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Thinking about purchasing a condenser mic for bluegrass/acoustic

I'm interested, as well, and for a good reason. I was doing sound for our band on a porto-trailer-type stage and was asked to do the same for a bluegrass band. They showed up with two cond. mics which worked but were hard-as-hell to tame in the feedback dept. I owe this in part to my inexperience with said mics and the dismal acoustic properties of the stage itself...it was pretty much a dumpster with a sunporch. The mics themselves were so sensitive that I was picking up the compressor on the beer truck some 30 yards away.

Riis
 
I'm interested, as well, and for a good reason. I was doing sound for our band on a porto-trailer-type stage and was asked to do the same for a bluegrass band. They showed up with two cond. mics which worked but were hard-as-hell to tame in the feedback dept. I owe this in part to my inexperience with said mics and the dismal acoustic properties of the stage itself...it was pretty much a dumpster with a sunporch. The mics themselves were so sensitive that I was picking up the compressor on the beer truck some 30 yards away.

Riis
Condenser mics have a lower threshold, i.e., they need less SPL to start producing a signal than do dynamic mics (hence your experience with the beer truck). This makes them more prone to feedback and limits how loud you can make the reinforcement. Couple that with the need to turn up to pick up a musician who is standing a few feet away rather than "eating the mic" as vocalists frequently do with dynamic mics, and you can have a challenge to deal with, especially in a live room. Be sure and place the mic as far behind the FOH speakers as is practical. You will be somewhat limited in what you can do with EQ because the freqs that ring tend also to be the ones you want to hear from the mic. There will probably be a volume ceiling that you cannot exceed without feedback.

Good luck.
 
A number of years ago I saw Bela Fleck at an outdoor venue... Villa Montalvo, in California. They were using AKGs and Shure KSM32s all over the place... The KSM32 is a cardiod single pattern.

I've used it in live situations for vocals, acoustic instruments, horns and overheads with great results.

I would guess the ATs would do great too.

Cheers!
 
Condenser mics have a lower threshold, i.e., they need less SPL to start producing a signal than do dynamic mics (hence your experience with the beer truck). This makes them more prone to feedback and limits how loud you can make the reinforcement.

Condenser mics tend to have much wider pickup patterns than typical dynamic mics. This is what makes feedback more of a problem, not their wider dynamic range.