This mic is a better vocal, narrator or radio microphone than an acoustic guitar microphone.
I placed the mic 6in away from the base of an acoustic guitar and recorded a performance in an isolated studio. The AT2020's lack of warmth showed problems when trying to record an acoustic guitar. The mic showed a slight bump in amplitude at about 9kHz, which helped project the voice. The sibilance was not harsh but rather smooth. I was impressed with its performance when recording a sibilant-sounding source. The mic handled the proximity effect of low frequencies well - even when the narrator popped his Ps.
