I am glad you went with your instincts. A few months ago I would have said there is no problem at all, but my son has been diagnosed as having partial deafness in one ear and they say that it is from a loud noise at some stage in his life, and it is a permanent hearing loss.

I was very surprised at what was considered a loud noise (ie lawnmower, motorbike), I suppose you won't ever know if you are that way inclined with the hearing unless something goes wrong.

You can google noise decibels and it gives you a list of what is considered noise that can do damage.