Anticables speaker wire is 12 gauge as are many other brands , but are stiffer because they are single-conductor rather than twisted or woven from many strands of smaller wire to equal 12 gauge . Those others are more flexible due to the smaller diameter of the individual wires . Enamel insulation is typically good up to 600 volts, ac or dc , but so thin it can easily be scraped off . Check if your amplifier case is connected to power supply ground, and if so make sure the cables can't scrape against a sharp metal edge . This happened to me with another make of enamelled wire and I shorted out one of my monoblocks . The manufacturer was understanding and repaired it . Now using their Level 3 myself , with 4" of techflex protecting the amplifier end .