Those of you worried about Class A amps' energy cost, all you have to do is skip one domestic airline flight and you could run your amp for nearly 7 years, 2 hours a day.
Domestic flight (~1000 mi):
1609 km × 246 g CO₂/km = 396 kg CO₂
396 kg CO₂ ÷ 3.15 kg CO₂/kg fuel = 125.7 kg jet fuel
125.7 kg × 43 MJ/kg = 5,405 MJ = 1,501 kWh
Class A amp (300W):
1,501 kWh ÷ 0.3 kW = 5,003 hours
5,003 hours ÷ 2 hrs/day = 2,500 days ≈ 6.8 years

