All wiring used behind walls, under floors or otherwise installed as a structural component of the building must be properly rated. Even speaker wires that go inside the walls have to be rated as either Class 2 or Class 3. Next you need to decide on wire gauge and conductor count. How do you know what's right for the job? Well, let's look at the speaker wire, for instance. The distance from the audio amplifier to the speaker location is a major factor in deciding which wire is right for the installation. Every foot of speaker wire adds more resistance, capacitance and inductance to the performance equation. Shorter runs of wire that are twisted and shielded a certain way yield better sound quality.
Some tips for maximizing the performance of your structured wiring system include:
- For less than 50 feet to the speakers or volume control, 16AWG (gauge) works fine.
- From 50 feet to 100 feet, use 14AWG.
- For 100 feet or more, use 12AWG. Some additional good things to remember are:
- For primary sound where dynamic range is at a premium, use more copper.
- If you are wiring main speakers, use heavier gauge.
- Don't underestimate the value of shielding for reducing noise.