NVX 8-inch Complete Powered Subwoofer True 100-watt RMS Low Profile All-in-One Compact Bass Package [QBUS8v2] Compact 10" x 14" design allows the QBUS to easily slide underneath the seat for simple, quick installation Ultra-durable woven fiberglass 8-inch subwoofer delivers clean, crisp bass throughout entire vehicle Included Bass Control Knob allows you to quickly adjust the level of bass for different types of music Speaker-Level Inputs with signal sensing automatic turn-on, allows you to tap directly into your existing speaker wire without running RCA and remote wires Silver-plated RCA connections and wire terminals ensure a tight connection with maximum conductivity 8&#034; Active Enclosed and Powered Subwoofer Frequency Response: 45-150Hz S/N Ratio: &gt; 90 dB THD: &lt; 0.4% Variable Bass Boost (0 to +12 dB bass boost at 45Hz) Speaker-level (high-level) inputs with signal sensing for automatic turn-on Heavy duty die-cast aluminum alloy heat-sink for extreme heat dissipation Silver-plated RCA level inputs Silver-plated screw terminals Input sensitivity: <ul class="a-unordered-list a-vertical"> Level: 110mV-0.5V Variable subsonic filter (20-50 Hz) Variable low-pass filter (50-150 Hz) Phase Shift: 0-180 8 Gauge Amp kit recommended Dimensions: 9.25&#034;<span class="a-text-bold">W</span> x 13&#034;<span class="a-text-bold">L</span> x 2.60&#034;<span class="a-text-bold">D</span> Tested at 14.4 Volts 4-ohm Impedance load &lt;1% THD (Total Harmonic Distortion)