If it is only that disc, and you continue to hear it at low levels, but not with any other content, I'd say that nothing has been damaged. Just that something with the audio on that passage doesn't agree with the equipment.

I'd not worry about it. If it a decode error, I wouldn't play it too loud, as harsh digital noise could possible be damaging.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris