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PreSonus HD9/HP4 Pack 4-Channel Headphone HD9 / HP4 PACK Greentoe
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JVC 5944 4-Channel Headphones
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AKG HP4E 4-Channel Headphones Amplifier
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Vintage JVC 5944 Quad Quadrophonic Headphones 4 Channel Tested Guaranteed for sale online | eBay
Vintage Toshiba 4-Channel headphones | Headphone Reviews and Discussion - Head-Fi.org
