We've been hearing a lot of positive reports about the Hypercardioid 3 Zigma Mics on Upright.
(Finding the sweet spot between the bridge and f-hole helps).
Our Nashville beta-testers All said this was a great upright mic!
A lot of mics will work on upright, but the super-low-noise and very smooth
response curve of the SD-H seems to resonate with acoustic bass players!
3 Zigma Audio www.hybridmic.com