This SA series in-wall subwoofer features an in-wall depth of 9” and sealed aircraft grade aluminum enclosure. James all new proprietary woofer design promises high power handling and low distortion to deliver audiophile-quality where it counts. Combined with a high output 8" (203mm) aluminum woofer and an all new band pass cabinet design, the SA81-9-SUB has an impressive 89dB sensitivity with bass down to below 33Hz. When combined with our M1000 DSP amplifier, this unit delivers over 350W of pure audio performance. The sealed cabinet design features all aircraft aluminum construction for strength, and sonic performance. An aluminum grille provides a subdued visual effect, designed to be as unobtrusive as possible.