Features: Rockville APM10B 10" 400 Watt Active Home Theater Subwoofer in Black Every subwoofer in Production Undergoes a Computer Generated Sound Check Test toEnsure it Upholds to our Specifications and Standards We use a "6Sigma" style Quality Assurance of Each Product (Long story short, each product will work perfectly as advertised for a long, long time!) Transducer Production Line to Make the SPL Performance Stable Shiny metal mesh grill Comes in 3 beautiful finishes: Painted Black, Painted White, Vinyl Wood Finish Inputs / Outputs / Controls: Volume control Crossover Frequency Control allows you to adjust low frequency input: 50Hz - 150Hz " TRS input jack Left and Right XLR input/outputs RCA input/outputs Details: Certification: CE and RoHS Compliant Amplifier: Class D, very efficient amplifier with top components! (ST--STA309, ST--STA516, SMPS) Woofer Impedance: 8 Ohm Signal to noise ratio: 98 dB (Maximum output with THD+1