W2ihy sells an equaliser that i often hear mentioned in dxland called eqplus. Its really dear though.
Apples and oranges.
If we only had the bandwidth and radios were designed for this kind of mic. Go with the D-104. No eq needed. It was designed as a communications microphone. I had studio mics and racks of gear until I saw the light.
READ THIS!!! ESSB HiFi SSB transmitter bandwidth splatter
Yup.His audio is not even mid-fi,he is just using a mixer to inject audio to the front mic connector