Yeah, i kinda noticed the whine too. I hear people rave about the GT's, and at the lower RPM they where so quiet, but as soon you started upping the RPM i definitely noticed the whine. Any reason why its doing that?

By the way, absolutely fantastic test!

Quote Originally Posted by MagisD View Post
Whoot great job martin.

Strange thing is I found the GT at 40 cfm easier on the ears then 20-30 it had a whine in these tests i don't have that in RL.