[GregS]

In article , (GregS) wrote:
In article , Stephen
McLuckie wrote:
Matt Ion wrote:
Well, Nick, I hate to nit-pick, but you're talking about a phenomenon
known as "boundary reinforcement". You'll actually get MORE chance of
cancellation the closer you move a sub to a wall or corner, because
the reflected out-of-phase waves are that much stronger... but so are
the IN-phase waves.

There's a good article on it he
http://www.stereophile.com/features/706deep/index1.html

Have you read this article? For example:

"At low frequencies, the phase difference between these sources becomes
negligible because of the long wavelength, so their outputs combine
constructively. One boundary thereby adds 6dB to the sound-pressure
level, two boundaries add 12dB, and three boundaries add 18dB, assuming
that they reflect perfectly and that the loudspeaker's radiation is
omnidirectional (which at low frequencies is usually the case)." And....

Sounds like somebody added incorrectly. If you add one boundry, it would be 6
dB.
3 Boundries would be 12 dB.

It would be really hard or mpossible to cerate more than on boundry, since only
half the output is really being reflected. Getting more than 10 dB in any scenereo
is very difficult, unless its resonance.

greg