Passive Amplifying Effect for Speakers

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korneld

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Joined 2013
#1
The other day, I took my cheap and properly crappy speakers of my PC and placed them face down on my desk. They sounded louder and better. If I lifted them up just a bit off the surface, they sounded even better. I do own a decibel meter and I did some testing. The speakers are somewhat louder, but only by a few decibels. But the perceived volume is so much grater.

Could someone walk me through why this is? I'd be very interested in the physics behind the phenomena.

Thanks.
 
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#3
Well, you could read up on how horns (all horns) work, because that sort of thing would cause the same sorts of changes in directivity and acoustic coupling with the air in the room that horns cause. I'm not saying you've created an effective horn, just that the same stuff is going on. You'd also probably have a resonant cavity between speaker and table ringing across some frequency range (which would make them sound louder in that range), and changes to the Fb & Q of the cabinet alignment, if the cabinets for these speakers are functional.
 
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