I am a very picky listener. With my Sennheiser HD 500 headphones, I extensively tested listening to music in various genres and compared the quality with and without this control cable. I listened carefully to the picture, distortion at all frequencies, hiss, attack, decay etc. but couldn't detect it with or without the cable. it looks like a real passport without any additional processing. The middle slider works as expected. You can pause, skip ahead 10 seconds, restart a track, or skip to the next track. Louder and quieter works as expected. I tested it on my Samsung Android phone and iPod 4. Make sure you connect the 4-wire end to your device and the other end to your headphones. then I'll test performance in the field, which for me means skiing Heavenly all day (ha! let's see how it fares in minus 10 winds). in 29 states), which would certainly improve perceptions, but based on what I've heard so far, I doubt even that would change my assessment.
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