New WAMM

[Jean-Marie]

It's important that the signal from all drivers arrive at your ear arrive at the same time! This got nothing to do with the phase of the recordings!

Why?

What, other than phase through the crossover, is effected by time alignment of the drivers?
In the Goldmund the tweeter and bass unit of the main speaker are offset by the difference at the speed of sound in air at the crossover frequency.
This is probably sensiblish, but since the 2 units share output over a reasonable frequency range it would be "wrong" for most of the overlap (if it mattered).
The main unit is adjustable on the bass box by a huge amount but probably pointless since at the crossover frequency the wavelength is huge, and adjustment could only have a negligible effect.

I'm not saying that time alignment matters or not, but if it does, I don't think that the speed of sound matters nor the wavelength..
If we agree that the wide-band point source would be the theoretical ideal, then the corrections between drivers only needs to compensate the fact that the center of emissions of the various drivers is not at the same distance from their mouth and therefore compensation never need to be much more than the difference of depth of the drivers....
That also explains the arc form of the WAMM as well as the Grande Utopia for instance, trying to have the emission center of all the drivers at the same distance from the ear.

Jean-Marie