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Technical and scientific discussion of amps, cables and other topics.

RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz!

OK, Pop*-? I vote Squirt in bottles and Nehi Grape soda

How a Helmholtz resonator can work to subdue a room mode is easy to explain / envision.
A standing wave dictates the pressure maximum is at the boundary which acts something like a mirror or better, what concrete represents when a super ball hits it.

IF one measured the pressure in the corner, you would see at the condition that you have a standing wave, you have a peak in the pressure in the corner. The down side is there are also Nulls produced where the bass is gone. IF you drilled a hole in the corner to the outside world, that would reduce the pressure at resonance and reduce the sharpness and magnitude of the standing wave .

That "hole" will let bugs in so instead, one makes a Helmholtz resonator (a volume of air in a container and Vent or duct to the room, like a vented box woofer with no woofer). This has the same resonant F as the room mode and so, at that frequency is "like" a duct to the outside in that at least at that one frequency, the air in the port is VERY easy to move like a duct to the outside and not ridged like a wall pressure boundary.

This is all i can offer


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