This is to ask that I have a classical guitar Yamaha C70. Whenever I play the A note on any of the frets the 5 string I.e. the A string starts to resonate and it's quite irritating. It takes around 7-8 seconds to calm down. This happens only with the A string, not any other string. The buzzing sound was mild earlier but after changing the A string to ProArte normal tension,the buzzing sound has increased considerably. Can anyone please help me find an answer ?
If the problem is a buzzing resonance of the open A string when you play any A, the first thing to check is your nut. Has the string slot worn down letting the string sit too low. The other options are the height of the saddle, and then the truss rod tension (if your guitar has one - some classicals do, most don't)
Strings should resonate when a matching note is played, but the buzzing tells you your clearance is too low.