5N OFC vs 4N: Can You Hear the Difference in Purity? KEYSION 24G-5N, Tested

For upgrade cables, what you're paying for is materials and construction. The 24G-5N is the top configuration in the KEYSION cable lineup: 5N (99.999%) oxygen-free copper conductors, 24 strands, each with 9 cores of 0.05mm fine copper wire, Litz braided structure, and WTB silver-bearing solder. CNY 228 (USD 35), blue-gray mixed braid appearance.

Parameter	24G-5N Value	What This Means
Conductor Purity	5N Oxygen-Free Copper	Highest purity in the series, fewest impurities
Core Structure	24 strands × (9×0.05mm)	216 fine copper wires, each strand extremely thin, total cross-section sufficient
Braiding Method	Litz structure	Each strand is individually insulated and braided, reducing high-frequency skin effect loss, cable is soft and tangle-resistant
Solder	WTB silver-bearing solder	Solder joints have better conductivity than ordinary tin, less prone to cold joints over time
Plug Pins	MMXC / 0.78mm 2Pin / TFZ	Three pin types available, covering most detachable cable earphones
Plug	3.5mm stereo / 4.4mm balanced	Choose according to source output, 4.4mm recommended for balanced
Y-Splitter	Aluminum alloy	Lighter than stainless steel, less pull when worn for long periods
Length	1.20-1.25m	Extra allowance for phone in pocket and headphones on head

To be clear: Most people can't tell the difference between 5N and 4N in blind tests; its value lies more in the certainty of "maxed-out material specs"—conductor, structure, and solder all use the best materials in the series, so you don't have to guess which part cut corners.

Before ordering, confirm two things: the connector type of the earbuds (MMXC is a screw-in round pin, 0.78mm 2Pin is two pins, TFZ is thicker two pins), and whether the source is 3.5mm or 4.4mm. The 24-strand Litz cable is soft, doesn't stick up when worn over the ear, and doesn't stiffen in winter.