I bought some months ago a slightly used Acoustic Fender. I tested it with amplification a couple of times and only noticed a very loud response when palm-hitting the bridge, for rythmic purposes. I didnt care much at the time. Yesterday I performed live for the first time and I noticed a couple of things. First of all I played right next to the speaker box, and I know that may have been the reason, just checking. 1. I had this growing humming sound with the volume on, just touching the D string went away. 2. (most concerning) Playing open D string played the note with a growing reverberating sound almost like a feedback. rendered useless playing that note.
My questions are (of course without testing it not close to the speaker) if those problems are only related to sympathetic humming or if there could actually be a problem in the electronics specifically with that string. And if so, what simple solution could I apply. I live in a country where I cannot count on taking it to any repair shop and even a economic, used acoustic like this costed like halaf a year salary, so a repairment is necessary, jaja.