Martin strings are the acoustic string of choice for musicians around the world. Wound to exact specifications, you can depend on these strings for tone, brightness and clarity on a daily basis.
Generally the thicker the string the louder the acoustic guitar will be, however it will be harder to play as the strings will have more tension than the lighter gauge strings. Strings like the extra lights will be a bit quieter, more bright and easier to play as there won't be as much tension in the strings. If your doing drop tunings or open tunings thicker strings would probably be better to use as they have more tension when you tune the strings down.
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When should you change strings on an Acoustic Guitar?
Here are a couple of questions to answer:
1) Have you had the same strings on for over 2 months?
2) Are your strings rusty?
3) Are your strings rough?
4) Do your strings sound dull?
5) Had a string break recently?
6) Do your strings smell?
If you answered yes to any of the above, its probably time to replace your acoustic guitar strings.Because of moisture on your fingers and in the atmosphere, strings corrode and rust over time and their ability to vibrate diminishes. This not only causes the sound to dull but even worse, the feel of the strings becomes rough and will hurt or even damage your fingers.