I design Digital Audio devices (USB Audio Class 1/2). I also play guitar and have a degree in percussion. The KM184 is known as being one of the best mics for acoustic recording and I know why. This freaken mic picks up everything! For the first week or so you always have something to tweak about a setup and this one can be very hard to setup. But I put one just below the sound hole and one at the 12th fret and the mix can be dead on.
To really get the most out of this mic it is best to have a really good preamplifier with low noise phantom supply. When I tried this on a MBox 2 Mini the noise from the preamp/phantom really diminished the overall sound of the mic.
For live recordings I set up a pair into a Art Phantom supply (battery operated) and then into a modified (SSD replaced hard drive) Korg KR-1 and recorded in DSD mode. The results were very good.
Thanks
Gordon