HP4E | 4-channel headphone amplifier
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Amazon.com: Pyle 4-Channel Portable Stereo Headphone Amplifier - Professional Multi-Channel Mini Earphone Splitter Amp w/4 ¼” Balanced TRS Headphones Output Jack and 1/4' TRS Audio Input For Sound Mixer - PHA40 :
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beyerdynamic A 2: high-end headphone amplifier with top audio quality
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