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In Reply to: RE: " This is noise generated by the computer, not by the power supply itself. " posted by beppe61 on December 23, 2014 at 03:33:48
Maybe you should look at another platform if your aim is to get low noise, a very good aim of course. Noise is not music.I don't think you understand. I don't listen to the power supply. The 'noise' is what you see on the power supply DC due to large variation in switching current demands made by the computer. Any working computer will have the same effect on the power supplies under test. If the power supplies were unable to tolerate those variations, the computer simply would not work or be unstable.
The bottom line test is, do you hear the effects of the different power supplies out the DAC and through the rest of the system when playing music.
If the concern is for that 'noise' getting back into the AC mains, that can be cured with a decent power conditioner before the power supply.... whether that power supply is a switcher or a linear supply.
The battery is completely isolated so in this case, there is no concern for that 'noise' being conducted thru the battery and into the AC mains.
Edits: 12/23/14Follow Ups:
Hi Mr. Collins and thanks for your reply
Let me see if i understand
1) a computer is a tough load for a PS. Am i right ?
2) nevertheless it must be seen if this ps noise is in someway audible at the dac outsTherefore my question is ... why to use a pc ?
Better ... is the pc really the most sensible approach to reproduce audio ?
Maybe the "streamers party" is right
A streamer looks to me a dedicated, stripped/slimmed down pc without any other purpose. Designed exactly only for audio.
For me your measurements reinforce the streamer option.
I am completely sure that a streamer is a very easy load without all these peakes and noises.
Moreover what keeps even some cheap streamers out of the game is the lack of specific drivers for Android of many high quality usb dacs.
But this could change quite soon ... there is an unbelievable "push" towards the use of Android devices.
Thanks a lot.
Kind regards,
bg
Edits: 12/23/14 12/23/14 12/23/14 12/23/14 12/23/14 12/23/14
1) a computer is a tough load for a PS. Am i right ?
No. The computer is not a tough load for the PS at all. Millions of computers are happily working fine 24/hours a day for many years on their lazy power supplies. ;-) My computer is usually ON 24/7 with no power supply 'strain' at all.
2) nevertheless it must be seen if this ps noise is in someway audible at the dac outs.
True, but the most prominent noise in question is not PS noise.... it is computer noise on the PS DC output.
Therefore my question is ... why to use a pc ?
Flexibility is just one of many reasons.
Better ... is the pc really the most sensible approach to reproduce audio ?
Depends on what you want to accomplish. Vinyl is the most sensible approach to some. Do you like organizing thousands of heavy records on shelves in your listening room? Do you enjoy cleaning records, getting up to change sides, lifting the tonearm to jump to a different track? If so, then vinyl might be the most sensible approach for you.
Maybe the "streamers party" is right. A streamer looks to me a dedicated, stripped/slimmed down pc without any other purpose.
Yes, it is a proprietary little black box that you are mostly dependent on the manufacturer to maintain and update if they're still in business a a couple years after you bought your streamer. If technology changes rapidly and software / firmware updates are no longer sufficient, you then have an obsolete and mostly worthless little black box.... unless the manufacturer is willing to swap out parts of the innards, most likely for a fee.
Plus, you still need a PC anyway. How else would you 'rip' those files for the streamer to play? How else would you get those ripped files to disk or USB thumb drive for the streamer to play? If you used a NAS, how would you get those files to your NAS? You probably already own a perfectly capable PC. Now just add a DAC.
Designed exactly only for audio. For me your measurements reinforce the streamer option.
No they don't. Have you measured any streamers lately? How do their measurements compare? How would my measurements directly relate to audio as we hear it from our speakers? That is the question. I was not measuring 'audio' or 'noise' at the speakers.
I am completely sure that a streamer is a very easy load without all these peaks and noises.
If you're completely sure of that, and completely sure that it matters, and completely sure that the streamer option is for you, then go buy a streamer.
Moreover what keeps even some cheap streamers out of the game is the lack of specific drivers for Android of many high quality usb dacs.
But this could change quite soon ... there is an unbelievable "push" towards the use of Android devices.
If you're talking about using your Android phone or tablet as your main audio source, good luck with that. The disadvantages have been thoroughly discussed several times in other threads. Just because it CAN be done doesn't mean it makes sense and SHOULD be done. Not for me!
Hi and messages received Mr. Collins and thanks for the very thorough explanation.
Only when i was telling of audio of course i was referring mainly to digital audio (i do not listen to LP these days)
now i shut up and wait for the listening tests results
Thanks again
Kind regards,
bg
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