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Of course, audio gear only represents a small part of total energy consumption, but it all adds up. There are similar mandatory EU standards for other equipment such as televisions, refrigerators or washing machines. In many cases the current models only consume about a quarter of that by their ancestors of some fifteeen years ago. It incentivizes technological innovation and stops manufacturers being lazy.
I bought a new "Energy Efficient" LG Dryer and it's no more efficient than my 25 year old unit. It tries to reduce energy by turning off the heating element but then the load runs twice as long. If you are willing to wait 2x-3x as long you might save 5% in energy but maybe not. As this design is a bit stupid the controls also offer "Manual" mode which costs 5 cents more to run but gets the load dry in 30 minutes instead of 82. It's an energy Ponzi scheme. Luckily, other "Energy saving" devices save more, but a heat pump dryer can never be paid for in energy savings at 3x the purchase price.
