Silentcutting (wouldn't allow me to quote for some reason!)
Let's answer a few:
1). Check the levels of your input device. Select what you want to listen to then press the enter key on your remote. If the levels are too low, increase them. Next, bring up the menu then select the input device on screen - go to source select then other then SRC level. Increase the dB for either analogue or digital as required.
2).Search the firmware thread regarding upgrades - http://www.avsforum.com/avs-vb/showthread.php?t=995566
3).Same as for answer 2 - refer to the first page of the thread.
4).Probably because all your speakers are playing the source it sounds louder. Remember that you need to set up each input (CD, DVD, DVR, Xbox, etc) individually for input levels, front L/R, Rear L/R, Sub, etc (enter key on remote again).
5).Subwoofer only - I suggest that you read this thread (#143): http://www.avsforum.com/avs-vb/showt...45#post7969145
7).Not sure about this, but you can always connect your PC, etc by ethernet and stream music, so depending on the connection to your router, you should be able to do the same. Have a search through this thread.
8).No - but others have made recommendations. Again, search the thread. However, I run my Denon for many hours on end at high volume (DVD viewing sessions) and its only the plastic cover over the top of the heatsink (power transistors) that gets hot - make sure you have good ventilation all round.
10).Good quality speaker wire makes a huge difference as does good quality interconnects. Banana plugs are great if it's a bit tight around the back (also good if you bi-wire your speakers as it makes it a lot easier to get two sets of wires in there. Just remember to remove the little black plugs in the speaker posts as they aren't obvious!).
11).Make sure that you have set the surround options for each source - e.g., for my PS2 and Wii, they are both set to PLII Game. My DVR is set to PLII Cinema, etc. Check auto surround settings as well.