[sdiy] Crazy idea to improve transient response?

[Glen]

I have an idea for improving transient response of a few things. For
example, let's say you have a condenser mic with excellent transient
response, but a very poor S/N ratio. At the same time, you have a dynamic
mic with poor transient response, but a *much* better S/N ratio than the
condenser mic. Why not use both mics, and let a circuit rapidly crossfade
from the dynamic signal to the condenser signal on loud signals (ie,
transients) only? (This assumes that both mics are placed in perfect
physical alignment, and offer the same phase response to your incoming
signal of interest.) I'm thinking of something that would operate very
quickly and "crossfade" in and back out again--even on a single waveform
peak, if that peak exceeded a certain threshold.

I think a similar thing could be done to partially offset the transient
response errors in compander circuits, due to the sluggish nature of the
compressers and expanders. For the larger waveform peaks, it might be
possible to bypass the compander entirely, and only use it for the weaker
signal levels, where it's most needed.

Any comments?

later,
Glen