I change my strings once every 5 months or so on my acoustic (I wipe them down after every play) and i always return to ej16s. Somehow they fit my guitar the best. Although its more down to personal preference, i certainty recommend these strings as high quality and excellent tone.
I really like the tone of the D'Addario Acoustic strings. This strings feel very well and have a brilliant, defined sound. The basses are very tight, so they fit very well to guitars which already have strong, dominant basses.
But unfortunately they don't last very long... they lose their sound very quick, even though they are made from bronze and phosphor. And: If you play them for an hour or two, your finger tips get green - seriously. So even though the sound is great, it isn't the best choice you could make.
I would rather recommend Elixir Nanowebs - they sound as good as the D'Addarios, but they last far longer, so they are in addition even cheaper! Another good alternative are the D'Addario EJ series made of 80/20 bronze for a deeper, warmer tone.
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