I am using 10awg 2 conductor wiring with an audio amplifier that has a rated power output of 2500 watts and a 4 ohm speaker that is rated at 2500 watts of input. What class wiring is this? Also I am using 18awg 2 conductor wiring with an audio amplifier that has a rated power output of 1000 watts @ 70 volts to a load of sixteen 60 watt 70 volt speakers paralleled. What wiring is this? Is class 2 or class 3 speaker wiring required to be in conduit? If the 10awg wire is an unlisted type can I put it in conduit to comply? In a permanent installation, if I used 12awg 4 conductor SOW wire for speaker wire for applications that have class 1 requirements, must I put it in conduit?