I've got some old speakers that I'm planning to power using this 2x50W amplifier(link)(I'm open to suggestions of a better quality to price amp). To power the amp I was thinking of using an old ATX 400W Power supply(link) and connecting the four 12V wires.
100W(power requirement)/12V(supply) = 8.3A(being drawn from the psu)
Therefore, if the psu uses 20AWG wire(with about 5A ampacity):
4(wires) * 5A = 20A(maximum usage)
Would this be enough of an amperage gap to prevent wires from overheating, or does this design pose a large fire hazard?
Thanks for the help.