It is funny because the the broadcasters had remarked earlier in the game how it was "amazing" how the Colts fans were so loud when the other team was on the field, but silent when Manning was on the field.
I also noticed this. Nantz and Simms were commenting on how awesome the Indy fans are to keep the noise up for so long during the games and be so quiet when Manning is on the field.
I also noticed the weirdo sound during the game too. It sounded like something (a sound clip or something) was caught looping or something and then quickly faded out. I thought it might have been then broadcast (CBS's fault) but Nantz was calling the play and he sounded fine at the time. It was really, really, really strange.
People are saying in the youtube comments they were at the game and it sounded fine and this was a CBS problem. But if it was in fact a CBS problem with their on field sound feed why did Nantz sound fine through it? Usually sound problems broadcast side involve resetting ALL the feeds when one loops or screws up. Had one of CBS's on field mics malfunctioned they most likely would have reset everything including commentator feed. This never happened which is a strong indication this was not
a CBS error in my opinion.