I would not place my audio gear physically close to any typical household computer or router due to potential for RFI type digital noise as Al alluded to. I tend to avoid wired connections as well just as a precaution.
Otherwise Wifi and other radio signals in the air should have no effect on the sound of most audio gear under normal circumstances. The proof would always be in the pudding though via testing with and without presence of suspect offending devices.
A Wifi network data connection from computer server to audio gear is an excellent solution for best isolating potentially noisy digital computers from audio gear that I strongly recommend when needed.
Otherwise Wifi and other radio signals in the air should have no effect on the sound of most audio gear under normal circumstances. The proof would always be in the pudding though via testing with and without presence of suspect offending devices.
A Wifi network data connection from computer server to audio gear is an excellent solution for best isolating potentially noisy digital computers from audio gear that I strongly recommend when needed.