[Elecraft] K3 DIY DSP Rev D - please elaborate

[David Lankshear]

By firmware release notes, do you mean the comments associated with the order for the K3DSPUPGD, Don?  If that's a yes, then this should settle matters because it says:

"Improves low freq RX/TX audio response below 300 Hz, and adds a Low Pass Filter (LPF) that rolls off RX audio above 4 kHz."

Thanks for your guidance on this, Don.  A Happy New Year to you and to all on the reflector.

73  DaveL  G3TJP