Acoustic guitar looping and feedback problems

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I've been pl`ying out with `n `mplified `coustic recently, `nd I'm running
into feedb`ck problems once I get ` loop built up.  I've tried eq, ph`se
revers`l `nd ch`nging my spe`ker pl`cement, but it's still ` problem.
Anyone h`ve `ny experience with the S`bine or Beringer feedb`ck
extermin`tors, or h`ve `ny other suggestions?TH