Linear Power supplies for DACs...?

Just go near any SMP with a portable AM radio tuned down low in the dial somewhere 5-8 hundred kilohertz where it’s quite turn up the volume make sure it’s not auto muting and see the noise it put out when you wave it around an SMP.
And this is radiated RF, it penetrates everything bar a Faraday cage, then also add what’s going back through the mains wiring of the house.
Many amp manufactures that use SMP's in their better higher end models they have linear supplies in them, think why??

Cheers George

Don't neglect the DC cable. It's just as important. The Cerious Matrix DC cable provided a surprising boost in sound quality.

@c_avila1 , is the Cerious a custom cable? I don't see it on their website.
I don't know if there is a standard connection to a LPS, but the termination to the device is a standard 2.1mm.

I'll be sure to stay away from my wall warts with a portable transistor AM radio. I have a wall wart for a DVD player plugged in my panamax conditioner with my other stereo components never had a problem. Just use what comes with your DAC if you can actually hear it make noise then by all means replace it but replacing it with a linear with never hearing any noise doesn't make sense. 

Has anyone experience w/ linear power supply with Schiit Modi3 DAC?

According to one reviewer who gave a very positive review of the DAC said he tried other wall wart types and linear power supply with it and there was no difference in sound with the Schiit., That would definitely save me money if there is no improvement. Does anyone have a different experience w/ Schiit Modi3?