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<blockquote data-quote="helotaxi" data-source="post: 4252555" data-attributes="member: 550915">I think I have one bass CD (from like &#039;92) that has more than a couple cycles of a pure sine wave that&#039;s on something other than a test track.&nbsp; There&#039;s no &quot;beat&quot; to a sine wive it&#039;s just a monotone hum.&nbsp; Pretty boring.&nbsp; All sound is composed of sine waves.&nbsp; It&#039;s just that you either don&#039;t have many cycles of a given freq or that you have multiple freqs overlaid on each other such that the summed output no longer looks like a pure sine wave.&nbsp; If you were to break out the individual tones and plot them all you would see a bunch of sine waves.The freq of the tone has nothing to do with the level.&nbsp; Setting the gain with a 50hz tone or a 40Hz tone is irrelevant.&nbsp; The amp should have a flat frequency response so if the gain is set with a 0dB 50Hz tone and then you test it with a 40Hz 0dB tone you should get the same voltage.&nbsp; If you don&#039;t, either you have a filter that is affecting the response at 50 or 40Hz or the amp sucks.</blockquote>

[QUOTE="helotaxi, post: 4252555, member: 550915"] I think I have one bass CD (from like '92) that has more than a couple cycles of a pure sine wave that's on something other than a test track. There's no "beat" to a sine wive it's just a monotone hum. Pretty boring. All sound is composed of sine waves. It's just that you either don't have many cycles of a given freq or that you have multiple freqs overlaid on each other such that the summed output no longer looks like a pure sine wave. If you were to break out the individual tones and plot them all you would see a bunch of sine waves. The freq of the tone has nothing to do with the level. Setting the gain with a 50hz tone or a 40Hz tone is irrelevant. The amp should have a flat frequency response so if the gain is set with a 0dB 50Hz tone and then you test it with a 40Hz 0dB tone you should get the same voltage. If you don't, either you have a filter that is affecting the response at 50 or 40Hz or the amp sucks. [/QUOTE]

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