@kdude66
From about 4 to 15 KHz in the case of the tweeter. 4Khz is about 3 inches and 15KHz is about 1 inch in wavelength.
As an example imagine two tweeters spaced 6 inches apart. The combined reflected energy they give out will produce total cancellation at roughly 4KHZ, a reinforcement peak at 8Khz and a cancellation at 12Khz etc. The combined sound directly in front and equidistant from both tweeters will be the only signal in the room without these effects (the direct sound)
Generally what you hear is roughly 60% direct and 40% reflected if you sit in a farfield position and maybe 75% direct and 25% reflected in a nearfield situation.
Here is a plot showing the effect of 1 msec delay - equivalent to about 12 inch spacing of the drivers that produce the same signal.
http://digitalsoundandmusic.schwartzsound.com/wp-content/uploads/2014/05/Figure-4.32-Comb-filtering-...
Basically comb filtering changes the timbre of the sound (often described as a thinner or hollow sound) as well as creating a wider Soundstage.
From about 4 to 15 KHz in the case of the tweeter. 4Khz is about 3 inches and 15KHz is about 1 inch in wavelength.
As an example imagine two tweeters spaced 6 inches apart. The combined reflected energy they give out will produce total cancellation at roughly 4KHZ, a reinforcement peak at 8Khz and a cancellation at 12Khz etc. The combined sound directly in front and equidistant from both tweeters will be the only signal in the room without these effects (the direct sound)
Generally what you hear is roughly 60% direct and 40% reflected if you sit in a farfield position and maybe 75% direct and 25% reflected in a nearfield situation.
Here is a plot showing the effect of 1 msec delay - equivalent to about 12 inch spacing of the drivers that produce the same signal.
http://digitalsoundandmusic.schwartzsound.com/wp-content/uploads/2014/05/Figure-4.32-Comb-filtering-...
Basically comb filtering changes the timbre of the sound (often described as a thinner or hollow sound) as well as creating a wider Soundstage.