I bought both the 150 and 200x just to do tests. I already own a 4" can-fan, a 6" eco plus high output and an 8" high output vortex. If I were to do a sound comparison test I would use this link to go by for Sone values:
http://www.canfilters.com/fan_metal_home.html
Look at the right side of the chart. Can-fan lists the sone values of all their fans. If you are in a Home Depot one day, go to the bathroom fan aisle and do a test yourself with their fans. All of the fans their have sone values on them. You can really hear a major difference between a sone value of 2 and a sone value of 4. 2 is ok but 4 starts to get a bit loud.
Of course loudness depends on how stealthy you want your room to be. I want mine to be super quiet so I'm looking for sone values at ear level to be between 1 and 2. This way someone in my house will not hear my fans even if they were standing in front of the closed grow room door and was having a conversation with me. You would hear a slight hum standing outside my door only if everything was totally quiet. This would equate to about 1 to 1.5 sones.
For super quiet I would definitely go with Panasonic whisperlines. The 6" I have for my super stealth bedroom veg room fucking owns all. It keeps a 400 watt mh at room temp. My room is a 4 x 4 x 6.5 tent. I could put a 600 watt in there and it would stay room temp with that fan. With the 400 I can keep my hand right on the glass. The 6" is rated at 1.4 sones and let me tell you this, I can barely hear the wind rushing from my bed only 5 feet away. If I used insulated flex it would prolly go away all together. Damn crickets outside my window are 10 times as loud as my whiperline.
I'm stoned. Dont know why I bother writing so much.
I can prolly give every single fan a sone value by now. The 4" can-fan is prolly around 5 sones. The 6" hi-speed eco is prolly around 12 sones.....has a very whiny sound and the 8" hi-speed vortex is prolly the same or a bit less as the 6". Maybe between 10 to 12 sones but no whiny noise. More like a jet engine roar lol.
I would rate the TD-150 at about 2.5 to 3 sones. It was almost equal to my bathroom fan which is 2.5 sones. The TD-200x is way louder but not near the 6" eco or 8" vortex. I would give it a value of around 7 or 8 sones. Much too loud for my liking but others who don't mind sound would love this thing. It's a mule and can pull a ton of air. You don't need any of those big assed fans for a small job and these things fit anywhere.
I tried both fans out on my Can-filter 33. Do me a favor, check out the specs real carefully for both items. The filter says it's rated at .75 for max pressure. The 150 says it can barely pull 50 cfm (LS) at .75. The 200x says it can barely pull 215 cfm (LS) at .75 pressure. This is all according to their spec sheets.
After a lot of research I found 2 different spec sheets for the TD-series fans. I will post them here:
http://www.hvacquick.com/catalog_files/solerpalau_TD_Catalog.pdf?PHPSESSID=nlsj7q7ioalq99u0mj55u8sm42
and
http://www.kitchensource.com/range-hoods/pdf/td-specifications.pdf
In all honesty I think the second link has the more accurate specs. They show the fans being quite a bit more powerful and I will have to agree 100%.
I sat the 200x right on top of my Can-filter 33 and that baby just blasted away. Easily pulling way more than 300 cfm. The specs in the second link match more closely with what I think is the right amount of cfm. I also mounted the 200x in other places but still found it much too loud to be used for my purposes. Oh, I forgot to add that I did this wired in Low Speed.
I aslo sat the 150 on my Can-filter 33. VERY pleasing sound levels. It pulled a ton of air even set at low speed. I wish I could measure how much exactly was coming out but I would have to say it was easily over 100 cfm. This was also wired on LS. This seems to beat the specs from the second link. These fans are way stronger than advertised...........at least the 150 and 200 are.
I need to do a few more tests on temp changes and air flow. I'll get back here another time