help with tunning amp

I have a 2-ohm kicker l7 solobaric in a ported kicker bo. I also have a kenwood kac9104-d amp what should i set the amp at to match the sub. Also the amp has a phase switch can someone please explain to me what this does in detail so i dont fry my sub

hard to say what all controls are on the amp and what you really need to adjust. The sensitivty gain matches the amps input to the cd players output, best to start low - turn the knob all the way counterclockwise and start like 1/4 of a turn up. The crossosover switch should be set to LPF and the freq maybe start around 80 or so. The phase switch is the same as wiring the speaker backward (+ to - and - to +), it won't hurt anything.