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In Reply to: RE: Bernoulli's Principle posted by Bill Fitzmaurice on May 27, 2015 at 16:23:50
nt
Follow Ups:
Why the "hit and run" nt?
Fluid DOES compress.
That's why sound waves can travel through the oceans, to be heard by the supposedly endangered whales.
:)
In a closed vessel, true. That's why we use hydraulic fluid in any number of applications rather than air. But a speaker port isn't a closed vessel.
The principal works in air as well, it hinges on velocity and it is what gives an airplane wing it's lift in air.
The constriction being discussed does not increase the electro-acoustic efficiency or bass output however, although combined with the trapped air volume between the radiator and slot, can act as a low pass filter which could reduce the distortion the cone produces. The air noise Bill mentions is a real factor and turbulence in ports is also why the response of vented boxes can change once above low power.
Ah yes, real life observations of a non-linear world.
This is why I like horns vs. bass reflex. Among other benefits, Their higher efficiency allows them to work without creating thermal issues in the voice coils when kept at normal listening volumes in the home. Another non-linear behavior skirted.
"The principal works in air as well,"
Ummm, he just said that.
And, it's "principle".
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