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Amazon.com: 7 Band Sound Equalizer, Output Input, 12dB High Bass Adjustment, Two Channel Digital Equalizer, 3.5mm Interface, for Recording, Streaming, Podcasting : Electronics
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EQ-7 Car Audio Headset Amplifier 7-Band EQ Equalizer 2 Channel Digital Sound Equalizer - Walmart.com
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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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Amazon.com: RadioShack Stereo Amplified Listener with 3-Band Equalizer - Compact, Portable - Fits All Headphones with 1/8" Plug : Electronics
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