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Compare Sennheiser HD 4.50R vs. Sennheiser HD 660 S Apogee

This is a side-by-side comparison of the specs of the HD 4.50R vs. the HD 660 S Apogee. Differences are highlighted in yellow.
Item HD 4.50R HD 660 S Apogee
Item image Item image
Impedence 18Ω [x] 150Ω [x]
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