In Reply to: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! posted by geoffkait on February 26, 2023 at 12:18:49:
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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Follow Ups
- RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! - tomservo 06:42:54 02/28/23 (7)
- RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! - geoffkait 08:12:56 02/28/23 (6)
- RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! - tomservo 14:22:26 02/28/23 (5)
- RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! - geoffkait 15:10:44 02/28/23 (4)
- RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! - tomservo 15:57:16 02/28/23 (3)
- RE: Aren't we getting a little tiny bit off topic here? Hey, it's time for a Pop Quiz! - geoffkait 16:36:17 02/28/23 (2)
- you remain out of your league, Geoff... how about... - Cleantimestream 08:29:59 03/12/23 (1)
- Blah, blah, blah. Did you just wake up from a 6 day slog? Nt - geoffkait 10:27:04 03/12/23 (0)