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Shadders

Wammer
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Shadders last won the day on March 21

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About Shadders

  • Rank
    Experienced Wammer

Wigwam Info

  • Turn Table
    N/A
  • Tone Arm & Cartridge
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  • SUT / Phono Stage
    N/A
  • Digital Source 1
    Dune HD Base 3D
  • DAC
    Audiolab 8200AP
  • Integrated Amp
    CambAudio Azur 650
  • My Speakers
    DIY Transmission Lin
  • Trade Status
    I am not in the Hi-Fi trade

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  1. Hi, The clock is derived from the SPDIF datastream - encoding of the signal ensures that the clock can be recovered. https://en.wikipedia.org/wiki/AES3 States "AES3 allows the data to be run at any rate, and encoding the clock and the data together using biphase mark code (BMC). " Regards, Shadders.
  2. Hi, No, as my circle of friends are not hifi buffs. One has moved to a sound bar from Hifi components - as it is more convenient. But then, i am happy with my system, and don't pursue a new sound - except if it is speakers - as for myself, they are the only part of the audio chain that makes such a difference. As long as the amplifier is sufficient to drive the speakers - then i purchased the amplifier on specification. Regards, Shadders.
  3. Hi, Yes - i think the Chord does this - can someone confirm ? The buffer is essentially a FIFO - first in, first out, and this will ensure that there are no timing mismatches. It is the correct approach - but would take more design effort and hardware. The timing is not really an issue as the sending unit (CD player, or transport) should have the relevant high performance clock already - so the buffer/memory aspect is a guarantee, which could be marketed if implemented as a feature that other DAC's do not have. Regards, Shadders.
  4. Hi, Yes - for software - you can modify the algorithm as per what you prefer. I chose the Texas Instruments SRC4392 as it has a THD+N of -140dB at full scale input - which effectively is slightly worse than 24bit resolution. The IMD is at -160dB, which is excellent. TI certainly do make excellent products. Regards, Shadders.
  5. Hi, I specifically did not mention noise - as this has been shown as per Hifi News to be an issue for USB implemented DAC's and jitter. Whether you can hear it - is another matter. Again with the clocks - it is rather difficult to purchase a low performance crystal or clock oscillator. A 24.576MHz crystal from Euroquartz has at worst 15ppm frequency stability and cost 94p. So cheap for such a good device. Maybe people should engage in blind listening tests. As i said earlier in the thread - the DAC designers never state which opamp has been used and what type of analogue filter they have used neither. I did design my own DAC using the PCM1792, the best opamps, multiple regulation for each DAC IC, etc., 500femto-second jitter clock, SRC4392, and i could not determine the difference between my design and the Cambridge Audio DVD player using a Cirrus DAC IC. I now await the following : My system was not expensive enough My system was not resolving enough I am purposefully not hearing the difference I am deaf My design was wrong I did not use special components blah blah blah Regards, Shadders.
  6. Hi, Thanks - the DAC's that use ESS DAC IC's will have ASRC/SSRC as standard. Unless the DAC has a SRC IC implemented, then any DAC based on Analog Device, Cirrus Electronics, or Texas Instruments, will only oversample. The Benchmark reference - this is an old design - as it is based on an obsolete Analog Devices DAC IC. Their current Benchmark DAC's seem to use the ESS Technology IC's which have inbuilt ASRC/SSRC capability. In all of this - the designs which do oversample or upsample, will reduce any jitter considerably - so, should not be an issue for current designs. Regards, Shadders.
  7. Hi, Whatever the input (USB/SPDIF), the input signal to the DAC IC will be I2S : https://en.wikipedia.org/wiki/I²S The design is such that, it is not really possible to get it wrong. I have seen designs that use the XMOS USB interface that provides the I2S, and for SPDIF standard IC's are available (CS8416, DIR9001), that output I2S. Jitter and timing differences in clocks are not audible - if there is an issue between clocks - you will get an LSB bit error over minites, as opposed to many thousand per second to cause a persistent audible issue. Regards, Shadders.
  8. Hi, Do you have a list of which DAC's use ASRC ?. I would have thought it is a rarity, rather than the norm. Not really. There are off the shelf Digital Transmitters for audio (Cirrus, Texas Instruments) that are AES compliant. It is just not worth the bother to encode an I2S signal into AES signal using bespoke hardware - there is nothing to gain. As per the Archimago link in this thread, many of the crystals or oscillators are high performance for very little money. Regards, Shadders.
  9. Hi, Yes - which is what i have been saying. Regards, Shadders.
  10. Hi, Yes - the one used for D/A conversion. It could be of any order, and any filter type (Bessel, Butterworth, Checbychev, or any other), using any opamp, or could be a discrete transistor filter. Do DAC's from different manufacturers using the same DAC IC, sound different ? Manufacturers will in general, state the DAC IC used, but rarely state the output filter used, and the opamps used etc. If you examine DIYAudio, there are comments that even the same opamp in a different package (plastic, or metal can) sound different. Regards, Shadders.
  11. Hi, If we assume 100ps jitter on the receiving system master clock, and a 24bit 192kHz stereo signal which has a bit rate of 9.216MBits, then the variation of the receiving system master clock jitter is still 1,000x less than the incoming bit rate. As such, jitter is not an issue. Even anecdotally, we have to ask ourselves how does ethernet working at 10MBit/s and higher, work error free in the domestic environment ?. In addition, the error if it exists will affect any of the bits - so you will hear a definite degradation in sound - pops, clicks etc., as one bit error in the MSB will cause severe distortion. If you are not hearing pops, clicks etc, then there are no errors in the datastream. There may be an earting issue, if the equipment design is not sufficient to eliminate this aspect. Regards, Shadders.
  12. Hi, I was referring to the analogue filter - which will have a much more significant effect on the signal, than the DAC IC filter. Regards, Shadders.
  13. Hi, It is perhaps odd that the DAC manufacturer does not list the analogue filter that they use in the output stage of the DAC. Perhaps then, you could correlate a specific sound experienced with the filter type (Bessel, Butterworth, Chebyshev etc). Regards, Shadders.
  14. It is where you have had about 6+ lagers, gone to bed, and then wake up in the middle of the night, and take a really long p!ss. It is usually commented upon, on the duration of said p!ss.
  15. Hi, We should leave insects alone. They are an important part of the earths ecology. Regards, Shadders.