On 5/5/2020 8:33 AM, Jim Thomson wrote:
Nonsense. Rolling off everything below 500hz is fubar. It will
...and does, sound like a tin can. Ditto with rolling everything off
below 400 hz. A gradual roll off below say 350 hz.... followed
by a pronounced, steeper roll off below 300 hz works good.
As does a steep roll off below 300-325 hz. But the rest of the
pass band has to be very carefully equalized. This is where
multi band, digital parametric EQ shines.
Jim,
I was elected a Fellow of the Audio Engineering Society, and am retired
from broadcasting and pro audio. For my last 25 working years, I made my
living designing large and small sound systems for both acoustic music
and speech intelligibility in difficult acoustic spaces. Before that, I
also sold and studied very sophisticated broadcast audio processing
systems. An example of my published work is here.
http://k9yc.com/AESPaper-TDS.pdf
Your recommendations are fine for YOUR ESSB ragchewing operation at
higher power than US stations are permitted, but it's lousy advice for
speech intelligibility under weak signal conditions, for the reasons
noted. My advice is for the latter.
IMO, if you need a parametric as opposed to octave-band EQ, there's
something seriously wrong in your system. Maybe a poor choice of
microphone, or a noisy shack.
73, Jim K9YC
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