Recording 48Khz digital audio

Question

Level 1

4 points

Recording 48Khz digital audio

I'm having trouble transferring audio from DAT at 48kHz to my new Mac Pro. The Apple audio input changes back to 44.1kHz regardless of what I set it to. I've tried three different software options (Amadeus Pro - my usual tool, and also Sound Studio and Audacity)

I used to use my MacBook Pro to do the same task, but I've since sold it. I tried a new Aluminium MacBook as well with the same effect. Is this a bug that's crept in in recent Apple software or hardware, or is it just me?

I checked the digital audio output from my DAT deck (which I'm converting from Coax to Optical) via my Denon AV Amp and also via my Minidisc recorder and they both play it back fine.

Very Frustrating...

Mac Pro (Early 09), MacBook, PowerMac G4, eMac!, Mac OS X (10.5.7)

Posted on May 17, 2009 9:18 PM

Reply

Answer 1

SStreet

Level 1

10 points

May 18, 2009 6:47 PM in response to KenTaylor

Just to be 100% sure, have you gone into /Applications/Utilities/Audio Midi Setup.app and adjusted your digital input settings? It appears the default is 44.1kHz.

Reply

Answer 2

KenTaylor Author

Level 1

4 points

May 18, 2009 7:11 PM in response to KenTaylor

I've now tested it with my Mac Mini, and it works fine - so it's definitely a bug with the newer hardware.

..and yes - I said in my original post that I'd set the Apple input to 48k - it seems to "autodetect" 44.1 and go back to that - whereas the Mini correctly "autodetected" 48k.

Reply

Answer 3

May 18, 2009 7:39 PM in response to KenTaylor

Hi,

i've tried to find the apple support document without success. Essentially I had a problem with sample rates and the new MacPro, though in play back rather than recording. Returned one machine and got another. Better, but essentially limited to 44 and 48, possibly 96, definitely not 88. The support document I can't find now said something to the effect that in some MacPro's the sample recording rate was limited. I don't know if it's hardware, hope that it's software and will be fixed. With a new machine you could try contacting apple support, but this is a fairly specialized problem, on the other hand, MacPro users usually have a specialized task, and require a machine that will perform it.
Please post back if you get an answer or a solution,
Good luck,
Ray

Reply

Answer 4

May 18, 2009 7:41 PM in response to Raymond Nelson

Hi,

I should make clear that this was through the digital optical port.

Ray

Reply

Answer 5

KenTaylor Author

Level 1

4 points

May 18, 2009 8:33 PM in response to Raymond Nelson

You mean this support document:

http://support.apple.com/kb/TS2315

Yes - I've read it - it says that 44.1, 48 and 96 should work, but not others.

But 48 Doesn't work on either my new Mac Pro or my Aluminium Macbook, but it works on my older Mac Mini with the same software and external devices

Reply

Answer 6

May 19, 2009 6:42 AM in response to KenTaylor

Hi Ken,
Yes, that's the document I meant. It doesn't directly address my problem either. Maybe it's no more than an acknowledgement that a problem exists. I hope there's a software fix in the works.
Ray

Reply