[Elecraft] K3 dsp rev D hiss audio

[Juha - oh6os]

Hello,

I have now K3DSPUPGD (Rev D). A lot of good, but... there is one drawback. I
noticed more hiss on audio (Heil headphones) even AF gain off! I had Rev B
and that was very quiet. That hiss is very notable on CW with narrow filter.
It is fatique to listen white noise.

What experience you have? Is this feature of new LPF on  DSP board?

juha - oh6os
K3 sn 2100
k2 sn 4781
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