HiBy HC1 プラグ（Cu4およびCu4ケーブル用）

Swapped this onto my 8 ohm IEMs and the background noise just vanished. The impedance matching actually does something audible.

The 4-pin lock on this cable is such a small thing but it finally stopped the connector from popping loose in my pocket. Ran it with the little decoding plug on a pair of 32-ohm buds and the background is dead silent. Distortion spec sounded like marketing until I actually heard how clean it stays a

I swapped this onto my 8-ohm IEMs and the background noise I used to hear between tracks is basically gone now. The 0.0018% distortion spec sounds like marketing until you actually A/B it against a dongle, the difference in busy passages is real.