What does a case window do to noise?

[MajinWade]

I wonder if those of you with case windows could help enlighten me. Do you notice a decrease, increase, or same levels of noise?

 

[Crucial]

I didn't notice any change in noise level. Then again my ears aren't NASA calibrated.

 

[Dundain]

My parents noticed a difference when I put a small window in their case They're pretty sensative to noise and the plexi I used was alot thinner than the metal panel it replaced...but I doubt you'll generally notice much of a difference.

 

[CubicZirconia]

My friend and I both have an hhc-001 heatsink with the same hsf. I have the lian li pc 65 w/window and he has an enlight 7230. There is absolutely no noise difference that either of us can notice.