Q Power HD115 VENT SQ Single 15-Inch Vented Custom Speaker Box for Kicker L7 Subwoofer Custom Designed for Kicker L7 Subwoofer Heavy Duty 1" MDF Easy GOLD Puch Button Terminal Cups. Premium Charcoal Colored Carpet Air Space - 2.7 Cubic Feet. Tuning Frequency - 32 Hertz