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I hope this has not been discussed before - search did not bring up useful information.... I need your help - I'm starting to get into deep and terribly unknown water. I am planning on changing/upgrading my computer to something new(er), maybe back to something sophisticated/built by me instead of my current Off-The-Shelf Mac Mini. I am running a NAD M51 via USB from the mentioned Computer. A week or two ago I taped the 5v pin on my USB cable and confirmed to myself that the NAD M51 is properly running without the 5v line being connected to a computer. Neither for start/handshake nor playing. That is good! As per Data sheet the NAD M51 is asynchronous, just as a reminder/info. Now, This got me thinking - I know, mostly that's dangerous ;-) I can perfectly relate to the technical aspects that besides proper 5v power to a USB receiver and grounding issues there is also ripple and signal quality on the data lines to be concerned about. And, for systems depending on the senders clock accuracy, the USB Clock. These aspects have been put into place by several products. Example SotM USB Card: -Possibility of proper 5v power -Good (assumption - type/brand unknown) USB clock -Filters on PCI-E connection -Filters and good regulation for used components Since the NAD M51 obviously does not need 5v from the USB bus, and, since it is running in asynchronous mode, does a "specialty" USB card like SotM or PPA even improve something? If I interpreted all the schemas and design documents correctly, then I think not. Same question goes for devices like iFi iUSB Power and similar. Concerning the USB cards this also extends to linear PSU or battery PSU as further optimization. Conclusion / long story short: In respect to my setup - Computer connected to NAD M51 via USB whose 5v line has been completely blocked - do any of the well known sophisticated USB cards/addons and devices deliver better/cleaner signal or other improvements compared to simple on-board USB connections? And if so, could I ask you to explain why? Thanks in advance - let's rumble ;-)
hsitas posted a topic in Networking, Networked Audio, and StreamingI am looking for an extremely low jitter source (under USD 2000) to stream digital output over sPDIF or AES/EBU to my NAD M51 DAC. Colorfly Pocket HiFi C4 Pro seems to be a good option because of it 2ps jitter at its sPDIF output. Has anyone used Colorfly C4 Pro as a digital source in their audio system? NAD M50 seems to be a good option. What is the jitter on the NAD M50 Digital Streamer? Please let me know your experiences.
hsitas posted a topic in DAC - Digital to Analog ConversionI am considering the following converters for the NAD M51 Direct Digital DAC: (1) Audiophilleo 2 +PurePower (2) Bel Canto uLink + ifi iUSB Power (3) Bel Canto RefLink (4) JKSPDIF MK3 Which is the best ‘USB to SPDIF converter’ for the NAD M51 Direct Digital DAC? Does the XLR-AES/EBU digital audio input sound better than the SPDIF-Coaxial digital audio input on NAD M51? Does the Balanced (XLR) output sound better than the Unbalanced (RCA) output in NAD M51?
autyharley posted a topic in DAC - Digital to Analog ConversionSetup Source: Mac Mini i7 2.6ghz 2012 Decible 1.2.8 and Amarra 2.4.1 Dac: Via USB (old printer cable - new one in the post to try as I don't think this will cause this) Nad M51. Amps: Rotel RHA-10 Rotel RHB-10x2 Bi-amped Music: 96khz/24 bit flacs, 192khz/24 flacs, and standard rips. Problem: Playback at 96khz/24 bit is perfect but when I play or set the output to anything above, 176khz or 192khz I get a high pitch tone constantly in the back ground. It does not change with volume, just the frequency increasing. I am think it may also be there at 96khz but very quiet. My thoughts are that it could be a earthing issue? Doubt it would be cable interference? or poor quality of cable as it is from an old printer. Would it be safe in thinking that changing the frequency output, can alter the sound level of a earth loops noise?????? I tried different software, Amarra was hopeless at managing the outputs, but both made not difference to the "digital noise/earth hum???" Anyone had similar issues? Cheers Harley