Wgallupe writes
>Toe in will increase treble response at the listening position. Parallel to front wall will calm the treble a little. Also, try swapping speakers left to right so you can compare sound with tweeters "outside" vs "inside".
Toeing the speakers in past the listener will reduce both on-axis treble and higher frequency energy going into the side-wall reflections. "dipoles" with low enough frequencies they act as acoustic dipoles see reduced side and front-wall first reflections in that part of the spectrum too.
FWIW, an acoustic dipole has response -3dB compared to the direct sound at 45 degrees off-axis, -6dB at 60 degrees, and -12dB at 75 degrees. Additional toe-in moves the side-wall first reflection farther into the null on the outside of the speaker and front-wall first reflection farther into the inside null.
>Toe in will increase treble response at the listening position. Parallel to front wall will calm the treble a little. Also, try swapping speakers left to right so you can compare sound with tweeters "outside" vs "inside".
Toeing the speakers in past the listener will reduce both on-axis treble and higher frequency energy going into the side-wall reflections. "dipoles" with low enough frequencies they act as acoustic dipoles see reduced side and front-wall first reflections in that part of the spectrum too.
FWIW, an acoustic dipole has response -3dB compared to the direct sound at 45 degrees off-axis, -6dB at 60 degrees, and -12dB at 75 degrees. Additional toe-in moves the side-wall first reflection farther into the null on the outside of the speaker and front-wall first reflection farther into the inside null.