CSX-15 Mark II Active Powered 600 Watt Subwoofer Hand Polished Gloss Black Piano Finish Front Baffle. 3/4" High Density MDF Fiber Construction. Bonded and braced at all critical joints, engineered to dampen and eliminate all vibration for transparent and accurate bass reproduction. Front firing subwoofer with "computer tuned bass-reflex slot port system". Black wood grain cabinet finish with spiked footings and floor protection casters. Built-in Linear Class A 600 Watt Dynamic Power Amplifier, RMS Amplifier Power: 300 Watts @ &lt;1% THD, High Current Output stage utilizing 6 Ring Emitter Technology Sanken Studio Grade Japanese Transistors, Lowest Mains Buzz of any subwoofer on the market, guaranteed! High Damping Factor &gt;400 @ 80Hz for Superior Subwoofer Control, 33K Ohm Input Impedance which prevents input signal loss and insures distortion free signal transfer, High Grade, Minimal Loss, Tiffany Style Low Level RCA Input Jacks, Auto Start Turn-On/Turn-Off with Audio Signal 1mV sensitivity, Fully Adjustable Phase Control 0-180 Degrees, Fully Adjustable Low Pass Subwoofer Crossover Frequency Control 40Hz-120Hz @ 12dB per octave, Fully Adjustable Bass Boost Equalizer 0dB to +12dB @ 45Hz, Independent Sub Bass Volume Control, Crossover Bypass Switch for Full Range Unit Operation Option, Slew Rate 80 volts per uS in Full Range, Frequency Response: 10-120Hz +/-3dB LP (10Hz-500Hz ByPass), Signal/Noise Ratio &gt;110dB+, LED Power On Indicator, 110/220 Voltage Selector, Cabinet Size: 19"(w) x 18"(d) x 21"(h) High Power 15" Subwoofer, 2.5" Four-Layer Dupont Kapton Voice Coil Former, 120oz. Heavy Duty Magnet Motor Structure, Extended Pole Piece Technology, Vented and Extended Magnet Back Plate, Double Laminated Surround and Dual Spider Suspension System