Use 0030 for better sound quality.
[Fix] HyperX Cloud II annoying high treble and little low bass Today, I found how to fix my Cloud II horrible boosted treble and very little bass problem.
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Download and install Equalizer APO from https://sourceforge.net/p/equalizerapo/
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During installation, select HyperX Cloud II from the playback devices available and hit OK.
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Open Equalizer APO Configuration Editor from the start menu.
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Inside 'config.txt' window, delete the three default presets. (click the red minuses)
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Click the green plus to add this preset: (Graphic equalizers > 15-band graphic equalizer)
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Click the little notepad button and copy-paste this config: GraphicEQ: 25 1.8; 40 1.4; 63 1.4; 100 0.6; 160 0; 250 -3; 400 -4.6; 630 -4.6; 1000 -4.6; 1600 -4.6; 2500 -4.2; 4000 -4.6; 6300 -5.8; 10000 -7.8; 16000 -9
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Turn off this preset and turn it on again.
That's all, your headset should sound way better than how it came from the box.
Source: https://steamcommunity.com/discussions/forum/1/1729828401679409289/