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Standing Waves !! Subwoofer direction
Nousaine wrote:
to demonstrate standing waves?? That represents ONE reflector...!!! Sure but the string was terminated at both ends now wasn't it. This is acoustics Eddie. NO!! If you look hard you may fnd a physics book that has the string with a LOOP on it on the far end so it wont be attached...!! Most phyics books only show the attached example... But standing waves can occur either way and only a FEW books take it to this next step.... IF IT WAS STAIRS YOU WOULD HAVE FALLEN! I am sure I have one of the physics books with the open loop example, if you insist I can find it and help you out with the details you must have missed... When I was learing this stuff I was inquisitive enough about it I couldnt be taught with just the exapmples in just one book... I even made the instructors THINK! Dont you remember the OPEN ENDED TUBE?? No I don't. It was closed at both ends where I went to school. Otherwise the medium blowsl out of one end. You must have been absent on that day! If you dont want to broaden your horizons then I guess this arguement is MUTE..... I tried tohelp... On the contrary, a standing wave CAN exist with only one reflector... Please study on this matter a bit more Tom...!! The effect you were trying to "draw" isn't a standing wave phenomenon. It's an acoustic cancellation that occurs at 100-300 Hz or higher. NO!!!! It happens at 1/4 wavelength!!! Even if you wanna call it the ALLISON EFFECT you will find it happens AT 1/4 WAVELENGTH from the reflector! there is a cancelation at 1/4 wave length, there is a reinforcment at 1/2 wave and so on... The most common example is the famous tower speaker floor-bounce notch. It's an wave interference issue not a standing wave. STANDING WAVES ARE INTERFERANCE!!!! YOU MORON!!!!!!! Eddie Runner http://www.installer.com/tech/ |
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