ACE-A1K1 Monoblock Class D Car Amplifier – 2000W Max Power The ACE-A1K1 is a 1-channel Class D amplifier engineered for high-performance subwoofer applications. It delivers stable, efficient power while maintaining. The ACE-A1K1 is a 1-channel Class D amplifier engineered for high-performance subwoofer applications. It delivers stable, efficient power while maintaining excellent reliability. Its rugged construction ensures consistent output even under demanding conditions, making it the ideal choice for serious car audio setups