1 Topic by N00b (edited by N00b 2020-03-02 18:26:15)

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Topic: Bit test: how to test 48 kHz flow?

Hi!
I've checked that my audio chain is bit perfect with the files provided by RME: bit perfect I am! (iTunes on my iMac, USB).

I want to check now my video set up: I often play video files on my Mac with VLC and send the audio+video through HDMI. My TV is connected to the DAC via Toslink and it works like a charm.

I just want to check if the audio is bit perfect (no resample by the player, OS or the TV) but no 48 kHz files... The 96 kHz bit test fails.

I remember that MC wrote it is possible to do so by editing the bit test files, does anyone can help me with this procedure?

Thanks!

ADI-2 DAC (with stock PSU) - Neumann KH 310 A monitors - Cheap USB and XLR cables

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2 Reply by Curt962 (edited by Curt962 2020-03-03 00:57:22)

  • Registered: 2019-01-07
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Re: Bit test: how to test 48 kHz flow?

N00b!!

I wish I had an answer for you, but I feel this matter would require an RME intervention.   A means of getting a Bit Test File to your TV, and a 48khz "Checksum" embedded in your ADI-2DAC's firmware would seem to be required, but let's have MC share his thoughts.    I KNOW your Gear is operating well...don't sweat it!

Best!

Curt

Vintage 2018 ADI-2 DAC. "Classic AKM4490 Edition"
Cables:  Red, and White Ones.
Speakers:  Yes
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Re: Bit test: how to test 48 kHz flow?

Hi Curt!
Yes, I don't have any real issue, and my forehead is dry, don't worry!
It's just "intellectual curiosity". And if that need a firmware update, t's not worth it!

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4 Reply by MC

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Re: Bit test: how to test 48 kHz flow?

Use an editor and change the header to say 48 kHz. That's all. The files will be played a bit quicker, but that won't disturb the hardware detection, as it counts the samples in-between, and that is not changed by 'speed'.

Regards
Matthias Carstens
RME

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Re: Bit test: how to test 48 kHz flow?

MC wrote:

Use an editor and change the header to say 48 kHz. That's all. The files will be played a bit quicker, but that won't disturb the hardware detection, as it counts the samples in-between, and that is not changed by 'speed'.

OK MC, thanks a lot smile

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Re: Bit test: how to test 48 kHz flow?

Forgive me, I don't know English very well and I don't quite understand the bit test.
Does my file sound different, is there something wrong ??

The 192/24 file sounds different than the 192/32 and 44/16 files. Is it normal ??
I checked on several different players ??

I apologize for the translator.

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Re: Bit test: how to test 48 kHz flow?

1987maszynista wrote:

Forgive me, I don't know English very well and I don't quite understand the bit test.
Does my file sound different, is there something wrong ??

The 192/24 file sounds different than the 192/32 and 44/16 files. Is it normal ??
I checked on several different players ??

I apologize for the translator.

The sound is not relevant.
Only thing that is relevant is the display message at the device "xx Bit Test passed".

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Re: Bit test: how to test 48 kHz flow?

1987maszynista wrote:

Forgive me, I don't know English very well and I don't quite understand the bit test.
Does my file sound different, is there something wrong ??

The 192/24 file sounds different than the 192/32 and 44/16 files. Is it normal ??
I checked on several different players ??

I apologize for the translator.

Don't bother with the sound: just check the ADI screen: if you can see the label "Bit Test passed", it's OK. If you can't see this text, the Bit test failed.
See ADI-2 DAC manual on page 65 smile

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Re: Bit test: how to test 48 kHz flow?

Thank you !

10 Reply by N00b (edited by N00b 2020-03-05 10:50:37)

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Re: Bit test: how to test 48 kHz flow?

MC wrote:

Use an editor and change the header to say 48 kHz. That's all. The files will be played a bit quicker, but that won't disturb the hardware detection, as it counts the samples in-between, and that is not changed by 'speed'.

Hi!
I've done this and it works, thanks! (My first time editing the header of an audio file, fun!)

If someone wants the 48 kHz file, I can send it smile

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  • Registered: 2020-04-13
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Re: Bit test: how to test 48 kHz flow?

N00b wrote:
MC wrote:

Use an editor and change the header to say 48 kHz. That's all. The files will be played a bit quicker, but that won't disturb the hardware detection, as it counts the samples in-between, and that is not changed by 'speed'.

Hi!
I've done this and it works, thanks! (My first time editing the header of an audio file, fun!)

If someone wants the 48 kHz file, I can send it smile

Thanks. I did it too.

To do, open 96khz files with a Hex editor. And find & replace.

96khz 16 bit :
666D7420 10000000 01000200 00770100 00DC0500 04001000

==> 48khz 16 bit :
666D7420 10000000 01000200 80BB0000 00EE0200 04001000


96khz 24 bit :
666D7420 10000000 01000200 00770100 00CA0800 06001800

==> 48khz 16 bit :
666D7420 10000000 01000200 80BB0000 00650400 06001800


96khz 32 bit :
666D7420 10000000 01000200 00770100 00B80B00 08002000

==> 48khz 32 bit :
666D7420 10000000 01000200 80BB0000 00DC0500 08002000

that's it. enjoy.