Since it doesnt look like Power is gonna help you, He was probably installing a monster system and got trapped under the speaker box or something.
I have a loud home stereo just like you and if I put the speakers too close to the stereo sometimes it will skip cause of the bass.
If your stereo is on a hard floor that could make a difference in my old apartment I had the stereo on a tile floof and it would skip with the bass up loud on it.
In the apartment that I live in now I have my stereo on carpet and it doesnt skip anymore so if your stereo is on a hard surface maybe throw a rug under it or something to absorb the vibration.
If the laser alignment is off usually it will skip at all volume levels not just when you crank it.
Good luck
------------------
88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires. Edelbrock 1 1/2 inch drop springs.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph, Stock gears and 3000+ Altitude