Quick Answer / Summary: Three meanings: speaker wire (amplifier to speaker, two conductors, gauge matters), interconnect (source to amplifier, shielded, capacitance matters), and power cord (mains, safety matters). Identify the two ends of the run, then apply that domain’s rule – gauge for speakers, shielding for line level, ratings for mains.
Sound wires is a shopper’s phrase rather than a product name, and it can mean three different cables with three different jobs. Sorting the phrase into products takes one question: what does the wire connect?
From Phrase to Product
The ends of the run identify the product. Amplifier terminals to speaker terminals means speaker wire. A source’s output sockets to an amplifier’s input sockets means an interconnect. A wall outlet or IEC inlet means a power cord. Each domain has one governing parameter, and choosing by phrase rather than by function is how the wrong product ends up in the basket.
Speaker Wire: Gauge Governs
Two-conductor copper, 16 AWG to 15 metres, 14 AWG to 25, 12 AWG beyond. Resistance and damping decide the purchase; shielding is irrelevant at speaker level.
Interconnect: Shielding Governs
Small signals into high-impedance inputs need shielding and low capacitance. Gauge is irrelevant here, and short runs are always preferable.
The Purchase That Covers All Three
A practical drawer holds one spool of correct-gauge speaker wire, one set of shielded interconnects in the lengths the system needs, and the power cords the equipment shipped with. That inventory covers every sound wire question without buying anything exotic.
Labelling the Drawer
Label by domain: speaker leads by gauge, interconnects by connector and length, power cords by plug type. The label prevents the cross-domain substitution that causes most mystery hum.
What to Ignore
Directional marks, burn-in periods and exotic dielectrics do not change what a sound wire does. The three domain rules above decide performance; the rest is packaging.
The One-Page Buying Guide
Photograph both ends of the run, note the length, and the product names itself: speaker wire if the ends are speaker terminals, an interconnect if they are signal sockets, a power cord if either end is a mains inlet. Three photographs and one measurement replace every vague phrase in the search bar.
Sound Wire Domains
| Job | Product | Governing Parameter |
|---|---|---|
| Amp to speaker | Speaker wire | Gauge and resistance |
| Source to amp | Shielded interconnect | Shielding and capacitance |
| Outlet to gear | Power cord | Safety and current rating |
| Any domain | Never substitute | Hazard or hum |
| Buying rule | Identify both ends | Then apply the domain rule |
Practical Applications
Translating a vague search into the right cable, stocking a household audio drawer, replacing a lost lead correctly, and stopping the cross-domain substitutions that cause hum.
Frequently Asked Questions
What are sound wires called properly?
Speaker wire, interconnect, or power cord – each names a different product and job. Identify the two ends of the run and the correct name follows.
Can I use speaker wire as an interconnect?
No – the signal would travel unshielded into a high-impedance input and pick up hum. Use a shielded interconnect for line level.
What gauge speaker wire do I need?
16 AWG to 15 metres, 14 AWG to 25, 12 AWG beyond, with one step heavier for 4-ohm speakers. Buy 100% copper, not copper-clad aluminium.