New Type of DAC

*Any* existing 24 bit DAC (theoretically 144db dynamic range) in existence (with (x1) company exception) has 'internal noise' that limits it to no better than about 120db dynamic range due to the noise floor.

If you look at the 'Bob Katz' review measurement comparison (between this 'Standard DAC' and the D-1) look at his figures 6 <-> 9 and read the text in that area, you will see that it has specs (min >150db, closer to +160db) that are many times better than any existing DAC.

I do not know what his 'standard DAC reference' is either...

The argument now could be made that since the best recorded dynamic range (theoretically 144db @24 bit) that has been recorded in the past (and now), why in the world would you want to spend the extra $$ for +150db dynamic range?

@sidewinder1 

How do you get on PF’s mailing list?  I searched their website and found nothing.  
Thanks!

Hi curiousjim,

Have no idea as to how to get on the PF mailing list.

I had simply found the PF link from someone else who was looking at the imersive D-1.

Interesting 

Something is spooky about D-1 published specs on DR and SNR of 168dB, which are significantly higher than any DAC in the market.  According to manufacture, D-1 has 10 volts line output, so it provides 22dBu max. signal level.  Here are its published specs:

• THD+N at 1kHz (22kHz BW):
  • 0.0002% at +22dBu
• THD+N at 20kHz (80kHz BW):
  • 0.0005% at +22dBu
• Dynamic Range:
  • 168dB (28-bits)
• Signal-to-Noise Ratio:
  • 168dB (28-bits)

At the full scale (22dBu), its THD+N is measured at 0.0002% (let’s take the best of the two).  Expressing that ratio to dB = 20 log(0.000002) = -114 dB.  Assuming its distortion is much much less than the signal (it got to be for a claimed audiophile grade DAC), the SNR = -THD+N = 114dB.  Assuming its noise/distortion measurements are correct, how can its DR and SNR be so high as 168dB which leads to 28 effective number of bits?

How can it be possible?  Can someone shed a light?