well x bows are so loud due to how they work, first they hold a ton of energy, energy being released makes noise
second, the string typically slaps and drags about the Barrel, the part the arrow/bolt rest in/on, plus the bolt also is being dragged some what along it as it goes down range
third much heavier strings being used and even cables, in a MUCH smaller wheel to wheel set up, and it all hold noise ,
and well it all gets released as the trigger is released in one fast release of energy
Things that can help , well, all the hype of anti sound dampening devices and anti vib , plus heavier bolts/broadheads, , and well maybe even them dampening Nocks??, type things for bows can help a LITTLE on X bows too, just honestly don't expect great gains
if your quiver is still attached to the X bow, that that off, can help right there with noise too!
the only and best true way is to buy a X bow that is most efficient in its materials, and build
From my experience, the reverse limb design X bows are by far the quietiest I have seen , in shooting next to other x bows at the same time, they also balance better, due to the design, they put the weight closer to the shoulder, unlike traditional X bows that have so much far out weight away from shoulder
I personally think, it absorbs sounds better with this design, where as other designs, blast that sound at the very end of the Bow, where most of the limbs/material is still
The good news is, even the fastes bows of any design, x bow long bow compund or ?? bow, they all make noise, and are NO where near the speed of sound, yet can kill deer all the same
the key is to try to take shots as close as possible, and on game that is relaxed, and not on edge, to prevent them from jumping the string, as they say!
this is one of them things so many suggest before buying a bow
SHOOT as MAny as you can, to see hear feel how they work, and not buy blindly, based on a name or some other reason
NOTHING beats shooting bows before buying!