
I bought this to fix floor noise in my BMW with my iPod touch 4g. While this got rid of the hiss, it cut the volume by more than half and it was unbearable. Turning the volume up to maximum didn't help either. I went ahead and bought a Fiio L9 which solved the noise problem, didn't turn down the volume and didn't have circuitry to jam the signal before it reached the radio.

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