A:AnswerYes, even preferable if the Sirius receiver is only one of multiple sources connected to that stereo receiver (i.e. Sirius, cable box, CD player) which allow the listener to choose any of those multiple sources for playback.
A:AnswerCommercial-free, interruption-free, consistent constant music that is tuneable to personal music interests whether it be time-period, type of music, even artists.
A:AnswerYou can certainly add a second radio to your current vehicle subscription but it will require a second subscription. Be sure to add any new radios to your existing account in order to take advantage of the multi radio discount rates.