Feature: 1. Unique Design: Upgrade your car with a 12 inch active subwoofer with 800W peak power, 400W RMS, 4 ohm. Perfect for car subwoofer enthusiasts, this subwoofer provides excellent bass without sacrificing trunk space. Its spare tire design makes it a unique addition to your car subwoofer system. 2. Premium Bass and Enhanced Safety: Enjoy deep, resonant bass from the spare tire subwoofer designed for mounting inside a spare tire. Hiding from thieves, it delivers clean, uniform sound throughout the vehicle with no vibrations or unnecessary noise. Crisp sound, enough to vibrate your rearview mirror, without causing ear fatigue. 3. Easy Installation: The active powered subwoofer with shallow mounting depth allows for a perfect fit in any spare tire, featuring a flexible rubber surround, built in power amplifier, low level input, reverse mount design, and plug and play installation with included wiring harness. Recommended for spare tire installation. 4. Remote Control and Multiple Function: Wired 16.5ft dashboard remote control with adjustable gain, bass boost, low pass crossover filter, and phase control. Deep, clear bass frequency with automatic turn on and turn off. Soft delayed remote turn on, with thermal, short circuit, and overload protection circuits and adjustable input sensitivity. 5. Sturdy Construction: The car active spare tire subwoofer is made of cast aluminum housing, sturdy and high strength, shock proof, vibration proof and rustproof, wear proof, ensuring long lasting use. Specification: Item Type: Car Subwoofer Size: Approx. 30.48cm / 12in Model: K-BX12APR Subwoofer Unit: Approx. 30.48cm / 12in Voltage: 12V Rated Power: 400W Peak Power: 800W Impedance: 4Ω High Pass Filter: 20Hz Frequency Response: 20Hz-150Hz Low Pass Filter: 50Hz-150Hz High Level Input Sensitivity: 1V Low Level Input Sensitivity: 0.4V Sensitivity: >91DB Bass Boost: 0 to +12dB Total Harmonic Distortion: