No problem Briar, I realize the speed of sound and all that. But also don't forget to factor in deer reaction time. You guys act like the deer, at the very millisecond the speed of sound reaches the deer's ears, that they can magically disappear!!! LOL
My point is, with the increased FPS arrow speed I get from my crossbow(350), as compared to my compound (300),it is enough speed in my experience to be a non-factor when shooting within 50yds. That has been proven out in my case in that I have not had any issue with string jump while using my crossbow to kill quite a few deer. Not enough anyway to cause enough movement as to adversely affect my POI.
Let's factor in another point. How much quieter do you think you will get changing crossbows? 10%,20% 30%? There's still a noise reaching the deer. Whether it's 10decibels, 30,50 whatever. You're not going totally silent are you? No, of course not. So, with that being said,unless you can site a study that shows the degree of sound that spooks a deer and the degree that doesn't, it's really a non-factor at those FPS levels.
Just my experience, that's all.