Power per channel
Nominal sound power (see "System power") on each of the main channels of the audio system. This indicator is most often indicated in models with a subwoofer (see "Number of channels"); knowing it, you can estimate the power distribution between the main speakers and the subwoofer.
Frequency range
The total frequency range reproduced by the acoustics of an audio system. Measured from the lower threshold of the lowest frequency speaker to the upper threshold of the highest frequency: for example, in a 2.1 system with main speakers at 100 – 22000 Hz and a subwoofer at 20 – 150 Hz, the total value will be 20 – 22000 Hz.
In general, the wider the frequency range, the fuller the reproduced sound will be, the less low and high frequencies will be lost due to insufficient acoustic capabilities. On the other hand, do not forget that the actual sound quality also depends on a number of other parameters — primarily the frequency response. In addition, human audible frequencies range from 16 Hz to 22 kHz; deviations from these values are very small, and the upper limit also decreases with age. Therefore, from a practical point of view, it does not make sense to provide too large a frequency range; and impressive performances like 10 – 50000 Hz, found in top-class models, are usually more of a kind of "side effect" of high-quality speakers (and at the same time — a marketing ploy) than a really significant moment.
IPhone / iPad docking station
Type of docking station for connecting Apple gadgets to the audio system – primarily iPhone smartphones and iPad tablets.
The dock itself is a special socket with a connector in which you can install a mobile phone (or other gadget), thus connecting it to the sound system. This is often easier and more convenient than using a cable, and it also allows to use various additional features – for example, control the player on your smartphone through the remote control of the audio system.
As for the type of docking station, in this case it is indicated by the type of connector used for connection. It is worth noting here that since 2012, only the
8-pin (Lightning) interface has been installed in Apple portable gadgets, and docks are made for it in all modern audio systems. The earlier 30-pin connector is found only in older models; there are also devices that support both interfaces at once.
Remote control
A
remote control is included with the audio system. The convenience of this function is obvious: instead of having to approach the device every time to change the operating parameters, you can give a command from the remote control without getting up.
