Get big sound from a compact source with the Boss AR4000D Class D Monoblock Amplifier. With a slimmer chassis, this Boss Monoblock Amplifier is the perfect tool when space is limited and power is required. This highly efficient and powerful Class D Monoblock Boss Amplifier is suitable for subwoofers and drivers who want their music to make an impression. The combination of feature-rich performance and ease-of-installation makes this amp the perfect choice for owners of any kind of automobile. Indeed, this marriage of power and convenience is hard to find in the automotive environment--so much so that it may well be forging its own product category. If you want rich sound and unmatched simplicity, consider buying the Boss AR4000D Class D Monoblock Amplifier. Boss AR4000D Class D Monoblock Amplifier: * Easy installation * Feature-rich performance * Small interface has powerful amp resonance * Max Power, 1 Ohm: 4000W x 1 * Max Power, 2 Ohms: 3000W x 1 * RMS Power, 4 Ohms: 1600W x 1 * Signal-To-Noise Ratio > 105 dB * THD 0.01 percent