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How do I put two LED's in my amplifier for my car's subwoofer?

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I am trying to put LED's in with my amplifier for my car's subwoofer so they pulse with the bass. I have a predicament. I have two red T1 3/4" LEDs and they blow out so easily. I went to a website calculator and it said 120ohm resistor, so I connected all, and right when I bumped the bass, they blew out. Does anyone know the correct amount for the resistor?! I used 12v for positive energy, but recently found out it goes to about 16 for a started car. I recalculated and it said 560ohms. Am I talking gibberish!!? Sorry! :)