The amplifier will operate in class A.
This was admittedly the toughest design decision to make. The following points were all in class A's favor:
The negative points that will need to be addressed in the design:
The amplifier will use power MOSFET's as the output devices.
This was the natural choice for a class A design. Due to the negative temperature coefficient, a power MOSFET that is biased for a high quiescent drain current will be less likely to submit to thermal runaway than one that operates at low levels! Additionally, class A biasing will place the transistor right in the middle of its linear region.
The amplifier will use a power toroid, large bypass capacitors, a star grounding technique and have a safety grounded metal chassis. No power supply regulation will be done.
In addition, the amplifier will be constructed as a dual-mono topology, requiring a separate power supply for each channel of amplification.