- First Q: S/PDIF is not a type of cable or connector, it's a type of digital audio. It can be carried over either RCA ("coaxial" digital audio ports and 2-conductor cables) or over TOSlink (optical digital audio ports and fiber optic cables). - Second Q: You can tell if it's a TOSlink cable (see below) because that is the only standardized use for that connector and cable, not if it's an RCA cable because RCA connectors/cables can be used for other signals too (although RCA S/PDIF jacks are usually color-coded orange, which helps). - Third Q: No. RCA is a type of connector (not a type of signal). RCA connectors/cables are not always analog audio; they are also used for digital audio and a few types of video. ... View more

use the digital copy. ... View more

You're sound system should have an Auxiliary port (or jack). Get yourself an AUX (Auxiliary) cable. It will probably be a 3.5mm male to male jack. Plug one end in to your iPhone and the other into the sound system. Set the function on the sound system to AUX. You should be gold. And if the music isn't coming through and you've got it cranked right up, try turning the music up on you phone. ... View more

Stereo ... View more