One David 300 (D-Box) Powered Subwoofer for Sale. This Canadian made subwoofer sports a large 120-inch side-firing woofer that's driven by a robust 300-watt amplifier. Used, but in good condition. Below are some of the specifications. * Manufacture: D-Box Audio Inc. * Model: David 300 * Driver: 12 inches * Amplifier: 300 watt * Frequency response: 25 Hz - 160 Hz * Electronic crossover: 12 dB/octave Adjustable from 40 Hz to 160 Hz * Phase correction: Adjustable from 0 to 180 degrees * Inputs: Line level and Hi-level (speakers) * Outputs: Hi-pass, filtered speaker level, 85 Hz, 6 dB/ octave * Enclosure type: Bass reflex * Finish: Black ash vinyl * Dimensions: 15.75"w x 14.90"d x 20.40"h * Net weight: 55 pounds