Cloudlifter works as advertised. You've bought a Shure SM7B and a cheap Scarlett 2i2 interface and you want to get more gain out of it, this is what you need. -o-clock with cloudlifter added gives me about the same gain. This means that if you're already happy with the 2i2's maximum volume, running it at a lower gain and adding cloudlifters is getting you stuck. If you want a little more volume, that's great. I've seen some youtube reviews that seemed to suggest that the last little boost on the 2i2 was "very loud" so adding a cloudlifter to your circuit will reduce the noise at the same volume, but that's not my experience .
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