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Slightly off topic here, but I still prefer 421s on horns (and sax unless there are RE20s available) as I do live sound all the time. In studio, yes ribbons are good...

<L>
Lou Judson
Intuitive Audio
415-883-2689

On Sep 30, 2014, at 8:16 AM, Jamie Howarth wrote:

> Brass waveforms are asymmetrical... The air pressure emanating from the annular mouthpiece is pretty much a broadly shaped needle pulse... The lips buzz against the mouthpiece which modulates an exhaled breath - there's not much negative excursion.
> Any part of the system that acts non-linearly in the presence of that offset will go nuts. 
> I believe (haven't proved) that since the signature sound of condenser mics is strongly tied to their resonance/time-freq behavior coupled with the asymmetrical pull of the backplate on the diaphragm may be make them resonate more intensely when excited by an offset signal like horns. Whereas ribbons are more symmetrically damped with a lower freq resonance point. Hence the preference for 44s and 77s (and Beyer M130s in my personal preference ).