I probably won't be much help, but here we go.
Check the different audio output options in the DVRs menus. I'll go check on mine later and report back.
Check the volume output from the DVR sound volume control.
Can you try any different equalizer/audio settings on the receiver?
I am just beginning to read this stuff about house curves etc. This is more around the subwoofer, but I am not sure if maybe it is related. I think I may pick up one of these EQs either way.
http://www.hometheatershack.com/forums/bfdguide/http://www.hometheatershack.com/foru...ed-how-do.html
Well hopefully this is better than nothing as you didn't have any replies yet!

EDIT:
MENU -> SETTINGS -> Devices:
Audio: Digital Output - Dolby Digital, HDMI, or Other (I am using dolby digital. I don't have HDMI from my DVR, just an optical cable to my receiver)
Audio:Range - Wide, Narrow, or Normal (I am using Wide)
Audio: Volume Control - Variable or Fixed (I have Variable)
MENU -> SETTINGS -> Audio/SAP
Only option is digital.
EDIT2: Taken from Mark Tranchant.
Quote:
Originally Posted by
Mark Tranchant 
This is a dynamic range control. Dynamic range is the ratio of "loud" to "quiet". Imagine your typical thrash metal concert - that has a very narrow dynamic range (very loud to very very loud). A classical concert will usually have a very wide dynamic range (ppp to fff).
The classical concert is successful because the audience is quiet, the hall acoustics are good, and the "loud" end of the range is really surprisingly loud.
In the home, you'll probably need to play a recording of that concert quieter than "real life", which will push the "quiet" end into inaudibility, especially with a less optimum acoustic environment and higher background noise; the "middle" of the range will be annoyingly quiet and the loud bits will still be loud.
Movies are similar - from whispered (yet critical) dialogue to earthquakes and explosions. If you have the volume set to catch the whispers, you'll be diving on the volume control to tame every explosion.
The dynamic range "narrow" setting compresses this range, making the whispers louder and the explosions quieter. I'm going to guess that "normal" is still a slight compression and "wide" is no modification, but it's possible that "normal" is no modification and "wide" is actually an expansion of the range.
Using this setting for music reduces the accuracy of what you hear, but it's all about enjoyment in the end!
Quote:
Originally Posted by
velrahnkoon 
Hi all,
Not sure this is the best place for this, but I'm hoping someone can help me or redirect me to the correct place.
We recently got a 55" Vizio HDTV, an Onkyo HT-S6200 HTIB setup, and a Samsung Blu-Ray player (Yay tax return!).
I have the Cisco 8640 DVR connected to the Onkyo via HDMI, and the Onkyo out to the TV via HDMI as well. The Blu-Ray is not hooked up yet as I forgot to get a third HDMI cable

I noticed an issue last night that I can't find a solution for that occurs with some of my son's cartoons. The music volume of the show works just fine, but the actor voices are severely muted. I've also noticed this happening with some commercials as well - the audio will be almost completely muted out.
Is this a cable box issue or have I set up something wrong? Does the cable box need to go directly to the TV, and then feed the TV audio to the receiver?
Thanks for any help you can give me!
Richard
EDIT: I've seen the 6 page data sheet on the 8640 on the web, but is there a full-blown instruction manual out there as well?
Thanks