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Headphone Amplifier Donner 4 Channels Metal Stereo Audio Amplifier,Mini Earphone Splitter with Power Adapter-4x Quarter Inch Balanced TRS Headphones Output and TRS Audio Input for Sound Mixer-DEL-4 - Walmart.com
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Headphone Adapter 3.5mm to 4.4mm by iFi audio - Convert your 3.5mm single-ended headphones to work with a 4.4mm Balanced output.
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Amazon.com: aune X7s Pro Class-A Headphone Amplifier with Balanced XLR Out 6.35mm Headphone Out/RCA Preamp Out Line Out/RCA Line in, 3 Gain Levels, for Headphones/Earphones/IEMs/Active Speakers/Power Amps : Electronics
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