A easy strategy to make your telephone, pill or laptop computer sound higher. Low cost one too.

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Listening setup:

Headphones: AKG Ok92, Takstar Professional 82, Sennheiser CX300-II, SoundMAGIC E10, KZ ZSN
Built-in Amplifier: Cyrus 8vs2
Audio system: Acoustic Vitality Aegis Evo 3