David Clark H10-66 High, Low Dual Impedance Headset
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100 Ohm Magnetic Impedance Headset IDEAL for Crystal or TUBE CW Radio HEADPHONE | eBay
K240 Studio Over-Ear Semi-Open Pro Headphones, 15-25000 Hz Frequency Bandwidth, 55 Ohms Impedance, 1/4" and 1/8" Screw-on Jack Combo - With H&A Clamp On Headphone Holder For Mic Stand - Walmart.com