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Re: the on-axis hole

Bonjour Jean-Michel,

It is my understanding that the on-axis hole is an artifact of a virtually inevitable mouth reflection. It would take an infinite radius "lip" at the mouth to totally eliminate it. A larger radius "lip" does produce a measurably smaller on-axis hole.

The measurements I linked to are with the HOM[higher order mode]-absorbing refractive foam insert in place. The on-axis dip isn't a HOM artifact, so design features that address HOMs have no effect on it.

The Summa is designed to be listened to somewhat off-axis, which has other benefits aside from smoother first-arrival sound - but that's another story.

A la prochaine,

Duke


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