Netflix With Roku Over DSL Optimization

Four Tweaks That Helped My DSL Roku/Netflix
Edit: Bottom line is the 37" Vizio model I am using has HDMI incompatibility with both WDTV and Roku. Two other Vizio models I have work just fine. Still, some of the below experience may help in some instances.
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After beating up on my network, I tried USB streaming and found sound distortion so network is not the issue. It must be the TV's HDMI, a cable or the Roku itself. The following DSL tweaks may be worth while anyway. I finally found other Vizio owners with the same Roku 2 sound distortion issues. Only fix is HDMI to component conversion box from Monoprice. Vizio VA370M seems to have no firmware update path. Apparently this problem is new to Roku 2.

These settings may help but if you have a TV that works with Roku no adjustments are probably needed.

DNS (Netflix recommended currently) (set your computer's NIC to other to override if desired)
Primary 208.67.222.222
Secondary 208.67.220.220

MTU (1462 was Netflix suggestion)
Open command prompt.
Ping www.google.com -f -l 1420 (the last switch is the letter L) and keep increasng/decreasing until no fragmentation/no loss then add 28 for header resulting in 1448 MTU ultimate. This was my number but actual numbers will vary. This is to find the ultimate MTU number. Once found the "ultimate MTU" must be entered into the router, often located under the WAN category and usually has a 1500 default. Online chatter suggested 1462, 1492 and others. But this test will give you the actual number that works for your particular setup and location.
See instructions here.

Set Roku MAC addresses to static.

Set Roku Mac addresses QoS (Quality of Service) to highest.

I can finally get through an episode of X-files with no sound distortion. Some movies are still impossible.