I found a dealer who sells HD681, its not red so it cannot be plain HD681, it has to be either HD681b or HD681f, I need the F. Does anyone know any physical difference between them?
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Superlux HD681, how to determine which is F and which is B?
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Head-Fi.org › Forums › Equipment Forums › Headphones (full-size) › Superlux HD681, how to determine which is F and which is B?
