Comparison Sony BDV-N9200W vs Sony DAV-DZ840

Rated output of one front channel of a home theater system. This paragraph indicates the power of the complete front speaker, however, it can also be used to determine the characteristics of the built-in amplifier — its rated power on a particular channel (not necessarily the front one), usually, slightly exceeds the power of the corresponding speaker.

Rated power in this case is the highest average (root mean square, RMS) sound power that the speaker is capable of delivering for an unlimited time, working without failures and overloads. Individual signal jumps can be stronger, but the power of acoustics is determined precisely by RMS.

The higher this indicator(regardless of whether we are talking about front or some other speakers) — the louder the speakers, the better they are suitable for large rooms. At the same time, in a small room, too high power may be unnecessary, because. operating the speaker at full volume will cause discomfort — despite the fact that powerful acoustics also have the appropriate dimensions, weight and price. More detailed recommendations on the optimal power of the speaker components, depending on the characteristics of the situation, can be found in special sources.

Rated output of one home theater rear channel. For more information about the meaning of this parameter, see "Front" above.

Rated power of one centre channel of a home theater. For more information about the meaning of this parameter, see "Front" above.

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.

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.

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.

The ability to connect speakers to the base via a wireless interface — most often a radio. The main advantage of this connection is the absence of connecting wires, which significantly limit the movement of the speakers and can interfere, getting confused with each other and with other wires. The disadvantages of wireless speakers are often lower sound quality than wired counterparts, as well as high cost.

An optical disc format supported by the built-in home theater drive.

— CD/DVD. Optical discs of small (CD) and medium (DVD) capacity. The former are well suited for recording music, but a full-length film on such a medium can only be recorded in low quality. The latter allow you to record both music and video in medium and even high resolution. CD and DVD are supported by all home theater models capable of reading optical discs.

— Blu-ray. High-capacity optical discs designed specifically for recording large volumes of information, in particular high-definition video (including 3D) combined with multi-channel sound. However to fully view Blu-Ray discs, you need not only a player, but also a TV that supports the appropriate resolutions and capabilities.

The ability to play home theater "three-dimensional" video and photo, that is, an image that, in addition to height and width, has a visible third dimension — depth. The illusion of depth is created by the difference between the images seen by the left and right eyes. Both pictures are displayed on one screen, and the role of a filter that allows each eye to see its own part of the image is usually performed by special glasses. Note that for normal 3D playback, such an image must be supported not only by the cinema player, but also by the screen or other device where the image is displayed (TV, monitor, projector, etc.). At the same time, home theaters, usually, are not equipped with 3D glasses — such glasses are either included in the delivery package of the mentioned playback device, or they must be purchased separately.