No problem with turning the amp off when not in use! Won't affect sound quality - contrary to what the neurotically obsessed will claim! And using a cooling fan will not harm the amp either!
Keeping a Peachtree Nova 300 Cool
Recently acquired the unit and have noticed that the unit runs quite hot contrary to what I've read about class d amps operating temperatures. I want to leave the amp on when not in use, so I have an Aircom Acinfinity cooling unit sitting over the vents on top to draw heat out. Will keeping this unit cooler than it's normal operating temperature be detrimental to sound quality or it's longevity? I've read of quality issues with these amps, it seems alot of them are related to turning the unit off and on, so I would prefer to leave on unless doing so would be detrimental by running it with lower operating temps.