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I hope that this page copies right. This is from Belden's Web site...www.belden.com Electrolytic Tough Pitch (ETP) - Copper Cables Electrolytic Tough Pitch (ETP) HIGH CONDUCTIVITY Copper Speaker Cables Speaker cables are used to connect receivers or power amplifiers to speakers and are...

Jeff, For the CORRECT facts: 1. There are three types of jackets over the twisted pair of wires. a. pvc - the lowest cost option. this is used the most often in residential and commercial installations. this jacket has no additional fire rating and can only be used in sealed walls that...

Jeff, Sorry, but the moisture issue is a old wives tale....I sell the wire for a living. It is designed that way for ease of install..(round vs flat) and to reduce chances of rf interference...esp because many times in commercial installations the wire length can be thousands of feet. Russ

the biggest advantage of install type cable is that is a twisted pair cable. the twisted pair will reject rf interference much better than the tradtional zip cord style of speaker wire. it is the same twisted pair configuration that cat5 cable uses to reject interference on networking lines...