This is the casing for the 5 channel Audio mixer I'm currently working on, got the board back from the manufacturer, so can crack on with it, the design of the mixer will work nicely with the Heil Microphones this casing has got plenty of RF shielding, plus there will be a fare few ferrite beads involved, and a couple of audio isolation transformers,which I'm waiting on from America.
Straight after this will be a Equaliser, which I have in mind about 16 channels. This is my favourite side of Amateur Radio ,AM type Audio on SSB, which I think is also called HiFi SSB audio.