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Hello all, I am getting more interested in computer audio and have a technical question. I recently bought a Denon DM-39s micro system for the office and am really enjoying it. Currently, I have my Mac hooked up to it via mini to RCA (I know, I know RCA is bad). According to the Denon site, the unit has a built in DAC (192 kHz/32-bit D/A). My question is, does the DAC only operate when using the USB input on the front of the unit, or does it also kick in when using the RCA and/or optical port on the back? Interestingly, neither the Denon site nor the WhatHiFi review give any indication about this. I have Audirvana (the free version as I am still experimenting) running on the computer and a few FLAC files. The FLAC files play through the unit no problem. My other question is if I got a separate DAC (I am considering a Dragonfly 1.2), would it override the onboard one or could it be made to do so? Thanks,

[TABLE=class: tborder postbit, width: 100%, align: center] [TR] [TD=class: alt1 postMessageArea, bgcolor: #FBFBFF]Apologise is this has already been addressed, I did see a post on here regarding this a while back but can't seem to find it anymore. I'm streaming from music from Spotify and iTunes to my Denon M39 using Airport Express. I stream from my iPad as well as my Mac Powerbook. Optical in. Seems that the sound quality using Airport Express is better than Air Foil. Also when I connect Airfoil to stream directly from System Audio - the sound seems to deteriorate massively! Can anyone confirm this and also any guesses why this may be? At the moment it seems to be better to stream Spotify from my iPad using the extreme 320 kbps Ogg Vorbis format > that way I can bypass the mildly cruddy Airfoil sound. I've heard iOS iPad streams to Airport at a lower bit-rate than OS X Mac. From what I can hear though despite this the iPad still sounds mildly cleaner minus the Air Foil. Am I just imagining this? I'll continue using iTunes directly with Airplay to play my MP3's and ALAC's [/TD] [/TR] [/TABLE]