* 15 powered subwoofer * Attached wheels on the subwoofer * Limit Indicator lets you know when built-in limiter is active * Signal Indicator glows when when there a signal is received to the Full Range input * Subwoofer gain control knob regulates the output level of the subwoofer and set balance between the speakers and subwoofers. * Protect Indicator glows when the subwoofer goes into protect mode which prevents the subwoofer amplifiers from getting too hot and stops all output * Power LED indicates power is on * Phase switch for reversing polarity of subwoofer * Full range XLR input * High Pass XLR output * Thru full range output * Built-in pole mount socket * Built-in carrying handles Specs * Component: 15 Woofer (4 Ohm) * Dimensions: 23.7L x 17.2W x 23.5H * Weight: 88 Lbs. * Environmental conditions: Operational temperature: 5 to 35C (41 to 95F) * Operational humidity: 25 to 85% RH (non-condensation) * Storage temperature: -20 to 60C (4 to 140F) * Frequency response: (-3db): 45Hz ~ 120Hz * Frequency range: (-10db): 35Hz ~ 120Hz * Maximum SPL at 1m: 126db * Peak output at 1m: 129db * Crossover frequency: 120Hz (12db/octave) * Input type: balanced differential * Input impedence: 50k * Input protection: Level protected * Thermal protection: Input stage muting auto-reset * Low-Frequency transducer diameter: 15 * Voice coil diameter: 4 * Low-Frequency Power Amplifier: Rated Power 500W continuous 700W peak * Rated THD: < 0.03% * Cooling: Passive-Heatsink with speed sensitive electric fan