I'm so glad you got tickets....as far as the noise level, we went to the High School Musical Concert back in January at the ACC and yes it can get really loud, mostly from the 20,000 screaming fans. My dd wouldn't wear earplugs (first concert too) but she did clamp her hands over her ears most of the time. We're so very excited about the concert and regardless of were you sit its bound to be a fabulous show. Just think of how fortunate we are to get tickets when it sounds like, thousands across the U.S. weren't able too!
P.S. If your all interested after the concert, you might want to head down to Nathan Phillips Square where they have their annual Xmas light show with fire works, bands and ice skating of course. We are usually down in the city this particular weekend (staying at the Sheraton Centre) anyway to see the Ross Petty Show at the Elgiin/Wintergarden Theatre, so adding Hannah to the mix is making it one very exciting weekend!
Cheers!