Darren, We have 2. Mine is in a heated workshop attached to house with only a steel firedoor in between. Had a phone conversation with my mother today while I was running buttons with the Fein vac going and had to go into kitchen(20 feet) to hear her. Fein is twice as loud as spindle except for 2 1/4" downspirals that are LOUD. With door shut, my guest can watch movies in living room 25" away. Kirk shares his shop with his Dad who is a woodcarver in a 10X12' shop with only pine French doors between them and it is very rarely an issue after 9 months. My shop is 12X20' but I also have drillpress/scroll saw/stationary belt sander/closet/2benches/and 3 work stations in there.
Definitely recommend a Fein turbo II with a Dust Deputy with the HEPA filter in an enclosed space, also the mini-enclosure from Shopbot(Kirk has one) greatly contains chips when surfacing/dadoing/long tools where the dustfoot with 2" brushes isn't contacting the whole work surface. No dust noticeable in my cold coffee at end of day and no noticeable sawdust tracked into my house (dark red concrete floor) from my wheelchair wheels.
Run a good quality vacuum cleaner (Mielle or equivalent) and that's about the sound level for the majority of our cutting.
scott P.
2013 Desktop/spindle/VCP 11.5**
Maine