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Old 9th May 2009, 07:19 PM   #1
Sandor is offline Sandor  Italy
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Default Audio Synthesis DAX 2 at 24/96

I wonder whether my Audio Synthesis DAX 2 D/A converter is compatible with the 24/96 standard (24 bit at 96 KHz) or not, given the substitution of the CS8412 receiver with the CS8414 chip.

The DAX 2 uses a NPC SM5842 digital filter, a Pacific Microsonic PMD100 HDCD decoder and a Ultra Analog D20400 DAC.

Best regards.

Paul
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Old 9th May 2009, 07:40 PM   #2
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No, you would need to replace sm5842, pmd-100 and D020400.

While the 5842 and PMD-100 accept 24bit inputs they are limited to 55khz maximum sampling rate. The D020400 is 20bit and limited to 50khz sampling rate.


Paul
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Old 10th October 2011, 04:33 PM   #3
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Quote:
Originally Posted by spzzzzkt View Post
No, you would need to replace sm5842, pmd-100 and D020400.

While the 5842 and PMD-100 accept 24bit inputs they are limited to 55khz maximum sampling rate. The D020400 is 20bit and limited to 50khz sampling rate.


Paul
I know this is a little old but I beg to differ...

The datasheet I have for the D20400 states it can handle 400KHz... so a 20bit/400KHz dac.

Hey! I've only just realised why it's called the D 20 400 (because I wrongly had in my mind that it went to 384KHz)

From the datasheet:

Quote:
The DAC D20400 converts at rates up to 400KHz, thereby accommodating 8x oversampling applications
I am on a quest to modify my Manley/Lavardin DAC with D20400 to run it at 20/96 or even 20/192 or even 20/400. To me those last bits don't matter but compatability with all the high sample rate formats does..

I would grab another Manley/Lavardin DAC with the D20400 with both hands as it's so simply laid out and designed that it would be a dream to work on (just a shame it's in a 1u rack without much of a case to speak of).

Starting from scratch with D20400 would be another great option.
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Old 13th October 2011, 03:40 PM   #4
qusp is offline qusp  Australia
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to run at 384/400khz you would have to run in NOS mode
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Old 13th October 2011, 11:48 PM   #5
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Yeah - which has led me to a little bit of confusion thinking about receiver chips and digital filters to run with it.

When a modern DAC runs at 192KHz is it still say 8x oversampled so the chip is running at 1.5MHz or so or do they normally run in NOS or low oversample rates, 2x for example?

Are there NOS modes on a modern receiver like a CS8416?

I hear of people running Sabre chips at 24/384 (what the point is I don't know..) so are they running in a NOS mode or again do these modern chips run at MHz levels?

Another question for anyone reading this - can any 400KHz capable DAC convert DXD given the right decoder chip?

Right now for my D20400 project I'm looking for a receiver/filter set to as closely replace the Yamaha/NPC combo currently used in the Manley to enable up to at least 96KHz operation as a minimum.

I might start a thread instead...
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Old 14th October 2011, 06:02 AM   #6
qusp is offline qusp  Australia
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yeah the sabre is running internally at over 1.5MHz. 384khz is to be able to use some of the hi-res rips and recordings becoming available.
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Old 15th October 2011, 05:30 PM   #7
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Does anyone know of a drop in (or near enough) replacement for the Yamaha YM3623 receiver and NPC SM5842 filter? Or is the filter bypassed if I need NOS for higher rates with this D20400?
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Old 15th October 2011, 05:34 PM   #8
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Sandor: I've found this website which has drop in replacements for various things if you still have the DAX 2

http://www.audionautes.com/Altriprod...SE/digital.htm

May even answer my questions too..
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Old 16th October 2011, 12:45 AM   #9
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P.S. the replacements are Audio Tuning actually.
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