So much wrong in this reply. Since you failed to mention the vehicle you drive, not everyone on the planet is gonna drive the same vehicle as you and don't bother upgrading the electrical. You need to take in consideration that there are 4 bangers out there with weak stock electrical that barely is enough for the car's needed everyday daily things such as a/c, heater, wipers, etc. So if a person decides to install say a 1000 watt amp and 1000 watt sub to existing stock electrical, more than likely that amp is gonna rob more amperage from the alt than anything else...leading to dimming headlights. I will agree tho that most bigger trucks/ SUV's have the most/best stock beefed up electrical out there. But...I certainly wouldn't ignore it if I were adding audio.