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In Reply to: RE: What a gyp. posted by Jaundiced Ear on August 18, 2014 at 17:44:02
"If the fan audibly changes the "sound" of the audio output, surely there must be a measurable change to the audio output itself."Not to be a nit, and I agree with what you say, but the fan still could be effecting something else other than the audio output that is effecting the sound. Think of a silent fan, then think of how it would effect the sound traveling through it - as an example of the audio output not changing but the perceived sound being different.
If it "sounds" different then the measurements at the listening position must be different otherwise something within the listener himself is different.
Give me rhythm or give me death!
Edits: 08/21/14Follow Ups:
but we're talking about a cooling fan inside a Macintosh computer. Presumably the speakers are not also inside the Mac so any acoustic effects the fan may have on the speakers should be pretty minimal. Now if we are talking about the Mac's built in speakers then the fan will be the least of your worries!
JE
That was just an obvious example. A fan being on could require a higher current draw, add noise on the power line or otherwise effect other devices outside the PC case in such a way that they create more noise and effect the perceived sound without changing the audio output.Point is it is not good enough to just measure the audio output if a difference is heard.
Give me rhythm or give me death!
Edits: 08/21/14
Fair enough, but now I think we are conflating changes to the electrical waveform and changes to the acoustical environment. Both can have significant effects on what we hear, but I think it's best to debate the two issues separately.
JE
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