Ah, no.
Superconductors are used at CERN to produce massive magnetic field that in turn deflect tiny particles so that they can identify them. The magnets draw some 11,000 amps to create that field so any resistance in the coils would cause massive losses. By cooling them to such low temperatures and using superconducting material, the losses go to almost zero allowing them to work.
Prior to collision, superconducting magnets also accelerate the particles and yet again, superconductivity brings efficiency and high magnetic field.
Superconductivity is not used to pick up small signals as you are assuming.
I have not read anything outside of usage at CERN/LHC's that is beyond building super powerful magnets using superconductors. That application naturally has nothing to do with transmission of audio in a home system operating at room temp.