Re: 2 source interference - setup

[John Denker <jsd@MONMOUTH.COM>]

At 01:31 PM 4/10/00 -0400, GARY HEMMINGER wrote:

> Using a wavelength somewhere around a meter we set up our
> speakers about five lambdas apart and facing across the field.

Did you check the directionality of the speakers?
Did you check the directionality of the microphone?
Did you measure |A| and |B| and |A+B| separately, or just |A+B|?
Did you account for the wind?
Did you measure the variation of |A| with height?
Did you measure the THD (total harmonic distortion) of your generator / amp
/ speakers / mike / analyzer?
Did you clap your hands to get an estimate of the echo intensity from
obstructions in all directions (including behind the speakers)?

> > I doubt that crossovers are a factor.
>
> There seem to be differing opinions here - I'd be interested to hear
> more.

The laws of physics are not usually considered matters of
opinion.  Collecting more opinions is unlikely to settle the issue.

Can you pose a more specific question?

Do you think crossovers are a factor?  If so, can you state a hypothesis as
to why Floquet's theorem (as previously discussed) does not apply?

Have you considered the competing explanations for the lack of an
easily-observable interference pattern?  Can you rule them out?