Recording Acoustic Guitars is easy, all you have to do is plug a microphone into a recorder, place the microphone in front of the acoustic guitar, press recorder and start playing.
Its that easy and you might get a good recording but, there are things you can do to get better recordings.
Just by changing the position of the microphone in relation to the guitar will have an affect on the way the acoustic guitar recording will sound.
And, by using a different type of microphone will affect the sound of the guitar recording.
Here are a few things you can try, but, just remember, one way isn't necessarily better than another, you will just get a different result. So it's important to experiment until you get the sound that you like.
One important thing is your guitar needs to be in tune so it's best to use a guitar tuner to keep it in tune.
Try using different Microphone Types
Try using different Microphone patterns
You can also try using Stereo Microphones
The Room Acoustics will affect the recording
One more consideration is, when you are recording acoustic guitars should you record the signal wet or dry?
Just remember if you record the acoustic guitar wet, with a compressor, EQ or reverb you can't remove the effect after it is recorded. But, having said that, a little compression when recording can add something to the recording if you are recording a guitar that needs a bit of punch or drive to it.
One last thing.
Use new strings that have settled in for about a day. New strings tend to go out of tune very quick and could be out of tune by the time you have recorded the perfect four minuet recording. Also, new strings sound more alive and have better sustain