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AQUA: A new open-source equalizer interface for Windows (x-post from r/audiophile, please see the comments for more info!) : r/headphones
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InLine® AmpEQ Hi-Res AUDIO Headphone Amplifier + Equalizer 3.5mm Jack USB powered | Headphone-Amplifier | Input / Output | Product Overview | INTOS ELECTRONIC AG - Online Store
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