I have had the same bare wire that started at 50 ft for 20 years. I don't know what the plastic inside does but it shouldn't make a difference in sonics. Banana connectors are superior to bare wire if you intend to replace the speakers just for ease of use. But for a single installation I think it's more trouble than it's worth.Question for you experienced audio folks. The speaker wire I am using has no connectors, just bare cable. Is there any advantage to banana plugs, spade connectors or pin connectors? Do they just make equipment easier to hookup? Also the speaker wire I have (14 gauge bought from Best buy 17 ish yrs ago) has a clear plastic core with which the wire is wrapped around. Is that snake oil, or does it have a legitimate use?
If the speaker plugs are close together and you're worried about shorting the amp it isn't much of a hassle.