leolucchesi
A system can indeed sound better at night than during the day or better one day compared to another day quite significantly.This has to do with the power itself in your region and how people are using it at the listening moment. The more power is used by the population, the less you have for your hifi, that's really a fact.It may be a fact in third-world or developing countries, but certainly not in any industrialized nation, unless there is something badly wrong with your local utility. There is plenty of power to supply everyone. Quantity isn't the problem.