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audiofool

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  1. I have a cheap Topping DX1. It sounds better with DSD input but impossible to tell if it is bit-perfect. It is very stable with pcm/dsd/sample rate changes. 48x DSD rates even work if you run 44x DSD first BUT will output full volume noise if you run pcm first!! - a dangerous bug!
  2. @miska Have you had time to test the Topping HS02 isolator with a rpi4? I hear a difference between the usb3 and usb2 ports on the rpi4, do you know which one is technically better? The usb3 port sounds brighter, but maybe that is noise or some sort of interaction with the buggy xmos chips? Also, on the rpi4 there is software available to shut the ports down - once again sounds different with the unused ports disabled. Hoping an usb isolator will lessen some of the differences. Thanks
  3. audiofool

    HQ Player

    I had emailed Topping a couple months ago about the power capabilities of the HS02 for use with a usb powered Topping DX1. The DX1 doesn't draw much power so they said it would work, but still recommended external power supply for the HS02. RME tested the HS02 and said it uses a Mornsun DC/DC converter with about 1nF of coupling compared to the Intona at 10 pf coupling. I'm not sure if the Mornsun converter is bypassed with an external supply. RME also tested the Hifime USB Isolator V2 2023 - provides 500ma with 71pf coupling. Not sure I like the unshielded plastic case though.
  4. I also have a cheap Topping DX1 with the same issue, both Altset1 and 2 have the same S32_LE format but the 2nd one is 24bit. The interesting thing is that hqplayer embedded (older version) works fine and shows 32 bit using NAA but is limited to 24 bit when directly connected. Never noticed before since mostly using SDM and NAA. Will send Topping an email but I doubt they will fix it. Out of curiosity is it possible to override the format name or disable Altset 2 maybe with something like: modprobe -r snd_usb_audio modprobe snd_usb_audio "quirk_disable=Altset2" ????
  5. audiofool

    HQ Player

    I was thinking specifically for 16-bit sources. In the case where a cd master is truncated to 16 bits instead of dithered - I guess once the damage is done...
  6. audiofool

    HQ Player

    A Dither Question: Would there be any advantage or disadvantage to re-dither 44/16 cd source before processing with hqplayer to sdm output? My thinking is similar to using apodizing filters to fix issues, maybe adding dither is good in some cases?
  7. audiofool

    HQ Player

    Sounds like there is still some interaction between the source and the isolator and/or the isolator and some dacs. I was hoping that the isolator would eliminate all issues with the source. I understand that the Innota has considerably sophisticated software to work as well as it does. I may try the TI isolator since it seems they developed a chip for the specific purpose. I personally find that usb cables, source usb port choice and even alsa buffer settings make a difference.
  8. audiofool

    HQ Player

    I guess my question really is how perfect are the isolators, for example, if you use something like an rpi4 or a very good server with gigabyte premium usb ports once they go through say the 7055-C can you tell the difference between the rpi and the server?
  9. audiofool

    HQ Player

    Has anyone tried the TI isolator ISOUSB211DPEVM - needs a case but looks easy enough and much cheaper than Intona? @Miska - do you find the Intona directly connected to your server equal to NAA in sound quality and measurements?
  10. There are some DAC that allow dsd bypass mode but lots that don't. Some dac like models for Fiio that convert dsd to pcm in the XMOS. Even RME AKM model disables the headphone jack for safety reasons when using dsd bypass mode, etc.... Without measuring it is very difficult to know what is going on. Using hqplayer I can use bypass mode in some dacs and maybe keep at least as dsd with akm chips but it would be nice to be able to modify the firmware. Just wondering if anyone has attempted it on retail products.
  11. What is frustrating are the terrible decisions being made regarding DSD modes, filter modes, decisions to upsample in XMOS, add dither, etc...... Is it possible to modify or replace the stock XMOS firmware in Topping, Fiio, etc dacs using AKM dacs? If not maybe it is time to build something :)
  12. After some more comparisons I still hear a difference between having 2 pipelines defined vs 9, the difference is there for both flac, wav and dsf stereo files. I have commented in the past about a difference between flac vs wav that was throwing me off with this. I don't notice any sound difference between wv and dsf files but wv doesn't seem to ff or rewind using hqp-control2. Here is what I used: poly-sinc-ext2 LNS15 705600/32/2 <matrix enabled="1" engine="1" expand_hf="0"> <pipeline channel="0" gain="-11.5" mixdown="0" process="/tmp/hqplayer-eq.txt" source="0"/> <pipeline channel="1" gain="-11.5" mixdown="1" process="/tmp/hqplayer-eq.txt" source="1"/> <pipeline channel="2" gain="-14.5" mixdown="0" process="/tmp/hqplayer-eq.txt" source="2"/> <pipeline channel="3" gain="-14.5" mixdown="1" process="/tmp/hqplayer-eq.txt" source="2"/> <pipeline channel="4" gain="-14.5" mixdown="0" process="/tmp/hqplayer-eq.txt" source="3"/> <pipeline channel="5" gain="-14.5" mixdown="1" process="/tmp/hqplayer-eq.txt" source="3"/> <pipeline channel="6" gain="-8.8" mixdown="0" process="/tmp/hqplayer-eq.txt" source="4"/> <pipeline channel="7" gain="-8.8" mixdown="1" process="/tmp/hqplayer-eq.txt" source="5"/> <pipeline channel="8" gain="-8.8" mixdown="0" process="/tmp/hqplayer-eq.txt" source="6"/> <pipeline channel="9" gain="-8.8" mixdown="1" process="/tmp/hqplayer-eq.txt" source="7"/> <pipeline channel="10" gain="0.00" mixdown="10" process="" source="10"/> Here is some of the eq file, I have up to 12db of gain at some frequencies: Filter 9: ON PK Fc 200 Hz Gain 2.5 dB Q 5.000 Filter 10: ON PK Fc 250 Hz Gain 1.8 dB Q 5.000 Filter 11: ON PK Fc 310 Hz Gain 2.5 dB Q 5.000 Filter 12: ON PK Fc 400 Hz Gain 0.5 dB Q 5.000 Filter 13: ON PK Fc 500 Hz Gain 0.0 dB Q 5.000 Filter 14: ON PK Fc 630 Hz Gain -2.5 dB Q 5.000 Also, what is the difference between sdm-pcm standard and High order filters - I like the High Order best. Hopefully there is an explanation besides me going crazy.. Thanks again
  13. One other note, these are 2 channel 44khz 16 bit wav files not flac as I thought, I wonder if the lack of channel layout unlike flac (ie. L R) is an issue?
  14. Makes sense. So nothing I do with the other pipeline definitions should have any influence on 2 channel files?
  15. <pipeline channel="6" gain="-6.8" mixdown="0" process="/tmp/hqplayer-eq.txt" source="4"/> <pipeline channel="7" gain="-11.6" mixdown="1" process="/tmp/hqplayer-eq.txt" source="4"/> <pipeline channel="8" gain="-11.6" mixdown="0" process="/tmp/hqplayer-eq.txt" source="5"/> <pipeline channel="9" gain="-6.8" mixdown="1" process="/tmp/hqplayer-eq.txt" source="5"/> <pipeline channel="10" gain="-6.8" mixdown="0" process="/tmp/hqplayer-eq.txt" source="6"/> <pipeline channel="11" gain="-11.6" mixdown="1" process="/tmp/hqplayer-eq.txt" source="6"/> <pipeline channel="12" gain="-11.6" mixdown="0" process="/tmp/hqplayer-eq.txt" source="7"/> <pipeline channel="13" gain="-6.8" mixdown="1" process="/tmp/hqplayer-eq.txt" source="7"/> I was on 4.21 before, but I may not have noticed before. The above matrix is something I was playing with based on one of the examples in RFC 7845 Section 5.1.1.5 and I expected some sort of reverb because of the mixing of the surround channels. It's with 2 channel that I notice a difference between having an eq filter defined for only 2 channels or having a multichannel config. I am assuming the hqplayer ignores the additional channels if the source only has 2 channels? I have simply been deleting channels 2 to 9 when testing - maybe they have to be there? I also tried the following matrix with the same result with 2 channel audio - it's subtle but sounds slightly wetter for lack of a better description. <pipeline channel="0" gain="-11.5" mixdown="0" process="/tmp/hqplayer-eq.txt" source="0"/> <pipeline channel="1" gain="-11.5" mixdown="1" process="/tmp/hqplayer-eq.txt" source="1"/> <pipeline channel="2" gain="-14.5" mixdown="0" process="/tmp/hqplayer-eq.txt" source="2"/> <pipeline channel="3" gain="-14.5" mixdown="1" process="/tmp/hqplayer-eq.txt" source="2"/> <pipeline channel="4" gain="-14.5" mixdown="0" process="/tmp/hqplayer-eq.txt" source="3"/> <pipeline channel="5" gain="-14.5" mixdown="1" process="/tmp/hqplayer-eq.txt" source="3"/> <pipeline channel="6" gain="-8.8" mixdown="0" process="/tmp/hqplayer-eq.txt" source="4"/> <pipeline channel="7" gain="-8.8" mixdown="1" process="/tmp/hqplayer-eq.txt" source="5"/> <pipeline channel="8" gain="-8.8" mixdown="0" process="/tmp/hqplayer-eq.txt" source="6"/> <pipeline channel="9" gain="-8.8" mixdown="1" process="/tmp/hqplayer-eq.txt" source="7"/>
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