The two power amplifiers fitted to the A1 can, respectively, deliver 700 W +200 W continuous sine wave power into an 8 ohm load - increasing to 1200 W + 350 W continuous sine wave power into a 4 ohms load. These output ratings are valid for at least 30 minutes of operation at an ambient temperature not exceeding 24 C. Continuous sine wave power rating represents an extreme of operation not normally encountered when reproducing typical speech and music signals - both complex waveforms with average power levels usually well below their peak power level. Even when driving a d&b active system with highly compressed music (2:1 crest factor), the A1 will operate indefinitely - provided of course that the amplifier cooling system has sufficient cool airflow.