Hi All,
In a reply to an earlier email Dan Dugan mentioned the Feltcher-
Munson loudness curve as an explanation as to why we are aware of
more low frequency energy in recordings than which is apparent to the
"naked" ear.
I made some quick experiments at constructing an inverse differential
FM curve last night based on a chart of FM curves. I've tried to base
the EQ on the change of emphasis that results from a 60dB boost in
volume. The results appear to be quite promising and seem to sound
closer to how I perceived the environment when listening at normal
levels. There is a significant amount of LF cut, however this is a
gradual roll off to approximately -23db at 20hz rather than a steep
filter applied at 100hz as I've used in the past. The amount of eq
required still needs some work, but I thought I'd share the results
of my first experiments anyway...
http://www.mactrix.com.au/files/recordings/EQTest.mp3
cheers
Paul
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