The ALC4 is a combination of a speaker controller and power amplifier. The ALC units are designed to guarantee the best speaker drive, with maximum sound quality and operating reliability. The amplifier stage consists of a 2x 2kW (2 ohms RMS) Class G design. The combination of double conventional power supplies with a massive 400 Joules capacitor bank makes the ALC4 deliver dynamic and sustained very high power output. The controller section consist of several stages; On the input stage the SDP circuit and on the output stage the SIS circuit ensure easy, reliable and optimised speaker response.