Copper may be a commodity but in wire it comes in lots of different purities and forms. Here are some used in audio cables.
|
Type |
Purity |
Typical Use |
Sonic Intent |
|
ETP |
~99.9% |
Entry-level |
Cost-effective |
|
OFC |
~99.99% |
Mid-range |
Cleaner baseline |
|
LC/PC-OFC |
~99.99% |
Upper mid |
Reduced grain |
|
OCC |
5N–6N |
High-end |
Continuity & smoothness |
|
UP-OCC |
6N–7N |
Statement |
Maximum linearity |
|
Cryo Copper |
Varies |
Premium |
Stress relief |
|
Tinned Copper |
Varies |
Vintage/industrial |
Warmth |
|
SPC |
OFC/OCC core |
Digital/RF |
Speed & clarity |
|
Magnet Wire |
OFC/OCC |
Boutique |
Micro-detail |
|
Litz Copper |
OFC/OCC |
Phono/HP |
HF integrity |

