Mercury 2 x 42 OFC Figure 8 Speaker Cable - White 100m Reel

The Mercury 2 x 42 is a figure 8 speaker cable with two cores of 42-strand oxygen-free copper (OFC) conductors, each with a 0.74mm² cross-sectional area, rated for up to 6A current. The white PVC sheath includes a black polarity line running along one core to ensure correct speaker phasing during installation.

Designed for residential hi-fi systems, home cinema installations and distributed background music networks, the cable handles medium-power speakers at distances typical of domestic rooms without significant signal loss. The OFC conductors reduce resistance compared to standard copper, providing cleaner signal transfer across the audio frequency range. The 100m reel supplies enough cable for multi-room systems or commercial installations where cable is run from a central amplifier to distributed ceiling or wall speakers.

The figure 8 profile (3.5mm x 7.0mm) splits easily by hand into separate cores when terminating at speaker binding posts or amplifier terminals, and the 42-strand construction per core provides flexibility for routing behind walls, under floors and through conduit. The white sheath blends with painted skirting, white trunking and light-coloured walls in modern interiors, while the black polarity line remains visible enough to avoid reverse-phasing mistakes during termination.

What speaker power can this cable handle?

The 0.74mm² CSA and 6A rating suit speakers up to approximately 70-80W RMS at 8 ohms over typical domestic cable runs of 10-15m. For longer runs or higher-power speakers, stepping up to a larger CSA cable reduces resistance and maintains performance.

What does OFC mean and why does it matter?

Oxygen-free copper is refined to remove oxygen impurities, reducing internal resistance and improving conductivity compared to standard copper. For audio applications this translates to lower signal loss and cleaner frequency response, particularly at higher frequencies.

Can the two cores be separated?

Yes. The figure 8 profile splits easily by hand along the centre join, allowing the cores to be separated when terminating at binding posts or running through tight spaces. This is a standard feature of figure 8 speaker cable.

What's the black polarity line for?

The black line runs along one core to identify polarity. Connecting the marked core to the positive terminal on both amplifier and speaker ensures all speakers in a system are in phase, avoiding phase cancellation issues that reduce bass response and stereo imaging.