Crossing Left and Right Speakers

They specifically said, Pre left to Right Amp.

Well then that's weird. :D

@mihorn

While the diagram you provide is true, I don’t know of any theory of speaker dispersion that matches your description.

I suggest you take a look at ANY midrange or woofer spec sheet and examine the of-center frequency response, as well as any of the lateral dispersion charts from Stereophile.

In all these cases the overwhelming issue is the diameter of the cone relative to the wavelength, and the shape of the driver, be it cone, dome, or even flat doesn’t play a big role.

I think this was probably meant differently.

They probably meant to refer to toe-in, or, how much the speakers are angled relative to the rear wall. With the speakers flat to the wall behind them the tweeter axes (plural of axis, say axe - ease) are parallel, but as we angle the speakers in (more toe-in) the tweeter axes cross, either behind or in front of the listener.

Extreme toe-in where the axes cross in front of the listener, can help when speakers are placed very close to side walls.

Changing toe-in can affect the imaging and leave you in one of these situations:

• You hear a L and R but no center
• You hear a L and R and center but the space between seems hollow
• You have a clear image from speaker to speaker with no gaps

By the way, most listeners use too much toe-in. Many speakers sound better with no to modest toe-in instead of being pointed directly at your ears.