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Amazon.com: Mackie HM-4 4-Way Headphone Amplifier Bundle with Mophead 10-Foot TRS Cable, 4X 1/4" to 3.5mm Adapter, 4X Cable Ties and Microfiber Cloth : Musical Instruments
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Amazon.com: Customer reviews: Mackie HM Series, 4-Way Headphone Amplifier Mixer Accessory 1-ch x 4 Headphones (HM-4)
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Amazon.com: Mackie HM Series, 4-Channel Headphone Amplifier Rackmount 4-ch x 12 Headphones (HM-400) : Musical Instruments
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Mackie HM-4 4-Way Headphone Amplifier with Audio-Technica Professional Monitor Headphones (ATH-M20X) + 5-Pack, Gold Plated 6.3mm 1/4 inch to 3.5 mm Male to Female Stereo Adapter - Walmart.com
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