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What are the differences between the different gain models? Which is best for K7XX and which is best for HD6XX?

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johnnygolden4
21
Dec 24, 2019
The different gain stages are just about multiply the amount of voltage applied and amplifying the initial preamp signal more. Both the hd6xx and k7xx are relatively easy to drive dynamic headphones so both should be okay on the 2.5x/low gain mode of the standard model. It's possible that the 6xx may need to be moved to the higher mode but as the O2 is such a neutral amplifier the gain stages don't change the sound so it's simply a matter of you going "I've turned the volume past half way and it's not loud enough so I'll turn up the gain". Completely up to if you need the extra volume or not.