Shooting in my backyard yesterday with my buddy, we experimented (again) with arrow noise prior to reaching the target.
Using Cedar,Carbon and Aluminum arrows, fletched with 5" Parabolics, 5.5" HB Shields and 4" four fletch. The distance was 30 yds and we took turns standing off to the side rougly 10 yds from the target.
At roughly 8yds prior to hitting the target, the 5.5 HB Shields had a very loud "Hissss". The 5" Parabolics and 4" four fletch were almost silent.
At 20 yds from the target, we stood off at 15 yds.
Although quieter, the larger feathers still produced the "Hisss".
A 55/75 Gold tip with 5" parabolics proved to be the quietiest of the bunch at both 20/30 yds. Nothing real scientific here but you can see why deer react by dropping just before the arrow hits.