Ultrasone HFI-680 Headphones Review

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techPowerUp takes a look on the Ultrasone HFI-680 Headphones A quote from the article:

The newest addition to the HFI headphone lineup from Ultrasone is called the HFI-680. These new mid to high end cans should effectively fill in the gap between the old Ultrasone lineups 650 and recently launched HFI-780.

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