LSP PVC Sheathed Loudspeaker Cable for PA systems, background music, and hi-fi audio installations. Fine-stranded copper, PVC insulation, colour-coded polarity identification.
Loudspeaker cables carry the amplified audio signal from power amplifiers to loudspeaker drivers — operating at audio frequencies (20Hz–20kHz) with relatively high currents (up to 10A or more for high-power PA systems) at low voltages (typically below 100V for 8-ohm loads). The critical electrical parameters for loudspeaker cables are low DC resistance (which increases effective source impedance and reduces damping factor) and low inductance (which attenuates high frequencies in long cable runs).
The LSP uses LSP designation covering a range of loudspeaker cable constructions from 2-core twisted pair to 4-core configurations for bi-wiring and distributed audio systems. These properties make it suitable for professional PA installations, commercial background music distribution, and residential hi-fi loudspeaker wiring.
| Cross-Section | Resistance/Conductor | Suitable Run Length (8Ω load) |
|---|---|---|
| 0.75 mm² | 26 Ω/km | Up to 10 m |
| 1.5 mm² | 13.3 Ω/km | Up to 20 m |
| 2.5 mm² | 7.98 Ω/km | Up to 40 m |
| 4.0 mm² | 4.95 Ω/km | Up to 60 m |
The maximum acceptable cable resistance for a loudspeaker run is approximately 5% of the nominal speaker impedance — 0.4 Ω for an 8Ω speaker. Select the cross-section that keeps the round-trip cable resistance (2 × conductor resistance × length) below this limit. For runs over 20m to 8Ω speakers, use 2.5mm² or larger.
100V constant-voltage PA distribution systems are more tolerant of cable resistance than low-impedance systems — the high distribution impedance makes cable resistance relatively insignificant. For 100V line systems, 0.75mm² is adequate for most building distribution runs.
