I appreciate the note, thanks.
As a general comment, when people change our settings or systems and we're unaware we can deliver demos that terribly misrepresent our products, which we always demo without EQ, etc. When a system has been in a bad state and we're unaware, we don't know how many people got a flat out horrible demo instead of a nice experience. With the time and expense of a show having systems in an incorrect state can wreck impressions, and sometimes damage our hardware. In one other show, someone destroyed two Hugos by plugging them into an incorrect power source, thinking they were being helpful. We also had EQ done twice to our systems again in ways that messed up demos for unknown numbers of listeners, and since multiple amps are connected to one source on most of our systems a settings change can affect more than one system at a time, making the problem worse.
So as a general note for shows if you need something special or want to apply EQ, try your gear, etc always ask first, I think I can safely say all vendors appreciate that!