What does the impedance drop to on these RS-II's at decently high volume? I was testing out my Pioneer SX-1280 tonight. I had the volume at 11:00 or so. The Infinities were singing pretty loud but still sounding good. I then engaged the loudness switch for a second and the Pioneer went into protection mode. Just FYI this is about as loud as I would ever listen to anything, but my question is whether I should be looking at my SX-1280 for some internal issues or if this might fall into "I should expect that to happen mode with these RS-II's", mode.