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Teac DAC and AAC/PCM problem?

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john_caius's picture
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Hi guys,

I've decided to go for the Teac UD-H01 (via USB from laptop) as part of my first seperates system. However, on reading the manual online (ultra-keen), I came across something slightly disturbing on page 9:

"The input indicator blinks when the input signal is not digital audio data or the format of the audio signal is not compatible with this unit such as AAC. If this happens, set the digital OUT setting of the connected device to PCM audio output".

1) Since most of my music is iTunes AAC, does this present a problem in terms of audio quality?

2) And, if applicable, how can I make W7 output PCM audio?

I have done some research, but can't find a satisfactory explanation or solution. Bit perfect audio is always a nice aspiration... 

Cheers,

Matthew

Andrew Everard's picture
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RE: Teac DAC and AAC/PCM problem?

1) No

2) It's not tricky, but there's a pretty good guide from Audioquest to walk you through the set-up: you can download it as a PDF here

And don't worry about bit-perfect audio, since the AAC files are by their very nature compressed using lossy compression, and therefore not bit-perfect to start with!

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john_caius's picture
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RE: Teac DAC and AAC/PCM problem?

Thanks Andrew, especially for the AudioQuest guide. Good point about the AAC/bit perfect dichotomy...

However, I am currently downloading/ripping to WAV files (no HD stuff though) - so I would prefer my set-up to be at least a bit future-proof.

Therefore, is therefore anything I can do to maximise quality of iTunes 11 (Windows 7) sound output beyond:

- Disabling sound enhancements, EQ etc.

- Setting QuickTime to use WASAPI (although not sure if this changes anything in iTunes, since post-10.5 it no longer requires QT?)

Dermondo's picture
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RE: Teac DAC and AAC/PCM problem?

I recently purchased one of these units and am just enquiring how are you finding the sound quality overall and do you feel that it needs a benificial run in time ?

Andrew Everard's picture
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RE: Teac DAC and AAC/PCM problem?

john_caius wrote:
Therefore, is therefore anything I can do to maximise quality of iTunes 11 (Windows 7) sound output

Ummm... use Songbird instead? Wink

I have to say that despite being a card-carrying Mac user – company-supplied MacBook Pro and iPhone 4, own iPad 3 and iPad Mini, and my wife has a 'plastic Mac' MacBook, iMac, original iPad, iPad mini and iPhone 4S – I'm no great fan of iTunes even on the Mac platform, and find it even more obstructive in Windows. I only use it to download podcasts and do the occasional update on one of the many devices.

Hmmm... that feels better!

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Overdose's picture
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RE: Teac DAC and AAC/PCM problem?

Andrew Everard wrote:

john_caius wrote:
Therefore, is therefore anything I can do to maximise quality of iTunes 11 (Windows 7) sound output

Ummm... use Songbird instead? Wink

I have to say that despite being a card-carrying Mac user – company-supplied MacBook Pro and iPhone 4, own iPad 3 and iPad Mini, and my wife has a MacBook, iMac, original iPad, iPad mini and iPhone 4S – I'm no great fan of iTunes even on the Mac platform, and find it even more obstructive in Windows.

Hmmm... that feels better!

iTunes 11 can't have helped then. Smile

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john_caius's picture
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RE: Teac DAC and AAC/PCM problem?

Dermondo, afraid I haven't recieved my Teac yet, so I can't advise on SQ or burn in time (if applicable).

I know using iTunes is arguably incompatible with very good audio output - just trying to find the least of all Apple evils! I'll look into Songbird.

 

john_caius's picture
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RE: Teac DAC and AAC/PCM problem?

Dermondo, I'm about 20 hours in on the TEAC and am very impressed (although given this is my first seperates system, don't take that too seriously). I have noticed some improvement over the last 10 hours or so - but that's far more likely to be my new BX2 speakers than the DAC.