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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: RE: The higher sampling rate posted by Ugly on June 28, 2016 at 12:03:01:
The noise characteristics shown in the spectral analysis suggest SMPS interference being coupled into the analogue input either through the phono cable or the cables to the ADC or possibly an interaction with the phono stage power supply. I observed similar characteristics when playing with different phono stages. The ones using a SMPS exhibit the noise shown in the traces. My reference phono stage has a linear power supply and the noise spikes disappear. The use of Balanced/Starquad XLR improves things and limits the bandwidth of the noise. When using twin conductor shielded RCA cable to XLR (since the iFi only has unbalanced outputs), the noise bandwidth was wider.
My iFi Phono exhibited noise spikes around 20kHz. My MF M1-ViNL (unbalanced output) had spikes around 38kHz with the same wide spectral characteristic.
Noise spikes notwithstanding, they are shown to be at very low amplitude <-100dB so apart from being measurable, they won't be audible. With vinyl playback you would have to have a very state of the art rig to do much better than 75dB S/N for hum and noise (ref 0dBFS / 5cm/s). Typically you would be getting hum breakthrough at -60dB or higher (ref 0dBFS / 5cm/s).
In short, I wouldn't be too concerned about that review.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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Follow Ups
- Noise spikes likely SMPS related - flood2 06/28/1615:14:34 06/28/16 (5)
- RE: Noise spikes likely SMPS related - Ugly 07:32:37 06/29/16 (4)
- RE: Noise spikes likely SMPS related - flood2 20:57:38 06/29/16 (3)
- RE: Noise spikes likely SMPS related - Ugly 08:03:13 06/30/16 (2)
- "beautiful, warm, shiny sun ..." - texanater 08:52:38 06/30/16 (1)
- RE: "beautiful, warm, shiny sun ..." - Ugly 07:36:24 07/1/16 (0)
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