Mercury 2 x 79 Strand Speaker Cable 2.5mm² - Transparent (100m Reel)

The Mercury Economy speaker cable is a 100m reel of 2-core copper clad aluminium (CCA) cable with 79 strands per core, delivering a 2.5mm² cross-sectional area rated for up to 25A continuous current. The transparent outer sheath carries a red stripe on one core for polarity identification during installation, and the 4.5 x 9.0mm profile remains flexible enough to route through conduit, trunking or behind skirting boards without kinking.

Designed for PA system installations, distributed audio zones, and home cinema speaker runs where bulk cable is needed, the 100m reel suits installers wiring multiple rooms or multiple loudspeaker positions from a single amplifier. The 25A rating handles high-power amplifiers driving 8-ohm or 4-ohm speaker loads at distances up to 15-20m without significant voltage drop, making it appropriate for commercial sound reinforcement, conference rooms, and residential multi-room audio.

The copper clad aluminium construction combines the conductivity of copper with the lighter weight of aluminium, reducing shipping costs and easing handling during installation compared to full copper cable of the same gauge. The clear sheath allows visual inspection of the stranded cores, and the red polarity stripe runs the full length of one conductor to prevent phase reversal when wiring multiple speakers in series or parallel configurations.

What's the difference between CCA and pure copper cable?

Copper clad aluminium uses an aluminium core with a thin copper coating, making it lighter and less expensive than pure copper cable. Pure copper offers slightly better conductivity, but CCA at 2.5mm² cross-sectional area provides adequate performance for speaker runs up to 20m at typical residential and PA system power levels.

Can this cable be used outdoors?

The transparent PVC sheath is not UV-stabilised or weatherproof. For outdoor speaker runs, the cable should be installed in conduit, trunking or buried in protective ducting to prevent degradation from sunlight and moisture.

How do I identify polarity?

One of the two cores carries a continuous red stripe along its full length. Mark this as positive (+) at both the amplifier and speaker ends to maintain correct phase across all connected speakers.

What speaker impedance and distance does the 25A rating support?

At 2.5mm² CSA, the cable handles amplifiers delivering up to 200W into 8-ohm loads or 400W into 4-ohm loads over distances of 15-20m with minimal voltage drop. Longer runs or lower impedances may require larger gauge cable to maintain performance.