OCC Copper (Ohno Continuous Cast Single-Crystal Copper)
Specifications
| Short name | OCC |
|---|---|
| Family | Copper |
| Purity | 99.997% (4N7) typical |
| Manufacturing process | Ohno Continuous Casting (heated-mold continuous casting) |
| Conductivity | 101.5 % IACS |
| Resistivity | 1.69e-8 Ω·m |
| Tensile strength | 200 MPa |
Overview
Single-crystal copper produced by the Ohno Continuous Cast process — a quenched-mold casting technique that produces conductor lengths with grain boundaries occurring at meters of length rather than millimeters. The reduced grain-boundary count audibly improves transient response in cables of any meaningful length.
Conductivity is approximately 101.5% IACS — marginally better than OFC, but the audible improvements are dominated by the grain-boundary geometry rather than the bulk conductivity. Premium IEM cables, headphone cables and audiophile speaker cable.
The conductor of choice for the OCC copper IEM cable and the OCC headphone cable. Premium over OFC copper at roughly 3× cost.
Typical uses
- premium headphone cables
- premium IEM upgrade cables
- tonearm wire
Cables using this material
OCC Copper 8-Core IEM Upgrade Cable (4.4 mm Balanced)
0.78mm 2-pin → 4.4mm Pentaconn balanced
OCC Copper Headphone Cable (4-Pin XLR Balanced)
2× 3.5mm TRS → 4-pin XLR balanced
Balanced XLR3 Interconnect (Studio Reference)
XLR3 male → XLR3 female
OCC Copper Speaker Cable (12 AWG, Banana-Terminated)
Banana / spade → Banana / spade
75Ω Coaxial S/PDIF Cable
RCA → RCA