SOtM SMS-200

[Antoine]

Hifi_swlon is correct, feeding the LPS-1 with an LPSU will not make any difference to sound quality.  However, I do not think MCRU are confused at all, there have been plenty of folk on Computer Audiophile expressing a desire to feed the LPS-1 with a LPSU, MCRU sell LPSU's, the design is done, just advertise that the model with the correct power and voltage that is suitable for the LPS-1, and watch a few sales come in.  Of course there is the issue of eliminating 'wall warts' and SMPS power supplies, but to be honest, my house is stuffed full of wall warts, and last time I checked my 1000 Pro had two high powered SMPSU's lurking inside, I think you can worry about this stuff too much!  And in terms of 'gunge being fed into the mains', I can turn the Dev's up to +10dB, with wall warts everywhere, and hear nothing but total and utter silence.  (until I accidently hit 'play')

I actually made exactly this point about noise on the mains on another forum and actually stated that I could turn mine up to +30 dB and hear silence. Apparently the nasty insidious mains born noise doesn't actually appear until you play some music.... quite how it knows to start then I am unsure, possibly quantum entanglement or something simple like that


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The noise does start when you play music.

I was suspicious about this so I did a test a while back where I took a quiet track and made it massively quieter using audacity, then played it using optical, usb and air.

My silent pc via usb was quiet noisy, my raspberry Pi via usb was a lot quieter, and optical and air were very close to silent. This was tested at +20 with my ear almost touching the drivers.

In all cases when you press pause after a few seconds the noise stops as some form of digital mute kicks in.

The bolded part is exactly what happens. Most players 'free' the digital input when idle after some time. Roon for example does this after several seconds (can't remember the exact number). Before freeing the digital input 'digital silence' is fed to the input.

Also people think of noise as being 'one dimensional' and frequency independant but it's not. Different types of noise can cause different types of distortion in the final analog output signal, especially if this noise originates from the digital signal.