I copied this description from elsewhere, but let's just say that this thing is loud. And I don't need it. It came with a car I bought. I have no wires or accessories. Just what you see in the pictures. It measures 18 inches wide, by 13 inches tall. The top is 6 inches deep and the bottom is 9 inches deep.
At http://www.rockfordfosgate.com/products/details/r300-10 it is listed for $279.
ROCKFORD FOSGATE R300-10 300 Watt 10" Powered Subwoofer+Remote Bass Level Control Included Features: Subwoofer Features: "Closed-loop" design ensures optimum performance between woofer, amplifier and enclosure Adjustable 12db/Octave low pass crossover Built-in 0°/180° phase switch Built-in adjustable bass boost EQ Constructed with 5/8" MDF High-efficiency, low current design Industrial grade carpet Inteligent auto turn on/off fuction Large AWG input terminals Proprietary high output woofer Remote bass level control included Robust Power/Ground connections Seperate low level and speaker level inputs Termal and over voltage protection Encased in industrial grade black carpeting Amplifier Features: BTL Class D high efficiency, low current power supply Wired remote bass level control included LED power and protect indicator Variable Bass Boost (0 to +12 dB bass boost at 45 Hz) Mono channel operation 2-Way System Protection circuitry (thermal and overload) Speaker-level inputs with signal sensing for automatic turn-on Heavy duty extruded aluminum alloy convection heatsink for maximum heat dissipation Nickel-plated RCA level inputs Nickel-plated compression terminal block.