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Mostly right

Duke

Nice job, mostly right.

The very early or what Blauert calls "summing localization" probably peaks at about .68 ms but its effect extends to about 2-3 ms and is completely gone by 4-5 ms.

I would then say that the detrimental reflections are failry constant from about 5 ms. to 10-20 ms. and fall in importance steadily to about 40-50 ms. after that they are clearly advantageous.

Vertical reflections can often be worse for coloration than lateral ones, but its lateral ones that affect imaging. In Blauert the term used is "localization blur" to indicate things that make our localization cues indistinct. Audiophiles call this imaging.

You also failed to not that if the speakers are not CD then you must be on-axis for a flat spectrum and the speakers cannot be toed-in to reduce side wall reflections. This is a disticnt advantage in addition to the proportional dircet and reverberant energy.

Another way to evalute direct and reverberant energy is to have someone stand between you and the loudspeaker - about 1/2 way - what you hear is the reverberant field. It will not be insignificant and in fact in a good speaker one will hardly notice the presence of the "masking" person, except that there is "localization blur" because the direct field is gone. The importance of the reverberant field is highly room dependent and the room plays a major role, along with the speaker design, in image formation. One can almost never get this correct without attention to both factors. The loudspeaker alone can not do it.

But good job overall.

Earl Geddes

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