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Old 28th January 2012, 09:08 AM   #411
acko is offline acko  Australia
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Default 9016 DAC AKD16

Quote:
Originally Posted by hochopeper View Post
That AKX sounds pretty handy!

I had a question about the upcoming AKD16. Is it a similar setup to the AKD18 but without the need for external IV stage? Will it be capable of handling similar multichannel i2s inputs? Is the IV on the pcb or integrated into the ES9016 chip? I'm looking to take i2s signal from a minidsp and trying to keep system complexity down a bit so integrated IV appeals to me. I will need 6ch for a 3way active setup.
The AKD16 series DAC based on 9016 chip will be offered with more integration like IV and controller on-board. (There is no IV on chip). The digital inputs are the same as 9018 DAC. At this stage 2CH is planned but 8CH version can be done if there is sufficient interest.
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Old 8th February 2012, 04:26 AM   #412
mcspack is offline mcspack  United States
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Hi Acko and all,

How would I go about connecting the ackodac in 4 channel quad mode? I have the 8 channel version. I will be connecting it to the exa transport via i2s. Also, as far as register settings, what are the optimal settings for my configuration? I want to run with the ASRC and oversampling on.

thanks,

Will
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Old 9th February 2012, 07:50 AM   #413
gillib is offline gillib  Austria
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Crossposting:

I just finished my ackoDAC with tube out:

Buffalo III DAC Tube Output Stage

Bruno
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Old 9th February 2012, 12:22 PM   #414
qusp is offline qusp  Australia
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nice work gillib! good to see another ackodac out in the wild
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Old 9th February 2012, 07:41 PM   #415
acko is offline acko  Australia
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Quote:
Originally Posted by gillib View Post
Crossposting:

I just finished my ackoDAC with tube out:

Buffalo III DAC Tube Output Stage

Bruno
Hi Bruno,

Thanks for sharing. fantastic effort!. If I am not mistaken this DAC board is a special build with a 9018 chip instead with outputs combined in stereo.

Also, looking closely your SDATA from transport goes to only one input of the DAC. The original manual indicated just this but I have since update manual as below:

"Stereo PCM I2S sources have 3 signals, Bit Clock, Word Clock and DATA. The Bit Clock (BCK) goes to 'CK', Word Clock (LRCK) to D1 and DATA to D2, D3, D4, D5 of the Digital Inputs of this DAC module."

So you are loosing dynamic range and output level with only one input connected.

Sorry I did not update you on this but I did post on the above sometime back.
Will send you the updated manual.
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Old 10th February 2012, 12:36 AM   #416
glt is offline glt  United States
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Quote:
Originally Posted by acko View Post
Hi Bruno,

...
Also, looking closely your SDATA from transport goes to only one input of the DAC. The original manual indicated just this but I have since update manual as below:

"Stereo PCM I2S sources have 3 signals, Bit Clock, Word Clock and DATA. The Bit Clock (BCK) goes to 'CK', Word Clock (LRCK) to D1 and DATA to D2, D3, D4, D5 of the Digital Inputs of this DAC module."

So you are loosing dynamic range and output level with only one input connected.

...
Or you could try setting the quantizer to 9bit (which also enables internal source sharing)
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Old 10th February 2012, 04:01 AM   #417
acko is offline acko  Australia
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Quote:
Originally Posted by glt View Post
Or you could try setting the quantizer to 9bit (which also enables internal source sharing)
Of course, yes, the undocumented feature of the 9018/12 Sabre chips. Thanks GLT.
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Old 10th February 2012, 05:46 AM   #418
gillib is offline gillib  Austria
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@acko and glt
Thank You for Your precious information. I will change that.

Special thanks to glt for his work concerning the Sabre DAC, his homepage is extreme valuable.

Bruno
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Old 10th February 2012, 07:21 AM   #419
mcspack is offline mcspack  United States
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Hi GLT,

How would I set the register for 8bit quatization, as that is the way I would like to implement my quad set up. This sets up register 15, but how does this differ-compare to the reg 14 setting that is documented for ackodac? Do both of these give me the input sharing? Can I use one or the other or both? Does quatization also give me better noise characteristics? I would then combine the outputs 1,3 2,4 5,7 6,8 ?

thanks,

Will
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Old 10th February 2012, 04:22 PM   #420
glt is offline glt  United States
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Quote:
Originally Posted by mcspack View Post
Hi GLT,

How would I set the register for 8bit quatization, as that is the way I would like to implement my quad set up. This sets up register 15, but how does this differ-compare to the reg 14 setting that is documented for ackodac? Do both of these give me the input sharing? Can I use one or the other or both? Does quatization also give me better noise characteristics? I would then combine the outputs 1,3 2,4 5,7 6,8 ?

thanks,

Will
You can find the settings for the quantization here: Sabre32 H i F i D U I N O
Quantizer is reg15
Rerouting is reg14

Both will result in using 1/2 the inputs, but only 8 bit quantizer will turn off 1/2 of the internal digital logic. This "lowers out of band noise".

You can do both with no harm

You can read more here: Sabre32: Effect of Quantizer Setting H i F i D U I N O

PS: I don't claim to know the theory of what is going on internally. Just collecting and passing along what others have said and when I can, I test it too :-)
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