About a month ago i got upgraded from optic with 15 speed internet to optic with 4 HD streams and 50 internet. To do this the tech had to bond 2 lines, and replace all my boxes.
Since the upgrade i have noticed i have to turn my volume up more then double what i had to before on all my TV's. All my boxes have the internal audio turned all the way up to 25. I am using HDMI to connect the boxes to the TV or audio receiver.
I doubt you'll find any easy answer to this problem. Telus has other audio volume problems with OptikTV, but they don't seem to think it's important enough to do anything about it. The reason it's important of course is that when the volume varies greatly between channels and sources, you frequently get blasted with speaker-busting high volume when switching.
In particular, the HD channels and SD channels have widely different volume levels over the digital audio output, and Netflix is down there with SD channels. It might be a difference between DD surround sound and stereo since that would also line up with those sources.