Noise does not bother Yogi and Booboo around here . I have been coming back from fishing at the reservoir behind my house and had bears on the path ,so here you are yelling at it and waving your arms and making all kinds of noise and what do they do but just look at you like you are nuts . I have come up on them when I was on my quad and all they do is sit and stare like they are daring you . I was on my Harley one morning a a small road and a bear was sitting on the road . You would think he would have move when he heard the bike ,load pipes and all ,but no .I sat there and waited till he decided to get out of the way . These animals are not scared of you or anything . A lot of people would take air horns with them when they would go out for a walk but found they were useless . The only thing that sometimes work to get them going are
paintball guns .
PS Punji steak like deterrents are not cool .Dealt with that kind of stuff 44 years ago and would not do that to anyone or thing . Leave that kind of cr#p to mister Charles .