Review of the Ultrasone HFI-680 natural surround sound headphone. Ultrasone, if you've never heard of them before, is that other German headphone company, but THE headphone company according to them. Of course, the other would be Sennheiser. They've been in business since 1991 and have several patented technologies. One of which is their S-Logic technology, which gives us this natural surround sound effect, and the other is their Ultra Low Emission - ULE shielding that keeps your brain from frying by reducing radiation from the drivers by up to 98 percent.
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