>50 Hz and 100 Hz octave bands are VERY important -- they allow 
equalization to correct for proximity effect in directional 
microphones, and to reduce the effects of breath pop. 

Jim (K9YC), what part of the 50 Hz spectrum will get by a 2.7 KHz roofing
filter at any equalization setting? At least on my system I could put 50 Hz
at +16 dB gain and 50 Hz will still be down 20 dB. The DSP skirts put it
lower. I ask this question because I have been staring at my actual roofing
filter plots.

So I don't quite understand where you are coming from. Perhaps the devil is
in the details and breath-pop energy which would be cut off by the roofing
filter/DSP combination is still affecting the transmit-audio gain in
deleterious ways. Maybe it is just my lack of understanding of how the K3
works. In this area it is a bit of a black box to me, the price we pay for
not soldering.


Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1  #1311


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