Originally Posted by HAMP568
Where can I find detailed information about 'Pure Audio' function with the Onkyo 5008?
Pure Audio is the same as 'Direct' except that with Pure Audio the AV processing is all turned off and the display is turned off on the AVR - the idea is to avoid any interference between the video and audio circuits. I'd be amazed if anyone can hear any difference between Pure and Direct.
Does it use the burr-brown?
Does it use audyessy?
Does it use the DAC from the Onkyo?
Audyssey is disabled when using Direct mode. The DACs in the AVR are used if you input a digital signal (eg via HMDI). If you input an analogue signal, then the DACs are not used because there is no digital to analogue conversion required in the AVR in an analogue-in, analogue-out configuration. (The DAC will have been performed elsewhere, eg in the source).
If I want to use ‘Pure Audio’, should I buy an external DAC(maybe Oppo 95)
It is very unlikely IMO that you will hear a difference in DACs, once you reach the quality level of the Burr Brown DAC used in the 5008. Again, you will only benefit if you input a digital signal via HDMI. If you wanted to do the DAC externally then an Oppo 93/5 would be a good choice, or you could buy a standalone DAC (Emotiva have a well-reviewed on that is on Sale at the moment).
Why do I have to turn the volume up, if I am using my PS3?
Because, in all likelihood, the output voltage of the PS3 is lower than your other source(s). Use Intellivolume to turn up the level on the PS3 so that it matches the other sources and you will no longer need to turn up the volume.
Why do analog input sound so much better then digital with ‘Pure Audio’
Some say they do, some say they don't. It seems to be a preference thing. Personally, I prefer to use HDMI for everything because any small difference in sound quality between digital and analogue will be entirely negated, IMO, by losing Audyssey room correction when you switch to an analogue input. Even if there is a difference in SQ between analogue and digital, it will entirely disappear if you have no room correction. If you have an extensively treated room then this may not apply. But if you rely on Audyssey to 'equalise' the room, then turning it off an using an analogue source makes no sense to me. YMMV.
If you can hear vast differences between digital and analogue sources, it may be that your digital source is not as good as it should be. If you switched to an Oppo 93, or even an Oppo 95, then I am sure that you would prefer the digital source + Audyssey to the analogue source without Audyssey.
I hate that I have to use two different settings for movies and music. Going into the Onkyo to change the x-overs, adjust the bass/treble, turn on/off the sub is starting to really bother me.
I love my movie settings, and I love my 2channel settings, it’s just that darn going back and forth.
It is very difficult to get one system to be brilliant for both movies and music IMO, as you are finding. Their requirements can be quite different - for example, on movie tracks you need really deep bass, really loud. On music, bass rarely goes below 40Hz (about the bottom string on a bass guitar) and even then it doesn’t usually need to peak at 115dB!
There is also the issue of Multi-channel v stereo and whether to upmix stereo sources to 5.1 etc. Personally, I prefer to listen to music content in the format in which it was created, so I have a separate (stereo) system for my music collection, which is almost 100% stereo recordings. Oddly, or maybe not, I am very happy to upmix 2 channel movie tracks to 5.1 with Dolby PLIIx though. Again, I think it is because movie tracks are less demanding of us (of us, not the equipment) because there are the visuals to look at on screen and these are bound to direct our full attention away from the sound. With music, this doesn't apply and one focuses solely on the sound.