Quietest six inch inline?

my 4 inch hydrofarm active air inline fan is just way to loud for where i live... what are your opinions on the quietest inlines?

no opinion. but i've always managed to buy the cheap ones and make them quite. if they buzz you can normally fix it with some thought. if the fan blades rattle or vibrate a little i found spraying a little pam cooking oil into the intake side to smooth the sound out a bit. i'm not says soak it but a light spray will really lube it and help. Also you could try using sound deadener. you can get it at automotive and car stereo stores. if you oil and apply sound deadener you should be able to cut the noise way down.