wrote:
Like this, maybe?
http://www.pennstateind.com/store/sup1000.html
I remember somebody else posting about this, but he said he ordered his
DC with it, and doesn't know how it sounds without one. :-)


My suggestion is to build a closet, that is what I'm going to do. My HOA
wouldn't like it if I put my DC outside either.

The muffler must reduce air flow to dampen the sound. I used a sound
level meter in my shop and got the following readings:
DC - JET 1100 with Canister and Remote 1.5 HP
- At motor - 92 dB
- At duct where muffler would be - 88 dB
- Against lower bag - 114 dB
- Air leak at a 4" dust port - 92 dB
- Ear level at my lathe 15' away - 72 dB


If the velocity of air into the bag were reduced, then that would reduce
the sound level "against the bag" significantly. So, if I were to get
that muffler, then the quitest my DC would be is 92 dB, since the
muffler would have zero effect on the sound generated by the motor. 92
dB is still loud, but the reading was taken at 6" away from the motor.

The muffler is advertised to reduce sound by 5-10 dB, and it probably
will, but at the expense of air flow.

Not all tools are as loud as the DC. My bandsaw isn't that loud and my
lathe only puts out 55dB at high speed.

--
Brad Curfman
http://www.curfman.net