|3rd January 2007, 12:52 AM||#41|
Wizard of Kelts
diyAudio Moderator Emeritus
Re: Crossovers and response deviations
However, I am afraid that you have gone off-track here, from my understanding of your post. What you have seen to have proven is that if two different frequencies are being played, there has to be a much, much greater difference than 12 dB for one frequency to drown out the other.
I agree with this completely. If a mere 12 dB was enough for one frequency to drown out a different frequency, then there would be no use for music sources with a dynamic range greater than 12 db, let alone 60 dB, (phono) or 100 dB (CD). I think we all can agree that we do indeed need music sources with a dynamic range greater than 12 dB-or even 30 dB.
However, we are dealing with the question of not the decibel difference where one frequency drowns out a different frequency, but what decibel difference is required for one source to drown out a second adjacent source playing the same frequency.
Both the woofer and the tweeter are playing the same frequency, or combination of frequencies, throughout the crossover region. It is just at various points throughout the crossover region, each are playing them at different decibel levels from the other, (except at the crossover frequency, when both are playing equally). For this reason, I fail to see why the point where one frequency is at such a decibel level that it drowns out a different frequency is relevant to this crossover issue. What is relevant is the decibel difference where one source drowns out a second adjacent source playing the same frequency.
For that purpose, I would propose using the decibel difference where one cannot tell when the softer source is switched on or off.
"A friend will help you move. A really good friend will help you move a body."
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