What’s the Problem with Aluminum Wiring?
From the mid ’90s , aluminum wire often replaced copper as a less expensive alternative. Aluminum, however, is not a direct replacement for copper since each type of wire has different physical properties. Aluminum’s properties proved problematic for reasons no one had anticipated. What you need to know is the following: with aluminum wiring it is possible that, over time, a high resistance connection and/or arcing could develop somewhere in the electrical system, resulting in a connection that gets very hot and increases risk of fire. With the extra resistance amps run hotter and produce less power. Your sound quality suffers as well as the life expectancy of your equipment.