every cross bow is loud compared to a compound bow some more so then others.
the heaver arrow the quieter the bow will be you may want to shoot the heaviest arrow the maker recommends.
you can try some of the limb silencers
"Also are the crossbows with recurved limbs better or quieter than the compound ones"
nether one is better or worse then the other, just different styles both have advantages and disadvantages. it is more a personal preference
most crossbows work best with mechanical or smaller profile fixed blade B.H. but if you have some you want to try go ahead and try them and see how they fly