amplifier circuit

My project requirement is for an amplifier circuit with an output power of 4.2 channel, 4 x 150w and 2 x 200w, 6 ohm per channel, requiring an input voltage of 48V, and is intended for Audio Amplification. The amplifier circuit should be able to achieve the desired audio output quality, and not require frequent maintenance. Additionally, it should be optimized for low thermal and electrical noise levels, and able to fit within a given space constraint.