Couple of things
- With a mic I have to go for a condenser mic, not a dynamic mic (I really dislike the sound of a dynamic mic inside a body). Condenser mics need power, so I need to build in a circuit + power.......... and if I wanna do that elsewhere I need to add a different output.
- Mic is bit more open to feedback and such; don't want too much feedback.
- Piezo is easily installed and (with a stereo jack) easily fed outside the body for the preamp
Dunno; maybe I never use it Just curious if there is something more. Double bass users use em all the time
You could use a mike that requires phantom power if you have an intermediate box that provides it - I believe the ART Tube MP will provide phantom power via an XLR cable. Finding the right mic to go inside the body is another matter, and making sure it has a small enough cable to go inside the body.
OTOH, I've used electrets for many audio applications as a radio and TV producer, and I have no problem with them. Just put in a fresh battery and have fun.
I think I'd be tempted to try a piezo that could be fastened inside the body with adhesive, and remove a pickup long enough to get access to the body interior and mount the piezo, then re-install the regular pickup. Not sure how I'd get the mic lead out of the body...I'd probably bring it out an F-hole during experimentation, and when i was satisfied with the sound, add another jack on the body OR (here's an off-the-top-of-the-head thought) see if I could replace the mono jack with a stereo one and use the second connector on the stereo jack for the second pickup. Seems like that would require both pickups to have a common ground, though.