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[tkroeker]

So one piece I'm missing is this.
when two speakers couple, is it at Hz above or below the 1/2 wavelength?

i.e. ( roughly)
two 18's
80 Hz = 14 feet
1/2 wavelength = 7 feet

if the two 18's are under 7 feet apart will they couple 80 to 500,, or 80 down 

[Mac Kerr]

So one piece I'm missing is this.
when two speakers couple, is it at Hz above or below the 1/2 wavelength?

i.e. ( roughly)
two 18's
80 Hz = 14 feet
1/2 wavelength = 7 feet

if the two 18's are under 7 feet apart will they couple 80 to 500,, or 80 down

They stop canceling and begin to couple at frequencies whose 1/4 wavelength is larger than the driver spacing. You get summation over a 1/2 wavelength range, but it is plus/minus 1/4 wave around zero phase offset. Since there is no minus offset involved in driver spacing it is only 1/4 wavelength, a 1/4 wavelength being 90º of phase offset.

Mac

[Ivan Beaver]

if the two 18's are under 7 feet apart will they couple 80 to 500,, or 80 down

They couple as the freq goes LOWER. 

The spacing is the UPPER limit.

Because as the freq goes lower, the wavelengths get longer, so they get "acoustically closer" as the freq goes down.

[tkroeker]

They couple as the freq goes LOWER. 

The spacing is the UPPER limit.

Because as the freq goes lower, the wavelengths get longer, so they get "acoustically closer" as the freq goes down.

awesome thanks

[ProSoundWeb Community]