|When I got the matched capsules from The Sound Room, http://www.oktava.com/, they provide frequency response curves with each one.
The video has the following mic position sounds
00:00 Near 12th Fret
00:55 Near the Saddle
01:52 Near the Tuning Head
03:23 Near the Sound Hole
05:00 Top of Guitar Body
06:26 Bottom of Guitar Body
I think the most listenable positions are 12th Fret, the Saddle, the Sound Hole.
The Tuning head is very scratchy. The sound at the top and bottom of the guitar body could be useful.