Max NVX - QBSTA 900W 11in Powered Spare Tire Subwoofer Box with Built-in Amp and Remote Bass Knob qbsta (300W RMS)Product Details: 11" Powered Spare Tire Subwoofer System. Mounts to hub of spare tire. Compatible with spare tires mounted inside vehicle with removable spare tire post. Built-in Class D Amplifier 900W Peak (300W RMS). Top-mount amplifier controls. Variable low-pass filter: 50-180 Hz, 24dB/octave. Bass Boost: 0-12 dB at 50 Hz. Subsonic filter: 10-50 HZ. Phase Shift: 0-180° . Frequency response: 20-180 Hz. Lightweight Polypropylene cone with Rubber Surround. Heavy duty die-cast aluminum enclosure. Signal sensing for automatic turn-on. Input level sensitivity: . Low-level Input: 200mV - 4V. Speaker-level Input: 500mV - 10V. Wired remote bass level control included. 8 gauge power and ground wiring i… $274.99BestBuy.comDelivery: in USA ReportBuy!