Centre (RMS)
Rated power of one centre channel of a home theater. For more information about the meaning of this parameter, see "Front" above.
Subwoofer (RMS)
Rated power of the subwoofer supplied with the home theater. See "Front" above for details on power rating; here we note that subwoofers often have a fairly high power, because. they are designed to cover low frequencies in all audio channels.
Total power (RMS)
The total power rating of all home theater speakers, including subwoofers. The value of the rated power is described in detail in paragraph "Front" above.
Impedance
Home theater speaker system AC impedance. Impedance matters when connected to an amplifier: if the impedance of the speaker system is less than that of the amplifier, distortion in sound is possible, if it is higher, the acoustics may sound quieter than we would like. Naturally, in the original home theater sets, the speakers and amplifier are selected with the optimal impedance ratio, so in fact you only have to pay attention to this parameter when you need to connect acoustics to a “non-native” amplifier.
Front
Rated power delivered by the built-in home theater power amplifier per front channel.
Note that in home theaters the rated power of the amplifier output to any channel (any channel, not just the front one) is usually equal to the rated power of the standard speaker installed on this channel (see above). Therefore, many manufacturers do not give the characteristics of the built-in amplifier separately at all — firstly, they are easy to determine from the information about the speakers, and secondly, when using a system with complete acoustics, these data are not required. However, information about the power of the amplifier is indispensable if you plan to use third-party speakers instead of standard acoustics. The rated power of each such speaker must not be lower than the rated power on the corresponding amplifier channel — otherwise, various undesirable phenomena are possible at high volume, from sound distortion to damage to the speaker.
Rear
Rated power delivered by the built-in home theater power amplifier per rear channel. For more information about this characteristic, see "Front" above.
Centre
Rated power delivered by the built-in home theater power amplifier per centre channel. For more information about this characteristic, see "Front" above.
Subwoofer
Rated power delivered by the built-in home theater power amplifier per subwoofer (low frequency) channel. For more information about this characteristic, see "Front" above.
Progressive scan
Home theater support for
progressive scan, namely, the ability to output a video signal with such a scan.
Initially, scanning was called a method of constructing an image on the screen of a kinescope TV. In such screens, an electron beam is responsible for the image, running around the screen and drawing each frame line by line. Different types of scanning differ in the order of these lines: with the interlaced method, the beam first draws odd lines (1, 3, ...), then even ones (2, 4, ...), and with progressive — each line in turn. The second option is considered more advanced, because. improves image quality and reduces the chance of noise and artifacts. Liquid crystal displays use other imaging methods; nevertheless, the visible features of both types of sweep are preserved for them.
Note that progressive scan is only available if progressive scan is supported not only by the home theater system, but also by the screen on which the images are displayed. On the other hand, most modern TVs meet these requirements; therefore, although it would not hurt to clarify compatibility, most likely there will be no problems with it.
