Big Ron I do build bows for a living. And you are right extra energy not being absorbed by the arrow does have noise but I have found that a lot of bows are not tillered correctly to start with and I have readjusted tiller on many name brand bows over the years and have found that this alone does quiten a bow down a lot and makes them shoot a lot smoother and quiter.
You don't have to accept a noisy bow just because you are shooting light weight arrows. Tune your bow up, check brace height, try the thread seal tape on TD bolts, asdjust tiller, it's amazing the differance you can make to the way a bow shoots and sounds by correctly tuning it...Glenn...