"William Sommerwerck"

This is a common source of confusion. "Same direction" means "outward or
inward", /not/ same direction viewed from overhead. The same signal should
produce compression or rarefaction from all speakers.


** Correct.

Phasing similar speakers is all about making the low frequency output from
each *reinforce* the others rather than cancel.

Compared to the wavelengths of low frequency sound, woofers are a point (
hence omnidirectional ) source of sound pressure - so it is irrelevant
which way the cone faces.

Ideally, a listener should be seated at the same distance from each speaker
so all time ( of arrival ) delays are identical and do NOT create phase
changes.


.... Phil