If you want to buy a home theater, but do not consider ready-made solutions, but select all the components yourself, then sooner or later you will have to face the question of choosing a suitable amplifier. This device plays an important role, so you need to select it with special care. The amplifier connects the signal source and the speaker system, amplifying the electrical vibrations at specific frequencies.
Instructions
Step 1
There are power amplifiers and stereo amplifiers. Devices of the first group are more functional and are capable of processing up to 7 channels simultaneously, while the second type of equipment works with only two sound channels. You need to make a selection based on your own needs, although it is better to purchase a power amplifier right away, since it is more functional.
Step 2
Decide on the conditions for using the device. Estimate the size of the room where the system will be located. The smaller the area of the room, the less the power of the amplifier should be. For small rooms up to 15m ^ 2, 50W is enough for each channel, and for a room of 20m ^ 2, about 100W of sound will already be needed.
Step 3
The amplifier should be taken with a power reserve, since working at the maximum possible will negatively affect the sound quality and the operation of all components. Therefore, when selecting the power of the amplifier, one should study the characteristics of the existing acoustics. It is best if the power of the device is greater than or equal to the same characteristics of the speakers. Only then will you be able to fully enjoy your sound system.
Step 4
In addition to power, another important parameter is the minimum resistance. This characteristic is important for maintaining the compatibility of all devices in the system. If the value of the minimum load of the acoustics is lower than that of the amplifier, then the latter can easily fail. The best choice is a 4 ohm device.
Step 5
Pay attention to the range of frequencies that the device reproduces (the human hearing perceives frequencies from 20 to 20,000 Hz). Also look at the signal-to-noise ratio value. The higher this indicator, the less noticeable the noise during playback.
