What is the difference between -10dBV and +4dBu?

11.7 (trick question). But the real answer you are looking for is “when and why do I use the Gain button?” When plugging in an unbalanced, consumer level source like a headphone computer output, iPod, DVD player, the level is low (.773 volts vs. 1.23 volts), so set the input to -10dBV. The gain switch boosts it to professional, +4dBu for use with your pro-level studio equipment (converters, mixing consoles, etc).

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