The Kenwood KAC-9105D mono subwoofer amplifier is a powerful, reliable, and compact solution for enhancing your car audio system. With 500 watts RMS x 1 at 4 ohms (900 watts x 1 at 2 ohms) output, it delivers superior sound quality. The Class D design, variable low-pass filter, and bass boost ensure optimal performance and flexibility for customization. Its 1-ohm stability and rugged construction make it ideal for pushing your system to the limit. The included cooling fans and cast-aluminum heatsink ensure long-term reliability, even during heavy use.