In response to KlipschGuy (BTW, change the name please. Would you like me to ask Amie to change it for you? ), taking measurements this way is definitely heading down a questionable path...especially music. The problem of course is as Randy plays music, we have no idea what the frequency is and hence the impedance of the speaker.

And KlipschGuy is definitely right. There is a risk in frying the tweeters so I am sure Randy kept the duty cycle of the blaring short.