I did a very non-scientific test last season.
I went into my backyard, walked 70 yards away and grabbed my fairly expensive camera and external mic and had it beside my foam target.
I fletched up a bunch of different combinations of vanes, shot the all thru a Mathews Halon 32 going about 310 on a whisker biscuit (I know, bullsh!t, how can a WB produce that fast of a velocity
)
Arrows were Victory VAP with either a 4 or 3 fletch from a bitz right helical 2 or 3 degree.
field points on a 29.5" arrow - 70lb draw
I yelled out every arrow combo before firing and then extracted the audio and processed it on the computing machine.
results were as follows in order of loudest to quietest
blazer 4 fletch
blazer 3 fletch
tac 4
tac 3
Q2I fusion 2.1" 4 and 3 fletch
AAE hybrid stealth 26
Q2I fusion 3" 4 and 3 fletch
I'm running the fusion 3' 3 fletch now.
Tac was severely overpriced and underperformed in my opinion.
in terms of heard audio there WAS a noticeable difference between blazer and every other vane but not enough between the TAC and Q2I (except price)
on the screen, audiogram wise, there was a noticeable difference across the board.
how deer perceive that compared to humans, only john dudley knows..or so he claims