Ok so yesterday I used a freak back with .692 and luxe tip.
Using my phone decibel app. I was at 70-71dbs.
My friend has luxe and was same. Using same paint.
other friend had geo 3 with shaft 4 same paint. Don't know his bore. But his dbs was 70-71.
I went to my ul freak same insert same paint. UL tip. Got 75 dbs.
Accuracy was same.
I will also say I used a shaft 4 from an etha. Don't know the dbs. But the shot was definitely flatter and seems longer. But hard to say. This was on a different day.
Food for thought.
On the contrary. My results match db ratings that other use db meters from yt.
Luxes are in the low 70's. Along with geo's.
So along with nt psi settings and barrel change the sound sig can be reduced.