The Kensington Noise-Reducing AUX Audio Cable is designed for just this kind of issue, and will work with any device that connects to a stereo in the house or the car via a 3.5 mm jack (think headset sized jack with a cable attached.) This device replaces the existing audio cable that goes between your music player and the amp, and includes an in-line noise reducing filter to get rid of those annoying sounds that do not really add to your music.
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