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Dac Questions from an Analogue guy :

As you can see from my Forum name I am a vinyl enthusiast at heart but do from time to time have digital needs so to speak. Upon learning that my DAC on my old CAL LABS ICON MKII Cd player seems to be dead as there is no audio out of the RCA's I figured I would use the digital coax O/P utilizing a friends PS audio NUWAVE DAC since I have never used the digital coax out before. I figured the player was not totally dead because of the fact that when a CD was inserted into the transport all the of the CD info appeared on the player. So I gave it a shot and voila it worked with very nice results. Simple, done. My curiosity furthered me into the other connections on the unit being the USB and the optical. I gather the Optical acts as a link such as the digital coax from my CD player but the USB connection puzzled me a bit. Having looking at the specs of the DAC, it of course is capable of 16/44 audio but can also do 24/96 and 24/192. Of the 2 latter formats, how are these utilized? Through the USB say using a computer or note pad device? I did not do any research as you can see, so these questions I know are rather rudimentary. Do correct me if I am wrong, is the 24/96, DVD audio? ANyways, my whole curiosity of this is how one utilizes the USB connections and all the higher resolution audio features of this DAC. How is the overall Audio quality of these formats? What are my options if I want to delve further into this? yeah I looked on the Net and saw a huge plethera of products which confused me even more so you can say I am a bit brain lazy when it comes to this whole digital format.
I do have an Ipod with MP3's mostly for my car but I can't see that being the end to be all to be utilized with the Dac since I personally find that this overlly compressed format to be inferior. Anyways, any answers starting from 0 would be greatly appreciated.
vinylmad814

Showing 3 responses by realremo

realremo
460 posts
 
DVD Audio is a different format, similar to SACD I think. 24/96 and 24/192 are high resolution methods of recording music. You must use a laptop or computer to pipe 24/96 or 24/192 music tracks into your DAC, but to play DVD-A or SACD discs, and these formats only comes on discs as far as I know, you need a compatible CD player. DVD-A has pretty much gone the way of the dinosaur, SACD won that battle. Check out SA-CD.net for current titles. I don't think the SACD signal can be sent into the DAC you have, you'd need a new player.
If you own CDs currently, you can rip them to a lossless format like .aif or .wav and they might sound better on your iPod, but this depends heavily on how you get the signal from the iPod to your vehicle's stereo, typical methods for this harm the sound quality and won't beat the SQ of an in-dash CD player.
You can rip your vinyl to digital files, using a number of different software packages, and play them through your DAC using iTunes, JRiver or FooBar from a computer or laptop. You can do the same with your CD collection, just use lossless formats, not .mp3...
realremo
460 posts
 
Vinylmad814, I have a computer based front end, and have done extensive research in the areas of redbook CD playback and upsampling. The CDs you gave your friend can all be ripped to FLAC, or WAV, or AIF, all of these are lossless formats. WAV and AIF can be played by pretty much any software player out there, FLAC cannot be played back on iTunes to my knowledge. High-res files, i.e. 24/96 or 24/192 files you buy on HDtracks.com, can also be formatted into these same file types. What you will get from your friend ripping your CDs will be 16/44, which is the standard for CDs. 16/44 can still sound very, very good; like everything else, it is all about the quality of the recording.
Upsampling is not the same as playing a high res track. Your DAC upsamples the signal to 24/96 or 24/192, but the music signal you are sending the DAC is 16/44, if you are using the CD rips your friend is providing. Upsampling is pretty much what all modern DACs do, it re-samples the 16/44 track at a much higher rate, and it is supposed to push noise artifacts beyond the range of human hearing. Highs are supposed to "smooth out." I cannot really test the difference between a 16/44 track played at 16/44, and that same track upsampled to 24/192, because my current DAC upsamples only, I don't have the choice of non-oversampled playback. So I cannot say that upsampling sounds good or bad, I got into this computer-based-audio thing kind of late. I can say that my PC-rig mops the floor with my Denon changer in sound quality, but the cost differential makes that comparison unfair.
If you purchase iTunes music in 256K mp3 format, those are *not* high res files. the MPEG3 codec cannot push high-res data at that low of a rate (256K).
realremo
460 posts
 
I go to RMAF every year, and have heard some truly incredible digital-based systems there. A $7000 DAC is not a price range that I will ever be in, but happy listening to those that are!
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