Cellphones and cordless phones emit far higher frequencies than the frequency components of the digital hash, other component-induced noise, and power line noise that we have been speaking of. I believe cellphones operate in the range of 800 to 1900 MHz or so, while cordless phones are around 2400 MHz. Audio equipment seems unlikely to have any detectable sensitivity to frequencies above perhaps a few ten's of MHz, and perhaps much less than that.
Also, as you appear to realize, these kinds of issues are likely to be dependent on location, house wiring, system components, system interconnections and setup, and listener.
Regards,
-- Al
Also, as you appear to realize, these kinds of issues are likely to be dependent on location, house wiring, system components, system interconnections and setup, and listener.
Regards,
-- Al