The US Department of the Interior Bureau of Mines has studied exactly that, see here.Originally Posted by Malcolm McLeod
In actual practice, like Larry said, it's not quite as easy as it looks in that report.
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The US Department of the Interior Bureau of Mines has studied exactly that, see here.
In actual practice, like Larry said, it's not quite as easy as it looks in that report.
Beranek's Law:
It has been remarked that if one selects his own components, builds his own enclosure, and is convinced he has made a wise choice of design, then his own loudspeaker sounds better to him than does anyone else's loudspeaker. In this case, the frequency response of the loudspeaker seems to play only a minor part in forming a person's opinion.
L.L. Beranek, Acoustics (McGraw-Hill, New York, 1954), p.208.
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Thanks, David. Well worth the read!
For others not so inclined, test was for duct discharge, not intake, but test conditions are close approximation to those seen by common shop DC. And I dimly recall from Gas Dynamics that inlet turbulence is higher than outlet (worth consideration?). Article is from 1987 and I wonder how modern electronics - - and Amazon marketplace - - would impact a repeat?
Last edited by Malcolm McLeod; 01-29-2020 at 7:15 PM.
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Yes, momentum is definitely in your favor on an outlet. I don't think the issues with this measurement have much to do with the generation of the electronics though. This is a case of the measurement physically changing the characteristics of the system under test, not a very desirable situation.
Beranek's Law:
It has been remarked that if one selects his own components, builds his own enclosure, and is convinced he has made a wise choice of design, then his own loudspeaker sounds better to him than does anyone else's loudspeaker. In this case, the frequency response of the loudspeaker seems to play only a minor part in forming a person's opinion.
L.L. Beranek, Acoustics (McGraw-Hill, New York, 1954), p.208.
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