led speaker wiring self

The car I drive is a 1997 mercury sable wagon. Now before anything is said, yes I know it is an old person car, but I am 18. I have an aftermarket radio and speakers (front and back.) While driving home from work I was thinking it would would kind of cool to have some LED's wired into the speakers (door panel) to flash to the music. The basic way to do so is to wire them to the +/- terminals on the speakers(?) If so would I need to wire in a resistor for the LED's? I am not sure because resistance in parallel is must be lower then the smallest resistance, thus would it effect the audio? Thanks much

Ahh being 18 with an abundance of tinker time, I miss those days... On to your question: Wire your LEDs for 12volt input (adding appropriate resistors) and attach to the speaker. I have hooked up "12 volt" LEDs to speakers and have not had a problem. This is on a HU with 40w X 4 nothing more then that though.

Since each LED is under 100mW, it won't have an effect (ie, its resistance is at least 100 Ohms which is insignificant to 8 Ohms and lower). That does assumes peak speaker voltage doesn't exceed the (series) LEDs' breakdown voltage...