I have a cedar dreadnought Takamine ETN10c, with a very worn top. It has recently started feeding back more than it has done historically, and it seems to be the same frequency each time. I could just be unlucky with PA/monitor, but this weekend I got the chance to compare directly with my Larivee, which was totally fine.
If I crank the volume through an amp and tap the body, the tap seems to be between E and F, which correlates with the feedback I am getting. I am wondering whether the damage to the top has just degraded/changed the resonant character somehow?
Signal chain: Tak preamp > Keeley Compressor > TU3 > Radial passive DI > desk
Would I be better off with a nice soundhole pickup? Some kind of feedback-killing preamp? Rubber bung in the soundhole? Retire the guitar?
The guitar also needs attention to the frets and saddle, so I am wondering when I will be throwing good money after bad...