Looking to run some speaker wire inside a wall & into the attic. From looking around I found out that there's wire rated for inside walls. From what I found searching, these types of wires seem to come in 2 conductor & 4 conductor packages. This may be a dumb question but does 2 conductor mean that there's 2 seperate wires inside the outer insulated jacket & 4 conductor means there are 4 seperate wires? Also I found some 16/2 wire advertised as 65 strands of copper per each. The ad stated the specs : (UL) 16/2 SPT-2 E-25411 c(UL) FT2 and said it was rated for 300 volts and could be used for speaker wire as well as some electrical applications. Is this type of wire just as good as any other 16 gauge wire (for use as speaker wire) specifically branded as 'speaker wire'