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  1. Thanks Rajiv, If I remember correctly from another review, you had a clock that synchronized the SOTM and Uptone Audio network switches and a USB interface. Did you remove it after adding the Taiko server?
  2. I would like to know what is the lowest power CPU that can run HQPlayer at DSD 256 upsampling without any restriction on modulator or filter type. I tried to check the posts on the mac mini M1 and, while I understand it will do DSD 256, I am still not sure if it can keep up with all modulator and filter combinations. Also, is it correct that in case of using a MAC, an NAA may be required because MAC can only output DSD over PCM (and many DACs will not accept the sample rates required)? Has anybody tried the intel i7 "T" processors which run at a base frequency of 2.0Ghz for use with HQp
  3. I guess this means that we are better off looking for DACs that can do DSD256 without clock dividers rather than waiting for CPU technology to catch up with HQ Player's EC modulators DSD512 processing needs for real time playback. Because if we are lucky enough to get 20% increase in processing power every 2 years it is still going be a long wait (that's hoping for a new architecture every two years that can deliver at least 15% improvement and some minor improvement in between). May be if we get together we can commission T+A or Lampizator to build such a DAC 🙂 I am curious thou
  4. First , thanks to Audiophilestyle for this great opportunity. I have a few things that I am curious about: - Where does Bruno think class D is heading and where are the improvements going to come from? There are companies which now use gallium nitride transistors and are pushing the switching speed into the MHz region. Does Bruno think this is the way forward? - Class D has achieved very low levels of distortion, but is it possible for class D amplifiers to continue their evolution into something close to a straight wire with gain, i.e. minimal phase shift in the audio ba
  5. Interesting. I think this simple calculation sheds some light on the reported performance of various processor designs with the more strenuous HQPlayer algorithms. It makes sense not to waste many of those clock cycles over latency, hence the importance of cache size, or other unrelated processes, which is probably part of the reason, beside larger total cache size, that some processors with a large number of cores are reported to perform ok with HQPlayer's more difficult loads despite their lower clock speeds as they have more free cores to use. One question I have is whether t
  6. Hi, I would like to know if Miska or any HQ Player user have experience they can share about running 512x DSD upsampling on Ryzen, or Threadripper CPUs and whether there are any limitations on the upsampling filters that can be used in such a setup. I am considering building a PC around AMD's latest generation CPU's but I am a bit worried because they are behind Intel in terms of AVX implementation, though these CPUs sometimes seem to do quite well in compute tests.
  7. Quick but relevant question for Miska. Do you think if the upcoming E5 Skylake Xeons have AVX 512 instructions or a subset of the AVX512 instruction set enabled as expected, that would allow HQ player to required lower minimum base frequency requirement? My understanding is that AVX 512 should allow doubling the floating point operations executed per clock cycle.
  8. A detailed spec table was published in this recent anandtech article NVIDIA Posts Full GeForce GTX 1070 Specifications: 1920 CUDA Cores Boosting to 1.68GHz Apparently nvidia decided to deliberately cripple FP64 performance in Pascal consumer cards and limit it to 1/32 of the FP32 performance, i.e. the same ratio as Maxwell except that Maxwell did not have much FP64 hardware in its silicon to start with. I have been expecting this to happen and I have a strong feeling that the Quadro variant will be partially disabled as well, except may be for the most expensive ones. FP64 is a specializ
  9. Just a quick question, does HQ player support acceleration via Intel integrated GPUs?.
  10. I never found it clear how Lampizator does DSD conversion. Their website says "THE LAMPIZATOR DSD DAC HAS USB PORT BUILT IN, SOLID STATE DIGITAL FILTER, PASSIVE DISCRETE ANALOG FILTER AND ACTIVE DISCRETE TUBE FILTER. " Now, the only digital filter I have seen implemented for DSD in my limited knowledge is a "moving average" digital filter with different implementations. I understand it is built in the Burr Brown DAC chip which ifi uses, and is also implemented in Accuphase DACs via a combination of DSP and the multichannels of the ESS DAC chips. (Is this also the filter implemented in th
  11. Yes, they say they have developed their own 1-bit DAC and according to the available photos there are 4 of them inside the DAC8 DSD. It seems they follow a purist approach for their DSD processing inside the DAC. From the user guide: " In the past it has been standard practice to apply digital and analogue filtering processes in an attempt to reduce DSD noise, but such solutions are never entirely without side effects on sound quality. For the DAC 8 DSD we have developed two special techniques designed to eliminate the sonic disadvantages: 1. The True-DSD technique, consisting of a dir
  12. You touch upon a point that I have been curious about so I want to seek more clarification as I am not totally on top of what can be accomplished or corrected through DSP. I understand apodizing filters changes the occurrence of the ringing that a steep digital filter introduces from happening before an impulse to happening after an impluse and hence has the potential to sound more natural. But if that is correct, the blurring remains but is less offensive. Can the apodizing filters be tuned somehow to remove the ringing if the filter in the ADC is known? When you say you can not unfilter t
  13. Hello Miska, I am trying to plan a PC upgrade. I hope you can shed more light on how you expect GPU acceleration support in HQ Player to evolve. Do you expect nVidia GPU's only to be supported or is there a plan to also support ATI GPU's and Intel's own GPU's like the ones in Skylake processors? What is the minimum number of single/double precision Gflops in a GPU that would be adequate to run HQ player filters/modulators without limitations, say for converting everything up to 512Fs DSD.
  14. I hope you will making this product : range: micro / model: iUSB pro A USB re-generator that also acts as a USB hub and detects the incoming data stream and directs it based on its content. So, for example, if it is PCM, it goes to DAC#1 and if it is DSD or DSD encapsulated as PCM, it goes to DAC#2. Alternatively, if it is CD quality it goes to DAC#1, if it is high resolution or DSD, it goes to DAC#2. If that is the product, I hope both scenario's are implemented.
  15. Thanks for all who replied. I have a question for Blu. Does WAV sound better than other formats in both Audirvana and Pure Music. The reason I am asking is that Pure Music decompresses files before buffering them in memory and as such should level the playground between uncompressed and lossless-compressed formats. I guess I will buy a license for Pure Music and compare WAV to AIFF and Apple lossless in my setup.
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