FiiO Q5, Flagship DAC/Amp, an Dual DAC, USB/Optical/Coaxial/Line in, share the same amp module with X7.
Sep 8, 2015 at 3:50 PM Post #226 of 3,173
I like "B." I also like the mechanical volume pot.
 
Sep 8, 2015 at 4:02 PM Post #227 of 3,173
OPTION A FTW!!!! :D





I'm kidding! I like option B.
 
Sep 9, 2015 at 1:15 PM Post #232 of 3,173
I currently have a Fiio E18 and I can't wait to upgrade to the Q5. I know whatever Fiio puts out will be HQ.

aka subbed
 
Sep 10, 2015 at 9:52 AM Post #233 of 3,173
I currently have a Fiio E18 and I can't wait to upgrade to the Q5. I know whatever Fiio puts out will be HQ.



aka subbed

 


It is too early to talk the ETA of Q5, but it may take 10 months to develop it.
 
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Sep 10, 2015 at 11:06 AM Post #234 of 3,173
  the original ESS9018 has 135 SNR
 
the ESS9018k2m has 127 SNR ...
 
 
so please put in the original ESS9018 !! that would rock!!


Hm, I wonder if this difference in 8 SNR will be audible to smb
biggrin.gif

Fiio, leave Sabre aside already and go with PCM 1702/1704
wink.gif

 
Sep 10, 2015 at 3:36 PM Post #237 of 3,173
You guys should ditch the pure delta-sigma DAC chips and implement something like the Advanced Segment architecture chips from T.I.  :)

Anyway, any official word yet on just how much output power the amp-module in this and the X7 will have?  Like, how much output into 32 ohms, or 300 ohms?  ANd what the output-impedance will be?
 
Sep 10, 2015 at 4:07 PM Post #238 of 3,173
You guys should ditch the pure delta-sigma DAC chips and implement something like the Advanced Segment architecture chips from T.I.  :)


Anyway, any official word yet on just how much output power the amp-module in this and the X7 will have?  Like, how much output into 32 ohms, or 300 ohms?  ANd what the output-impedance will be?


FiiO already uses the TI PCM1792A in the X5 and X5ii. The DAC chip is still all Delta-Sigma but with a multi level design to better deal with inherent noise from Delta-Sigma. Many DAC chips use a similar approach, and 'Advanced Segment' is just TI's name for the multi level D-S implementation they use.

From the PCM1792A white paper pdf:

http://www.ti.com/lit/ds/symlink/pcm1792a.pdf

"THEORY OF OPERATION
Current
Segment Analog Output DAC
Upper 6 Bits
MSB
and Lower 18 Bits
0–62 Level
0–4 Level
0–66
ICOB Decoder
Advanced DWA
Digital Input
24 Bits 8 fS
3rd-Order 5-Level Sigma-Delta

Figure 65. Advanced Segments DAC

The PCM1792A uses TI’s advanced segment DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter. The PCM1792A provides balanced current outputs.
Digital input data via the digital filter is separated into six upper bits and 18 lower bits. The six upper bits are converted to inverted complementary offset binary (ICOB) code. The lower 18 bits, associated with the MSB, are processed by a five-level third-order delta-sigma modulator operated at 64 fS by default. The 1 level of the modulator is equivalent to the 1 LSB of the ICOB code converter. The data groups processed in the ICOB converter and third-order delta-sigma modulator are summed together to an up to 66-level digital code, and then processed by data-weighted averaging (DWA) to reduce the noise produced by element mismatch. The data of up to 66 levels from the DWA is converted to an analog output in the differential-current segment section.
This architecture has overcome the various drawbacks of conventional multibit processing and also achieves excellent dynamic performance."
 
Sep 10, 2015 at 4:08 PM Post #239 of 3,173
FiiO already uses the TI PCM1792A in the X5 and X5ii. The DAC chip is still all Delta-Sigma but with a multi level design to better deal with inherent noise from Delta-Sigma. Many DAC chips use a similar approach, and 'Advanced Segment' is just TI's name for the multi level D-S implementation they use.

From the PCM1792A white paper pdf:

http://www.ti.com/lit/ds/symlink/pcm1792a.pdf


So then is there ANYTHING out there with a R-2R architecture, or at least partially R-2R architecture, that could be utilized in something like the Q5 or the X7?
 
Sep 10, 2015 at 4:09 PM Post #240 of 3,173
So then is there ANYTHING out there with a R-2R architecture, or at least partially R-2R architecture, that could be utilized in something like the Q5 or the X7?


Sure, but it would be expensive and inherently large.
 

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