S&P mixvent and speed controler work outstanding

I got my fan speed controler today. I have a S&P td-150 6inch fan. It is quiet to begin with. I hooked up a fantech WC-15 http://www.hvacquick.com/frfnconfig.php?fm=wc
very little hum almost non existstant on the slowest setting (quieter than an airpump). Even has a set screw to adjust the minumum lowest speed setting. Works on both high and low settings flawlessly.

Hey Desert Fox, you mind reading my most recent updated on the fan I was testing. https://www.rollitup.org/grow-room-design-setup/199168-line-fan-best-4.html I think I might purchase the same fan you did. Have you ever used another fan to compare it to? Do you supposed the fan it self is what is quieter, or do you think your speed controller is allowing the fan motor to not buzz?

A lot of people say they own this fan, can some one tell me there results with a fan speed controller connected.