[konafocuswrc]

distortion comes when crank up loud..
that is when underpowers speaker, the source distorts and pop speakers by holding cone for certain amount of seconds to produce heat and it will melt voice coil..

overpowers also kill speaker by pushing cone too much in/out and also too much heat/stress..it will torn spider and stuff..

amp is to support not to distort..
deck output(internal amp) is 50w x 4 but it is less than 15w when measured..

when you change speakers, you will have better sound compare to stock but will get distorted when crank up loud..

alpine x speaker is waste if you are not running amp to it..
ref series is 75w rms, get 2 channel amp puts out 75w~100rms range and adjust it not overpowering..

and tune is must.