85db is respectable, but you'll still want to be using hearing protection
85db is respectable, but you'll still want to be using hearing protection
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The most expensive tool is the one you buy "cheaply" and often...
But if you are going to report numbers and get comments based on those numbers, things move to the quantitative. Maybe a real sound meter would be useful. I don't trust the microphones and sound measuring apps on phones. There are many sound meters available in a wide price range. This is the one I use: https://www.amazon.com/gp/product/B000EWY67W
I think a sound meter is nice to have around. But then I might not be the best judge of what is nice vs necessary. I also keep a lux/fc light meter, thermocouple reader, precision thermometers, infrared non-contact thermometer, wind speed meter, humidity sensors, capacitance and amperage meters, precision voltage and frequency standards, digital oscilloscope, scales accurate to 1/100 gram, laboratory microscopes...
JKJ
I really like my Clearvue, but it was very loud when I got it. A properly designed closet is probably the most effective way to quiet it. I did several things to mine which got it down to an acceptable sound level. I put a muffler on the outlet but I'm not sure it helped much. I modified the gore point in the blower and that reduced the 2nd harmonic (700 hz) of the blade pass frequency significantly. It didn't reduce the blade pass frequency (350 hz). There was also a lot of noise emitted from the blower housing. I put sound barrier on it and that helped a lot. Sound barrier blocks sound. Not the same as sound absorption material.
Last edited by Bill Webster; 02-24-2020 at 7:20 PM.
I used Rockwool, and then hung thick moving blankets on the walls. The acoustic tiles were a waste of money. Plus they keep falling off the ceiling.
The heavy moving blankets added 25+ dB in noise reduction for a very minimal cost. Very highly recommended. I get them on Amazon. Get the heavy ones. Otherwise, the other recommendations above are great.
- After I ask a stranger if I can pet their dog and they say yes, I like to respond, "I'll keep that in mind" and walk off
- It's above my pay grade. Mongo only pawn in game of life.
Ok, I've forgotten what the gore point is and how to modify it. Is that related to the small block inside the housing. Is all this in the Pentz document?
I made no modifications to mine other than stuffing the empty volume above the spiral chute with fiberglass to keep out the dust.
JKJ
The small block didn't help mine. The gore point is the corner at the outlet where the air is sheared off. I added a wedge in that area.
John, Bill Pentz has some info on Gore Point, but this still leaves me confused how the wedge works.
Search for Gore Point here-> http://www.billpentz.com/woodworking.../equipment.cfm
Sorry for the delay, it took me forever to find those old 2012 photos of the gore point wedge. They are not very good photos, taken very close in poor light. But I think you will get the idea. The curved piece at the bottom of the tapered sheet metal wedge is plastic. If this modification reduced the efficiency, I couldn't tell.
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Last edited by Bill Webster; 03-07-2020 at 3:26 PM.
I also wrapped the blower housing to reduce noise. Foam does not normally block noise, it's usually used under a barrier to absorb noise energy. But I had some very dense foam from a bed mattress that worked pretty well as a barrier.
https://www.youtube.com/watch?v=U95TGhwuKxo