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<blockquote data-quote="Water Bear" data-source="post: 8821293" data-attributes="member: 673826">This raises an interesting question regarding how you&#039;d even compare the efficiency of one amp to another on music. One way: Measure the output power and input power over the whole song (as a function of time), then divide the two totals (the same as average output power divided by average input power). It&#039;s hard to make it apples-to-apples...one way is to adjust gains until the two amps under test have about the same total output power. None of that necessarily tells you exactly what you want to know and there&#039;s a dozen ways to do it depending on what you&#039;re after. I&#039;ve never seen anyone do anything like this on Youtube and I don&#039;t even know what instruments you&#039;d need - none of the common ones output a recording, usually just a max reading. You&#039;d probably need actual lab instruments.Edit: Another way is to measure the efficiencies at different frequencies (something you can do with available tools) then do an FFT of the song you&#039;re playing and try to do some math from there. This&#039;d work only if the whole song is played at whatever level you took your per-frequency readings at.</blockquote>

[QUOTE="Water Bear, post: 8821293, member: 673826"] This raises an interesting question regarding how you'd even compare the efficiency of one amp to another on music. One way: Measure the output power and input power over the whole song (as a function of time), then divide the two totals (the same as average output power divided by average input power). It's hard to make it apples-to-apples...one way is to adjust gains until the two amps under test have about the same total output power. None of that necessarily tells you exactly what you want to know and there's a dozen ways to do it depending on what you're after. I've never seen anyone do anything like this on Youtube and I don't even know what instruments you'd need - none of the common ones output a recording, usually just a max reading. You'd probably need actual lab instruments. Edit: Another way is to measure the efficiencies at different frequencies (something you can do with available tools) then do an FFT of the song you're playing and try to do some math from there. This'd work only if the whole song is played at whatever level you took your per-frequency readings at. [/QUOTE]

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