ORIGINAL: brucelanthier
I think an advantage of adjustable DW that a lot a folks don't take advantage of is in tuning. If you build your arrow for a 65# DW then you can adjust the DW up or down a pound or two to fine tune the bow and arrow for the best dynamic spine. All too often I see that guys have a 60 or 70 # bow and it is maxed out. It may be a little more efficient and quiet when maxed out but, with todays quiet bows and bow technology, a 70# bow that is set to 65#'s or a 60# bow that is set to 55# will be immensely quieter and more efficient than a bow of 5 yrs ago and those 5 yr old bows were quiet and efficient enough to kill a lot of deer.
This is one of the first things I learned (the hard way) back when I bought my first compound bow. I shot fingers and sights with a 2216 arrow with a 125 gr broadhead. I started at a lower draw weight and progressively increased it. At 66 pounds, the bow/arrow combination shot fabulous. Not knowing any better I was determined to reach 70 pounds+. I finally reached 72 pounds and saw my groups starting to spread out (get worse). I thought it was just me, but no matter what I did, the groups never got back to the nice tight groups I had at 66 pounds. Finally I got smart and tried putting the weight back to 66 pounds and the tight groups came back. Now I tune all bows to my arrow.