The number of individual speaker modules/cabinets in the system.
Wireless computer speakers can receive audio signals from a compatible computer using a wireless technology like Bluetooth or Apple AirPlay.
The direction in which the subwoofer cone points, usually front or down.
Video-shielded speakers won't distort or even permanently damage the picture on older "tube-style" CRT televisions and monitors. Video shielding is no longer a concern with modern flat-panel TVs and monitors.
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