Originally Posted by Marshall F
I've yet to decipher the logic behind the model #'s themselves - any clues?
It seems like these are model year designations. Like cars, they come out a year ahead - so the 7400 and 8400 I got were released in 2003 for the 2004 model year, the x500s were released mid-to-late 2004 for the 2005 model year, and they introduced the x600s a few months ago.
Another poster mentioned that some models don't have adjustments to raise or lower the power going to the front speakers. I would think not having this could be an issue.
The "power"? Did he mean volume adjustments by any chance?
I certainly haven't seen this in my 7400 and 8400, but if it wasn't there it wouldn't be the end of the world. The intention with volume adjustments for each channel is to have them all even. So if you couldn't adjust the front channels (I assume left and right), you'd just adjust everything else to match them.
The problem would be if the left channel volume doesn't match the right channel volume. Setting them differently will be required if your setup is not spaced exactly centred in the room.
I also have another question - If I end up feeding my PJ an HDMI video signal - would it cause problems if receiver does not have DVI audio input?
DVI is a video-only format. It's been replaced by HDMI.
If you were to feed a projector an HDMI signal, all you need to do is feed your receiver a digital audio signal through optical or coaxial.
This requirement changes for the new 7.1 discrete formats like I mentioned, but if you're sticking with 5.1 you will not use these anyway.
If you ever upgrade to 7.1, you can use the external analog inputs on the receiver. The 7400 and 8400 all have 8-channel (i.e. 7.1) inputs, so they will be fully compatible. Check earlier 7.1 models though as they may or may not have full 8-channel inputs but may be using 6-channel (5.1) inputs. However analog inputs will usually be inferior to HDMI for 7.1 discrete sound.