"Arny Krueger" wrote in message
...
John Atkinson wrote:
I first would like him to clarify what spound pressure levels are
required for 6Hz to become audible.

No spound levels were involved.

I would have thought it obvious that I was referring to _sound_ pressure
levels.

The sound levels involved were not extreme in any way. I did most of
the listening with Sony 7506 headphones and FSI IEMs. The signal source
clips at about 1.5 volts RMS, which sets a reasonably low natural limit.

So, what sound pressure level was required for the 6Hz tone to become
audible? The Fletcher-Munson or Robinson-Dadson curves imply that 6Hz
is not audible at normal levels, yet you are saying different.

John Atkinson
Editor, Stereophile