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The weird thing was I could hear the drumming, but not the spit on my last turkey encounter.
Here is a post from Mike Battey from some years back. He mentions the difficulty for humans in locating sounds below 80 Hz and specifically turkey drumming. His advice is to listen for the spit before the drumming.http://oldgobbler.com/Forum/index.php/topic,20787.msg230173.html#msg230173