Tim's Site on Various Things

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namespace:horn_loading_is_all_about_reducing_exit_shock [2026/01/03 01:53] – timnamespace:horn_loading_is_all_about_reducing_exit_shock [2026/01/03 01:55] (current) – tim
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 So in summary, just getting pressure built up in front of the driver with a pipe long enough to maintain pressure down to 500 Hz doesn't really do much good if you just release it without a gradual transition to a larger opening. The opening has to be big enough to reduce the exit shock, and the transition has to be gradual enough to do the same.This is why horns have to have some length. The real target is the mouth size, and the length is whatever it takes to gradually get there. If exit shock is to be reduced it follows that some directionality will be added. The PT waveguide in this experiment is only half as long as the 1" diameter PVC pipe, but it supports the lower frequencies dramatically better. The difference in output level was extrememly obvious as soon as the signal sweep played.  So in summary, just getting pressure built up in front of the driver with a pipe long enough to maintain pressure down to 500 Hz doesn't really do much good if you just release it without a gradual transition to a larger opening. The opening has to be big enough to reduce the exit shock, and the transition has to be gradual enough to do the same.This is why horns have to have some length. The real target is the mouth size, and the length is whatever it takes to gradually get there. If exit shock is to be reduced it follows that some directionality will be added. The PT waveguide in this experiment is only half as long as the 1" diameter PVC pipe, but it supports the lower frequencies dramatically better. The difference in output level was extrememly obvious as soon as the signal sweep played. 
  
-A further observation from this is that any diffractive event is lossy. A highly diffractive event is highly lossy. So any time a driver is small compared to the wavelengths it is producing it MUST be very lossy. Even if the driver weighed next to nothing and the electrical efficiency was close to 100 percent, I doubt you'd get to 10 pecent actual efficiency at converting electrical power to sound power when the driver is significantly smaller than the wavelength it's trying to procude. Unless, of course, it is assisted with a horn or waveguide. +A further observation from this is that any diffractive event is lossy. Ron Sauro told me that, so I know it's true. I just didn't realize how incredibly lossy it can be. A highly diffractive event is highly lossy. So any time a driver is small compared to the wavelengths it is producing it MUST be very lossy. Even if the driver weighed next to nothing and the electrical efficiency was close to 100 percent, I doubt you'd get to 10 pecent actual efficiency at converting electrical power to sound power when the driver is significantly smaller than the wavelength it's trying to procude. Unless, of course, it is assisted with a horn or waveguide. 
  
  
namespace/horn_loading_is_all_about_reducing_exit_shock.txt · Last modified: by tim