Multimedia Speakers
Computer speakers, or multimedia speakers, are speakers sold for use with computers, although usually capable of other audio uses, e.g. for an MP3 player. Most such speakers have an internal amplifier and consequently require a power source, which may be by a mains power supply often via an AC adapter, batteries, or a USB port.
The signal input connector is often a 3.5 mm jack plug (usually color-coded lime green per the PC 99 standard); RCA connectors are sometimes used, and a USB port may supply both signal and power (requiring additional circuitry, and only suitable for use with a computer). Battery-powered wireless Bluetooth speakers require no connections at all. Most computers have speakers of low power and quality built in; when external speakers are connected they disable the built-in speakers. Altec Lansing claims to have created the computer speaker market in 1990.
More sophisticated computer speakers can have a subwoofer unit, to enhance bass output. The larger subwoofer enclosure usually contains the amplifiers for the subwoofer and the left and right speakers.
| Normal Diameter | 3 INCH SPEAKER | 4 INCH MIDRANGE | 4INCH WOOFER | 5.25 INCH WOOFER | 6.5 INCH WOOFER | 8 INCH WOOFER | 10 INCH WOOFER | 10 INCH WOOFER |
|---|---|---|---|---|---|---|---|---|
| Nominal Impedance | 4Ω/8 Ω | 4Ω/6Ω/8 Ω | 6Ω/8 Ω | 4Ω/8 Ω | 4Ω/8 Ω | 4Ω/8 Ω | 4Ω/8 Ω | 4Ω/8 Ω |
| Nominal Power Handling | 10W | 20W | 20W | 30W | 50W | 60W | 80W | 80W |
| Max Power Handling | 15W | 30W | 30W | 40W | 60W | 70W | 90W | 90W |
| SPL Level | 80dB | 80dB | 76dB | 76dB | 78dB | 78dB | 82dB | 82dB |
| Frequency Range | 20Hz to 20KHz | 20Hz to 20KHz | 20Hz to 20KHz | 20Hz to 20KHz | 20Hz to 20KHz | 20Hz to 20KHz | 20Hz to 20KHz | 20Hz to 20KHz |
