If necessary, you might need drilling holes.
Determine where you want to put your amplifiers.
A bit of slack in the cables is better than having them too tight.
Some systems are simple stereo audio systems that have limited wattage and two or four channels, so watt speakers, or adding 8 or more just won't make sense.
Description: Make sure you've kept any screws that you had to remove to take the grill or panel off so that you're able to re-secure them properly. Plug your RCA leads, speaker leads and remote turn-on lead from the amp into the back of the head unit.