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Compare Sony MDR-J20 vs. Sony MDR-RF840RK

This is a side-by-side comparison of the specs of the MDR-J20 vs. the MDR-RF840RK. Differences are highlighted in yellow.
Item MDR-J20 MDR-RF840RK
Item image Item image
Impedence 16Ω [x] 28Ω [x]
Cord length 1.2m [x]
Magnet Neodymium [x] Ferrite [x]
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