Thanks JG and Jim.
The drop from 4" to 2.5" OD is made using one of the standard reducers. So
the length of the actual 2.5" fitting is less than two inches and very
smooth. I taped up the fitting with some Duct Tape and the pitch of the
sound has dropped quite a bit. So I guess some of the air was leaking around
the fitting. Although it's still a bit annoying even with the ears. Actually
attaching it to the saw port, seems to drop the pitch a little more.
On a side note, one of my SA friends suggested that I drill some holes in
the fitting and experiment with the shape of the opening to see if I could
play a tune.
As for making intentional leaks, I understand where you're going with this.
But, I had read that I would need 1.5 HP and a 12" impeller to create enough
CFM and Static Pressure to handle the Table Saw. Since I'm now where near
this now, I guess I'll have to live with the improved noise.
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