Green, Eco Friendly Class A Monoblocks

Karan Acoustics amplifiers might fit your criteria for 2-channel. They do not draw much current at idle. They also do not get hot.

If I might point out another aspect of 'green', we have an update program that allows any of our older amplifiers or preamps to be updated to the latest level with full warranty reactivation. This helps keep the product from entering the waste stream, prevents obsolescence and supports the resale value.

If you want class A, which IMO is the best-sounding way to go, to keep the energy aspects down you will want a speaker that is high efficiency so you won't have to make a lot of power to run it.

Ralph

Even with a high efficiency speaker though Class A is still not "green" compared to Class D. Right?

My Class A mono blocks use MUCH more electrical then my Class D amp I built.

I used one of these: http://www.amazon.com/P3-International-P4400-Electricity-Monitor/dp/B00009MDBU

Atmasphere - average music power delivered to speakers is very low. It is in order of few watts (few percent of max power) while class A takes up to 8x max power. Class A take the same power all the time. When delivers power to speakers (few watts) it dissipates less in the heatsinks.

Cwlondon - Solar panel for class A won't change anything. It is still "polluting" component since you could return this solar energy to grid and reduce emissions.
Same is true for hydrogen - it is very "dirty" fuel since it wastes a lot (90%)of energy in making it using electricity. The fact that energy might be clean (solar, wind etc) doesn't mean anything since, again, it could be returned to grid instead to reduce emissions. Fortunately it will never see daylight since selling hydrogen would be the same as selling dynamite without permit.

Kijanki, if you have been playing with solar power you know that a lot depends on how long you use an electrical item as well as how much power it draws.

What solar systems I have seen vary from a single 12V deep cycle batter powered by a single solar cell, in which case class D seems like the way to go. I've seen larger systems that could easily operate a class A tube system for an evening without strain. I have a set of 45-based Class A push-pull amps at home that I built as a DIY goof-off project, but they have wide bandwidth and low distortion. As long as you had efficient speakers they would be fine.

BTW I'm putting together an electric truck- its been a 3-year project. Looks like I will get a 100 mile range, if the math is remotely accurate. If there is any interest I can post photos...