If you're trying to find that "perfect spot" on your guitar, mandolin, banjo, whatever, don't forget that wonderful invention VELCRO! Get the stuff with adhesive on one side..cut a tiny piece off, stick it on your mike, and start hunting for that spot inside your guitar where it all comes together. It took me about 4 hours of sticking and unsticking to find it for all of my instruments. I did my testing at the local folk club after hours, by bribing the sound guy to hang around with beers and anecdotes from 25 years on the road.