The DPA VO-4099G, made in Denmark.
It's a professional-level minature condenser shotgun supercardioid that clips on to your guitar.
I reinforce the clip with a bit of gaffer tape.
It sounds
exactly like the acoustic guitar.
Exactly.
Pricey @ $619, and you have to plug into something that supplies +48v phantom power.
Best guitar pick up I know of, it is widely used in high-end classical venues that can afford any gear they want.
With other $35 clips it attaches it to a zillion other instruments.
Truly studio quality ... which saves money when it's time to buy a fine mic for recording.
Takes 10 seconds to move it to your other guitars.
Got 4 guitars? buy 1 PU instead of 4 ... also saves money.
EQ and suppress feedback by simply changing its angle or position on the tiny gooseneck. No need to reach down to a pedal to turn knobs.
https://www.sweetwater.com/store/det...iABEgJRsPD_BwE
If you insist on something permanently installed into your guitar (can't imagine why) I like my LR Baggs Lyric which I bought before I found out about the DPA.
It has none of that hideous piezo quack because it is also a condenser mic that gets glued to the bridge plate.
Very natural sound, and the phantom power comes from a 9v battery.
Only $199.
The DPA is over 3 times the price but IMO way worth the investment.
I use it everywhere, even for busking.
You get the sonic benefit of a high-end studio mic on a stand without being handcuffed to a mic stand.