Power and real world energy supplies
I'm just wondering if we have misunderstood something here. We must have.
Originally Posted by Idlerman
One of the basic tenets of physics in the known universe is of the conservation of energy. That means that a 20W light bulb cannot behave as if it is a 100W light bulb because if it did, 80W of energy would have been created out of nothing, literally out of the air. And if that principal of energy for free was applied to an economy, a nation, your own heating and lighting bill, you could cut your energy cost by 80% and feel the same warmth, have the same illumination level - everything would continue just as before, only the 80% of the energy you are consuming was coming from the air.
Unlikely? I'd say so. If you want 4 litre car performance (that is the kw/hour energy output of a 4ltr. car engine) you are not going to get that from an engine 80% smaller, namely 800cc (0.8ltr.) are you! So, it really makes no sense at all to compare the power potential of a 20W amp with anything other than another 20W amp. You can't even fairly compare it with a 19W or a 21W amp because their engines have different capacities.
If anyone tells you such utter rubbish as 'tiny amp A has more punch/dynamics than much bigger amp B' they are telling you that they have broken the laws of physics. Clearly they haven't so they are talking utter nonsense. Power cannot be created out of nothing. The power that an amplifier delivers to a speaker overcomes the inertia of the cones and causes them to accelerate and generate sound. If more energy, more power, is available to the speaker there will be more acceleration and more sound. Hence a more powerful amplifier will always beat a smaller amplifier in the acceleration stakes. And that means louder and faster.
Alan A. Shaw
Harbeth Audio UK