F113 Gloss - JL Audio 13.5" Fathom Series Powered Subwoofer, Black Gloss Finish Enclosure Type: Sealed Enclosure Finish: Black Gloss Frequency Response (Anechoic): 20 - 86 Hz (1.5dB) -3 dB at 18 Hz / 127 Hz -10 dB at 16 Hz / 154 Hz Effective Piston Area (Sd): 107.35 sq in / 0.0693 sq m Effective Displacement: 386 cu in / 6.3 L