That's pretty much correct.
Inside the audio devices, the two biggest sources of noise are digital processors and switching power supplies, and now, networking devices. Frequencies here are from 10kHz to GHz.So, your DAC, streamer, DSP, or Class D amps, etc. can potentially cross-contaminate.
Using a shielded cable for these reduces the chance of this noise making it elsewhere. Keeping these potentially noisy sources outside the clean zone your linear devices are on makes sense.
Linear supplies can generate switching noise from the diodes in the bridge rectifiers, but in general it's accepted this, when it exists, is of smaller magnitude, lower frequency and easier to deal with.
Inside the audio devices, the two biggest sources of noise are digital processors and switching power supplies, and now, networking devices. Frequencies here are from 10kHz to GHz.So, your DAC, streamer, DSP, or Class D amps, etc. can potentially cross-contaminate.
Using a shielded cable for these reduces the chance of this noise making it elsewhere. Keeping these potentially noisy sources outside the clean zone your linear devices are on makes sense.
Linear supplies can generate switching noise from the diodes in the bridge rectifiers, but in general it's accepted this, when it exists, is of smaller magnitude, lower frequency and easier to deal with.