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ApplePi DAC -- Highest Performance Raspberry Pi DAC
ApplePi DAC -- Highest Performance Raspberry Pi DAC
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Old 17th April 2018, 09:26 AM   #21
terry22 is offline terry22
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Hi,
It looks like a very nice dac.
Is it able to play DSD Native or Dop?
If yes, which ones? 64/128/256?

Thank you for your answer
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Old 17th April 2018, 11:09 AM   #22
gazzagazza is offline gazzagazza  New Zealand
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Without the Kickstarter hype tell us more about why this is so good. Why the choice of DAC ChipSet? What special technical attributes does it have (and please, frequency response and THD tell us nothing). It seems quite expensive for what I see on the pcb.
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Old 17th April 2018, 11:16 AM   #23
doctormord is offline doctormord  Germany
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Whats the benefit of having 135dB DNR (dynamic range) if SNR (signal-noise-ratio) is "just" 128dB? Makes no sense to me.

I also wonder how you achieve 135dB DNR when the 1794A datasheet specs 132dB at best. Are all these specs from measured values? If yes, the measurement system is from great interest.

Last edited by doctormord; 17th April 2018 at 11:20 AM.
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Old 17th April 2018, 11:20 AM   #24
abraxalito is offline abraxalito  United Kingdom
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Looks to me that the 135dB DNR claim rests on a mis-interpretation of an FFT. Look here : ApplePi DAC - Highest Performance Rpi DAC Launched - DAC - Digital to Analog Conversion - Computer Audiophile

Eyeballing that plot seems to me to show a bin width around 30Hz - look at the width of the flat lines at the LF end.
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Old 17th April 2018, 05:06 PM   #25
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by gazzagazza View Post
Without the Kickstarter hype tell us more about why this is so good. Why the choice of DAC ChipSet? What special technical attributes does it have (and please, frequency response and THD tell us nothing). It seems quite expensive for what I see on the pcb.
The reasoning behind using the PCM1794 is the DAC DAC.

I am the designer of that DAC and the ApplePi DAC uses the same output circuits. Compare the price $1200 vs 175.

The DAC DAC sounds absolutely amazing. I wanted to reproduce the same sound for the Pi.

I recommend you to sign up for the ApplePi DAC tour here:
Introducing ApplePi DAC -- Highest Performance Raspberry Pi DAC

Once you hear it, I believe you will appreciate it.
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Old 17th April 2018, 05:38 PM   #26
orchardaudio is offline orchardaudio  United States
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Here are quotes from two of the people that participated in the tour so far:

"I highly suggest that folks sign up for the tour to hear this wonderful device.

I spent a good week listening to it and came away extremely impressed with what Leo has done with this DAC hat.

For anyone that is using a Squeezebox Touch or similar unit, they should find this to be an quite an upgrade.

I did compare it to a DAC I built with AK4990 DAC chip and Salas shunt regulators DIY modular DAC
I really could not pick one over the other. The sonic difference was completely dependent on the file being played. I feel both units are very transparent.

For under $250, the combination of a Rpi and the ApplePi DAC board is an outright bargain in today's audio world.

When it is released, I will be buying one."


and

"I have had the Apple Pie for a while and I must say I am really impressed.

I am also impressed with Leo or Orchard Audio. I had some issues with the Ethernet connection that we finally figured has to be my Comcast router. He spent almost two hours on the phone with me.

As all our work failed Leo packed up a Smarti Pi Touch with his DAC board. While this isn't the current tour setup I would hope that it is explored. This configuration would allow the listener to view the current play information with out a smart device. I personally like the set up as I have been hitting random on my music catalog. And it seems I do a lot more of "What is That".

Any way this is a dammed fine budget setup that punches way above it's weight.

I have had a couple friend over and they share my assessment.

I look forward to the finished product.

Alan."
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Old 17th April 2018, 05:42 PM   #27
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by terry22 View Post
Hi,
It looks like a very nice dac.
Is it able to play DSD Native or Dop?
If yes, which ones? 64/128/256?

Thank you for your answer
This DAC supports PCM up to 24-bit and 192kHz

The Raspberry Pi will automatically convert to one of the supported bitrates.

Last edited by orchardaudio; 17th April 2018 at 05:44 PM.
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Old 17th April 2018, 07:59 PM   #28
orchardaudio is offline orchardaudio  United States
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Quote:
Originally Posted by abraxalito View Post
Looks to me that the 135dB DNR claim rests on a mis-interpretation of an FFT. Look here : ApplePi DAC - Highest Performance Rpi DAC Launched - DAC - Digital to Analog Conversion - Computer Audiophile

Eyeballing that plot seems to me to show a bin width around 30Hz - look at the width of the flat lines at the LF end.
I am sorry for any mis-information, I have reviewed all of the measurement data that I have received and I do not know how the third party came up with a dynamic range of 135dB.

In the future I will have to review all data more carefully.

All other measurements are correct.

See attached plots.
1. THD+N vs amplitude
2. THD+N vs frequency (0dBFS 1kHz)
3. Frequncy Response (0dBFS 1kHz)
4. SNR
Attached Images
File Type: jpg FB_IMG_1521806950307.jpg (77.7 KB, 274 views)
File Type: jpg FB_IMG_1521806961897.jpg (64.8 KB, 272 views)
File Type: jpg FB_IMG_1521806977728.jpg (69.5 KB, 271 views)
File Type: jpg a6891057b0f19adb74544160df0015fe_original.jpg (61.6 KB, 271 views)

Last edited by orchardaudio; 17th April 2018 at 08:06 PM.
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Old 17th April 2018, 08:25 PM   #29
terry22 is offline terry22
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Quote:
Originally Posted by orchardaudio View Post
This DAC supports PCM up to 24-bit and 192kHz

The Raspberry Pi will automatically convert to one of the supported bitrates.
ok.
thanx
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Old 17th April 2018, 10:27 PM   #30
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by abraxalito View Post
Looks to me that the 135dB DNR claim rests on a mis-interpretation of an FFT. Look here : ApplePi DAC - Highest Performance Rpi DAC Launched - DAC - Digital to Analog Conversion - Computer Audiophile

Eyeballing that plot seems to me to show a bin width around 30Hz - look at the width of the flat lines at the LF end.
Thanks mate.

@orchadaudio

Thanks for clarification.
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