Reduce Output Noise and International SNR standard

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I agree with previous posters on their points. A "noisy" SMPS will usually result in all sorts of hash and spikes on the output and can take quite a bit of things to get rid of it. Good shielding - good grounds - and some good caps and a choke or two for starts. If you have a "hum" it is most likely lousy grounding - or perhaps ground loops or a crappy power trany. That's where I would be looking 1st.

As to SNR - well the higher the better but there is no "standard" to meet regarding audio gear. If you want a target to shoot for then aim for -130 or better as that will limit the noise floor for the rest of the rig.
 
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