I just bought a pair of Sennheiser headphones that isolate the outside sound so that the music you hear is crystal clear, the drivers are also very far into your ear. This produces a music (or podcast) experience that is fantastic. One other side benifet is that the volume is very low. Using the stock portable music player headphones I would have to crank the volume to get an acceptible volume, now all I need is about one fifth the volume to acchieve the same results. If you are using some older less efficient head phones that need lots of drive to get acceptible sound this Headphone Amplifier could be just for you.
"Apart from running headphones crystal clear, another advantage is that it can act as gain enhancer for my gainclone when watching movies from PC."
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