I am trying to record my Martin D28 through a Mackie 1604 VLZ mixer into an M-Audio Delta 44 PC interface and onto Sonar X1. Until now (Midi and other audio sources) I have had ZERO problems. That is, until I tried recording an acoustic song that I've been working on. My low "C" on my guitar (Finger picking) fills the mix with a "BONG" sound. It's the worst acoustic rumble I've ever heard! I tried just EQ'ing it out but to do so takes so much EQ that it buries the acoustic track making my beautiful D28 sound like a Ukelele. I've tried everything imaginable by means of Mic placement and techniques. I've done HOURS of research on the net but STILL!!! My low "C" on my Martin seems to be it's resonate frequency. I've tried different mics (Dynamic, condenser, MXL 990 to Rode NT-1a) Both single and double micing, I've tried different room configurations (Damper panels, reflectors, etc.) every mic placement and arrangement that I can dream up, anything I can think of; yet when I hit my low "C" (Finger picking) I get a frequency hogging, muddy, gong-sounding, blaring, BONG! I've tried near micing, far micing, off axis micing, dual micing, micing up and down the neck, micing the nut, micing the saddle, small condenser, large condenser... etc. WHEW! AHHHHHHHHH!!!! The frustration is raising my blood pressure!!!!! Please help!! At this point, NO TIP WOULD BE DISMISSED! Is there a technique that I could try? Am I just going to have to smother the acoustic track with EQ? I am open to ANY suggestions or ideas.