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Any info how it differs from the previous HD DAC?

 

I really liked sound of the HD DAC running with DSD128 input... ;)

 

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35 minutes ago, Miska said:

I really liked sound of the HD DAC running with DSD128 input... ;)

 

Andreas Koch design?

 

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This is what Rene wrote about the HD DAC X comparing it to the HD DAC

 

https://www.whatsbestforum.com/threads/nagra-hd-dac-with-classic-psu.26333/page-2

 

"The HD DAC X share the same New Digital board made in Switzerland by Nagra 72 Bit / 11.2 MHz. 8 core
Digital board, that also includ all the digital connections so it can be replace for future innovations. 

Both feature AES-EBU, S / P-DIF inputs are studied by Nagra, the new Nagra Link single-mode ST-1 optical inputs to receive in the near future, new sources of very high resolution Nagra.

Both have the USB input, around a 8-core X-Mos chip.
Ultra high precision and ultra low jitter clocks are used in this new Nagra DAC.
A high power FPGA performs all calculations; all audio sources are in DSD256 format (11.2 MHz sample rate).

The digital part alone uses 16 ultra low noise power supplies.
Some digital power supplies have noise levels 30 times lower than the HD-DAC, itself already using very low noise circuits. The order of magnitude of the noise of these new power supplies is 0.4 to 0.8 uV RMS (from 10 Hz to 100 kHz).

The 8-layer, high-précision PCB is also of very high précision.
The analog part is very original. The principles used within the Nagra HD-DAC have been taken over and improved.




Here some of the différence that the HDDAC X have :

Higher voltage, the power supply is very sophisticated, using ultra-fast silicon carbide rectifier diodes, ultra low-noise voltage regulators, and a virtual battery system made up of many supercaps. (3 times more than the HD-Preamp).

The new HD-DAC-X and its power supply use no less than 37 regulated power supplies. Also the Chassis is bigger so we can use larger capacitors.

The 8-layer, high-précision PCB is also of very high précision.
The analog part is very original. The principles used within the Nagra HD-DAC have been taken over and improved.

The impedance of the signals is strongly lowered by a symmetrical current amplifier, of very high performances, without voltage gain, without feedback.

The rise time is of the order of 1800 V / uS on the 28 H inductive load of the gain-up transformers.

The voltage gain is only achieved by new high-end audio transformers, studied by Nagra engineers. The other role of these transformers is to unbalance the audio signal to attack a single-ended tube mount. These transformers are built exclusively in Nagra workshops, by the best specialists.

The performance of these transformers is an important part of the audio quality of this new Nagra HD DAC X. Performance has been improved over transformers used in the old HD-DAC.

An impedance reduction is performed by a stage consisting of two military tubes NOS JAN5963, cathodyne output. The tensions of the heating filaments of the tubes are individually regulated by tube, by very low noise systems.

No feedback is used around this stage, as on the current amplifier preceding the audio transformers.

Numerous special components, some of which are custom-built on Nagra's specifications, are used within this new DAC.

Advanced mechanical isolation, the audio engineers created a super vibration free stand to lower the microphonic resonances to a new level. 


Rene Laflamme, Nagra audio"

 

 

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7 hours ago, Em2016 said:

Andreas Koch design?

 

Yeah, his design, AFAIK.

 

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Sounds like the new one is updated AK design with double the sampling rate (DSD256), like the recent Playback Designs DACs.

 

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8 minutes ago, Miska said:

Sounds like the new one is updated AK design with double the sampling rate (DSD256), like the recent Playback Designs DACs.

 

 

Yep looks like it's AK's 'money no object' design option.

 

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2 minutes ago, Em2016 said:

Yep looks like it's AK's 'money no object' design option.

 

I guess Playback Designs Merlot DAC is cheapest option to get that... Not knowing how much the Nagra costs, but assuming it will be quite a bit more expensive.

 

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8 minutes ago, Miska said:

 

I guess Playback Designs Merlot DAC is cheapest option to get that... Not knowing how much the Nagra costs, but assuming it will be quite a bit more expensive.

 

 

Agreed. There's also his Playback Designs 'Dream' DAC which sits in between, in price.

 

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What exactly does " S / P-DIF inputs are studied by Nagra" mean?

 

Did they improve upon the (claimed) problems of this interface?

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1 hour ago, AudioDoctor said:

 

Can you amortize it on taxes?

 

Of course!  You simply set up a business to sell/resell audio products.  Or to evaluate audio products.  Remember, you do not need to make a profit, only attempt to do so.  And besides the IRS is shut-down.

 

But - even better! - why not start your own religion.  Best tax scam going.  Call it... say... AudioScientology.

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1 hour ago, AudioDoctor said:

 

Can you amortize it on taxes?

Amortize? This is digital and it will devalue rapidly! I would hope it is a short schedule at least...

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4 minutes ago, Ralf11 said:

 

Of course!  You simply set up a business to sell/resell audio products.  Or to evaluate audio products.  Remember, you do not need to make a profit, only attempt to do so.  And besides the IRS is shut-down.

 

But - even better! - why not start your own religion.  Best tax scam going.  Call it... say... AudioScientology.

I take it you haven't owned a business then...

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6 minutes ago, Ralf11 said:

But - even better! - why not start your own religion.  Best tax scam going.  Call it... say... AudioScientology.

 

BRB, writing a book...

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