces unwanted resonances. With a resonance frequency of just 20 Hz, it is optimised for precise subsonic performance, while the mechanical loss factor (Rms) of 5.92 ensures controlled, accurate cone movement. The 8-hole mounting pattern and 427 mm cut-out diameter simplify installation into custom enclosures. Finished in a sleek, professional design, the Dayton Audio SS18-PR is a robust choice for those serious about achieving the deepest, cleanest bass possible.