On Fri, 31 Dec 2004 08:32:11 -0600, "Rex B"
vaguely proposed a theory
.......and in reply I say!:

remove ns from my header address to reply via email

Something about "dB". the reading is meaningless (and often
misleading) if a measuring distance is not also given. The _standard_
as I know it is one foot, maybe one yard and in our mteric world, one
metre. Because sound pressure (SPL) drops off so fast with distance,
unless the unit is _very_ good at directing it as described in this
thread, "120 dB" at 1 foot could be 100 dB or less at 1 yard, without
doing any math (it is NYD). So they tell you it's 120dB but forget to
mention they had the sensor stuffed in the unit's throat.

As I said before, even at 10' the dog will be getting a very small
proportion of the available sound. It also sounds like it has a real,
ingrained problem.

You could try the spotlight reflector or antenna dish ideas. They
would make a huge difference.

As for the sound level, the Bark Stopper unit I bought supposedly puts out
120 db. Doesn't seem to phase this hound, at a range of ~10-ft.