I was auditioning for a band last night in a new unfamiliar room. I set up my cab (BE15L-D) on the wooden floor of the large room we were in and went to town. I had a new head to break in and really put the rig through its paces. Nothing too loud, just good overall volume and the tone was sweet. During certain songs I noticed a big dropout whenever I played a C, it was most obvious on the A string. I think I found a dead spot of the floor, or is it called the resonant frequency? Anyway, my C on the A string was practically non existant. It was like all the power was being sucked from that note. If I did not know my bass and my equipment I would have thought it was a dead spot on my bass, but no, it was definitely the floor or the room. I have experienced some rooms that emphasize certain notes and tend to bloom, but here it was very obvious something was absorbing the power of that frequency. Very weird. It did not matter whether I turned up or boosted that frequency, in fact it was counterproductive. I have a Gramma pad and of course I did not bring it and it *may* have helped - I'm not sure. The problem was that bad. So I just basically ignored it all night. My question is this. How do you guys deal with minimizing a dead note when on a gig and what are some of the things you do to mitigate them? I have played a lot of different gear and set ups in different clubs, yet still experience this from time to time. I would appreciate your input and discussion on the nature of this phenomenom. If only our bandmates knew what kind of crap we bass players contend with in our quest for that elusive tone. I guess that is one of the drawbacks of playing with our ears open.