Hey Captain. Like i said. Its usually a ribbon, (dx-77s, R-84s, Coles 4038s) but some times dynamics (57's, AKG D12s, 421s)
I reckon I've seen it on most microphones.
In most instances I end up with the microphone somewhere between 2.5 and 3.5 feet from the bell of the horn and tilted slightly of axis from looking straight down the barrel of the gun so to speak.
Preamps usualy Neve 81 series at one studio or 1064s.at another. Or I might use the AEA ribbon pre (TRP) for super clean tracks.
It doesn't seem to make a difference. I'm almost convinced its got something to do with the acoustic property's of the wave front of brass instruments.
I must stress that I'm not convinced its really a big problem. The horns sound good and i don't think its putting enough off-set in my mixes to hurt peoples speakers or anything. I still seem to be getting enough dynamic range to give the horns a good squeeze with a compressor.
I just find it odd. No other sounds do this. Ive thought about the fact that maybe at the beginning of a horn note there is a single loud burst of pressure that forces the ribbon of diaphragm into a wild swing before it starts to vibrate and produce a note. but then i thought you'd only every really see that for a moment. The DC off set i see is sustained all the way to the end of the note.
So i feel forced to to feel that there is some really weird spooky property about horns that can consistently hold a suspended vibrating element in compression and establish its own 0 line on top of this.
What else does that?