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About Music2496

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  1. Music2496


    Brilliant stuff KRSDarwin. I thought those free 5.1 samples would be the best way to easily test your earlier theory that you were maybe just playing 2-channel stuff before. Looks like you were right. Quite a few 2L recordings have been nominated for Grammy Award for Best Surround Sound. Search for "Lindberg" here: https://en.wikipedia.org/wiki/Grammy_Award_for_Best_Surround_Sound_Album Some of that style of music isn't normally what I listen to, but I really like "Quiet Winter Night" by The Hoff Ensemble, nominated for Best Surround Album in 2013 and available for purchase in 5.1. Happy to have helped.
  2. Music2496


    Hi KRSDarwin There's some free 5.1 samples available from here: http://www.2l.no/hires/ Can you try that to confirm everything is working well?
  3. Music2496


  4. All noted. However on the topic of DAC design, everyone should check out the late Charles Hansen post (one of the most respected qualified experts in DAC, A-to-D converters and amp designs, in both pro and HiFi worlds). https://www.computeraudiophile.com/forums/topic/35106-how-does-a-perfect-dac-analog-signal-look-different-than-a-cheap-dac/?page=7&tab=comments#comment-713189 It’s worth a careful read a couple of times over and bookmarking for future reference. His points that analogue section and power supply section design can swamp differences between digital filters when comparing DACs, often gets missed in this fun hobby of ours.
  5. This datasheet doesn't say everything about how things are implemented in the Pro-Ject S2 DAC and in every DAC using this chip. I've had discussions with John Westlake the designer of this DAC 😉 Just like Benchmark, Auralic and Ayre Acoustics do things differently using ESS Sabre chips... ESS Sabre chips have always been a bit of a black box in some aspects. Anyway, more important is that feeding this DAC PCM768kHz moves all images very very high above audio band and removes a lot of the DSP to outside the chip (a source of RF and IMD). As Jussi explains Laako (HQPlayer) explains: "there are always images at multiples of the sampling rate. Higher the rate, higher those images go in frequency and further apart from each other." Moving the heavy lifting of WTA1 (which outputs PCM705kHz/768kHz) to outside Hugo2/Qutest/Hugo TT2/Dave is one of the biggest benefits the M-Scaler brings to these DACs. Connecting these dots (Rob Watts quotes):  1. M-Scaler outputs 16FS (PCM705/768kHz), by-passing Dave/HTT2/Hugo2/Qutest's WTA 1 filtering stage. 2. Rob Watts on his DACs WTA 1 filtering stage: "WTA 1 (getting to 16FS) uses 90% of the FPGA DSP, and most of the FPGA fabric." 3. Rob Watts on M-Scaler: "The RF noise that the FPGA generates is a nightmare; it's 12A of correlated current with large amounts of 2GHz noise. In the long term I would like to integrate an M scaler with a DAC; but I have not been able to figure out how to do it without it compromising sound quality." Similar thinking to feeding DACs maximum input sample rate, in this case PCM768kHz for the Pro-Ject S2 DAC. Jussi Laako (HQPlayer developer) has measured this DAC and it objectively measures best fed PCM768/DSD512, which both measure practically the same... As initially mentioned, it's a nice DAC, when fed PCM768k for comparing MQA with, say, very long, million tap, linear poly phase sinc filters. And a bunch of filters that fit 'in between' these two extremes, as Jussi explains.
  6. Again... a source? For the Pro-Ject S2 DAC specifically... I'm not talking about an Auralic DAC here...
  7. The way you have been comparing differences makes good sense technically because the digital filtering is the only variable. Your analogue electronics remains constant in these comparisons and that's very important if you want to subjectively conclude anything in comparing digital filters. But legend comparing MQA on the Pro-Ject S2 DAC against Qutest+M-Scaler throws in too many of the variables Charles Hansen describes above. Not to discount your experimenting @legend! I have an S2 DAC too. An interesting exercise with the excellent valued S2 DAC is to compare MQA on it vs feeding it PCM768kHz using different filters, thereby by-passing the internal oversampling... With HQPlayer I can feed the S2 DAC with a loooong linear phase 1 million tap poly phase sinc filter and compare with MQA which is on the other end of the spectrum (so to speak), as well as a bunch of filters in between these extremes... all 'on the fly'. Doing it this way keeps the analogue electronics constant and that's very important if you want to subjectively conclude anything in comparing digital filters.
  8. I shared this earlier - from one of the most respected DAC designers who obviously has a very good understanding of both the digital side AND the analogue side (he's designed DACs and ADCs and amps for the pro world and HiFi gear of course), the late Charles Hansen of Ayre Acoustics: https://www.computeraudiophile.com/forums/topic/35106-how-does-a-perfect-dac-analog-signal-look-different-than-a-cheap-dac/?page=7&tab=comments#comment-713189 Digital filters is down the list... not that the topic (like this thread) is not interesting. But for example legend has been comparing Qutest+M-Scaler against MQA on the Pro-Ject S2 DAC but it's not a fair comparison, comparing the different analogue section and power supply section designs of these DACs... even putting aside the price differences... As Charles Hansen described elsewhere but hints in the above post, these differences between DACs (different analogue section and power supply section designs) can swamp any differences in digital filter designs between the same DACs...
  9. Sure, happy to trade sources 😉 https://www.stereo.net.au/forums/topic/261591-extreme-filtering-software-upscaling/?do=findComment&comment=4060641 and https://www.stereo.net.au/forums/topic/260051-chord-hugo-m-scaler-discussion-and-impressions-thread/?do=findComment&comment=4053223
  10. Not sure if you're aware (many people aren't) but all of Rob's DAC's except Chord Dave decimate DSD... i.e the FPGA converts DSD to PCM internally... https://www.head-fi.org/threads/chord-electronics-hugo-2-the-official-thread.831345/page-651#post-13950774 With Chord Dave, there is DSD+ mode which plays DSD without decimation.
  11. Noted. I'm just giving some background to where his comments "somewhere in between the extremes" may come from... he considers what you consider, plus does measurements with real instruments and music... (per the link above)
  12. You are looking at things only from a digital filtering side... HQPlayer's developer looks at the digital filters side, plus analogue recordings/measurements perspective... https://audiophilestyle.com/forums/topic/49609-john-atkinson-yes-mqa-is-elegant/?do=findComment&comment=874422
  13. Interesting quote from HQPlayer's developer, Jussi Laako about this: "looked from two extremes, both Chord talking about transient accuracy with extremely long filters and MQA talking about transient accuracy with extremely short filters are both right in a way, but only looking at things from one point of view while ignoring others. As usual in life, truth is somewhere between the extremes..." https://audiophilestyle.com/forums/topic/49609-john-atkinson-yes-mqa-is-elegant/?do=findComment&comment=866897
  14. Music2496


    Ha no worries mate. But this particular thing came from personal experience though, 2 years ago (having been through every possible issue under the sun). Learnt a lot from the Roon Support guys directly... It's specifically the Roon Core that you should hardwire to the router. The endpoints are much less an issue over wireless. Happy to hear playback has been flawless. That's how music/Roon is meant to be enjoyed!