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16
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: Hiss
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on: June 24, 2021, 03:06:34 pm
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It seems like the issue could be with my amp. If I unplug the RCA from the DAC, leaving only one end of the RCA connected to the amp, I have hiss.
If it is pugged back into the DAC and the DAC is off, no hiss. Once power is back on he DAC, the hiss returns.
I'll take another look at all the soldering and grounding in the amp and see if I can find the problem.
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17
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: Hiss
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on: June 23, 2021, 06:20:38 pm
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Hi Peter, No you can't hear any music but the hiss returns. So with switch 2 off, there is no hiss but if I play music from the computer, there is no sound but the hiss returns. Just like there is hiss all the time when switch 2 is on. Here is where I saw the idea- I did not find out what it signified though... I've got a 1KHz track recorded at 0dB FS. With the Sauermann monos I can still hear this track over the amp's (white) noise with XX set to -120dB! OK, that's with my ears right next to the 115dB horn. Haha. I didn't try any lower with the Sauermanns, but with the quiet channel of the BD amp, I can hear the tone with XX's vol set to -144dB!!! Weirdly, as the attenuation gets very high, the tone starts coming and going. At > -132dB attenuation, it seems to be riding on a 1-2Hz modulation. Now, I have no idea if XX's vol control is at fault here. Or maybe there's some sort of 'Nick effect' going on - the house is 130 years old, so ghosts can't be ruled out. Mani. Mani hi, That is the breakthrough suspected I2S de modulation noise I get as well. I can hear it with music playing at -144db vol particularly music with a strong beat. I also use a 0db 1khz tone teach for testing. I don't get the modulation that is interesting. Do you know what the gain is of you Sauremann amps are my bridged gainclones are about 36db IIRC. I wonder if amp gain it important. Regards, Nick. Ps hears another test try playing the music / test signal into the NOS with the NOS turned ON but with switch 2 turned OFF ( eg the DAC board not powered on). Can you hear anything ? |
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18
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Ultimate Audio Playback / Phasure NOS1 DAC / Re: Hiss
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on: June 23, 2021, 05:05:35 pm
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Hi Peter,
Dumb mistake. Instead of switch 4 it should be 2. There was some other thread I read about the noise level with number 2 switched off and music still playing. I just did not double check the numbering yesterday.
David
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19
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Ultimate Audio Playback / Phasure NOS1 DAC / Hiss
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on: June 22, 2021, 09:10:18 pm
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Hello All,
I have a new tube amp with La Scala speakers and have noticed a hum, which may have been there previously , but is now much more pronounced with this new setup.
With the amp volume all the way to 10 and the NOS1 switched off and connected by the RCA jacks, there is very little noise. The same is true if I use something other than the NOS1 to play music through the RCA jacks. Everything seems to work pretty quietly except for the NOS1.
If I turn on the NOS1 but leave switch 4 off, it is silent. If I play music with switch 4 off, the static hiss returns and is quite noticeable.
If the NOS1 is powered on and switch 4 is on, there is quite a bit of hiss without even playing music.
I have an older house and the electric outlets are only two wire, so no earth ground. I have plugged in only the amp and the NOS1 and tried a couple of different outlets but unfortunately, I always have the same hiss.
My plan is to re-run grounded outlets with a dedicated circuit but before that, does anyone have any suggestions for how to remove this hiss? I've ended up just turning the amp volume to about 2 o'clock to reduce the noise but I know that is not ideal in the long run.
Best,
David
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22
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Ultimate Audio Playback / XXHighEnd Support / Re: Tidal / MQA - Update - Heading 2.12
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on: June 14, 2021, 02:37:30 pm
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Hi Peter,
I noticed that one album with a blank, white MQA label on XXHighend plays at 48khz 24 bits, but that exact same album file on Roon is listed as FLAC 48khz 24 bit, MQA 96khz.
When played, it is decoded by Roon's MQA decoder at the 96khz rate. I don't know if this gives you any clue to what is going on though...
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23
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Ultimate Audio Playback / XXHighEnd Support / Re: Alt-D and Alt-U issue
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on: June 10, 2021, 02:44:19 pm
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Hello Peter,
I just found out that when I uncheck the "Show as Wallpaper", I have the issue with Alt-U stopping playback when in unattended and it is not possible for me to change the volume. With the box checked, both Alt-U and Alt-D work correctly.
Best,
David
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26
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Ultimate Audio Playback / XXHighEnd Support / Re: Alt-D and Alt-U issue
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on: June 06, 2021, 01:41:41 pm
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Good memory Peter. I found the threads and it seems to have been related to the NAS.
I never had trouble with displaying cover art from my NAS until I changed disks and went to a 2 disk RAID configuration. That may have been when my cover art stopped displaying.
It's not very important to me but I do miss seeing the track title and the volume.
Best,
David
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27
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Ultimate Audio Playback / XXHighEnd Support / Re: Alt-D and Alt-U issue
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on: June 05, 2021, 02:32:41 pm
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I went back to the 14393 base and and after rebooting, the alt-D and U started working correctly again. Now in 14393 RAM all is back to normal.
I found out that the wallpaper shows correctly if the tracks are WAV files but I get the black screen if they are FLAC. Both JPEGs seem to be similar and I can't figure out why it shows for one type of file and not another.
Thanks,
David
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29
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Ultimate Audio Playback / XXHighEnd Support / Re: Playback jumps to next track prematurely
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on: June 04, 2021, 02:51:21 pm
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These new unmarked MQA tracks would not play for me unless I unchecked the Decode MQA box. I have now just started deleting all the files on the first page of the folder structure - the MTT, MQA Data, ect. leaving only the stream folder.
This seems to work without issue now and the bit rate comes up at 24, 48000 and plays like a normal FLAC.
Best,
David
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30
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Ultimate Audio Playback / XXHighEnd Support / Alt-D and Alt-U issue
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on: June 04, 2021, 12:25:00 pm
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Hello Peter,
About a month or two ago, I lost the "Display Wallpaper" which now only shows a black screen in unattended. I also lost the Alt-u and Alt-d commands. Nothing happens in unattended when I press Alt-d and when I push Alt-U the music stops. I can return to the desktop with Ctrl Alt X though. I cannot remember what I was doing to cause this loss of these unattended commands.
I am using the Ram disk and now have all the same settings you have been using. I re-installed the XX over-patch to see if it would just replace a corrupt file or something but still no change.
Any ideas?
Best,
David
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