Cadence QSA-8.1D Single 8" Active Subwoofer Enclosure Specifications RMS Power Handling: 200 Watts PEAK Power Handling: 400 Watts Frequency Response: 40Hz - 150Hz SPL @ 1w/1m: 90dB System Impedance: 4-Ohm Dimensions (L x W x H): 12.6" x 12.6" x 3.4" (32cm x 32cm x 8,64cm) Features • 8" Slim Woofer • Built-in Class D Mono Block • MosFET PWM Power Supply • Thermal, Overload, and Speaker Short Protection • Soft Delay Remote Turn-On Circuitry • Variable Gain Control • Variable Phase Shift • Variable Low Pass Filter: 50Hz - 150Hz • Variable Subsonic Filter: 20Hz - 50Hz • Variable Bass Boost: 0dB to +12dB • S/N Ratio: > 90dB • Fuse Rating: 20 amps x 1 • Remote Level Control • RCA Low Level Inputs • High Level Inputs • Power and Protection LED Indicators