Audio Input Methods for injecting PC-Sound into the car amp AUX-IN Input If your car amp has an AUX-IN (or name it LINE-IN),you don't have any problem. You only have to connect the soundcar-output to the car radio aux input. (In general this is 3,5mm latch to 2-Cinch) Adapter-Cassette If you don't have an AUX-Input, but you have a car amp with cassette support and you are canny, then you can use our cassette-adapter. This is a cassette with an inifinite band and a connection cable for connecting to the computer (3,5mm Latch). You only have to plug the cassette into your amp and you will hear the sound output of your PC. FM-Modulator The best alternative to AUX-IN is the FM Modulator. On a radio frequency you can choose, you will be able to hear the sound ourput of the computer.The modulator has to be plugged between the car amp and the car antenna cable.Then you connect the modulator with your car computer. The advantage is, that you can hide this device very good behind the car amp. Best is, when you program the choosen frequency (eg. 88,00 Mhz) on the first memory slot so you can switch fast to the sound output of your PC. AUX-Adapter Perfect if your car is supported : An AUX-Adapter with PC-Interface ! Amplifier If you do not use a car radio anymore and you want to have perfect sound output, then you can connect the souncard-output of the carpc directly to an amplifier with a 3.55mm-to-cinch cable.