Currently, there are a huge number of firms, types, classes and powers of amplifiers.
The main parameters when choosing an amplifier for speakers or, as it is right, acoustic systems (AC) are:
- Music (Music), otherwise program (Program) power (W);
- resistance (Ohm).
Software power, what is it?
Any speaker has 3 types of power: peak power (Peac), Program (music) power and RMS power (for some time with nth power, a pink noise signal is sent to the speaker, so vital functions and its performance are checked). The signal for calculating the programmed power is presented in the form of an average musical signal, with attenuation and peaks. Such a signal, in contrast to pink noise, is easier to reproduce by the speaker and it heats up less. It is from the RMS power that the program power is calculated, which is approximately equal to twice the RMS. Another 2 times more software is the peak power, but in order to choose an amplifier you should not pay attention to it, since it lasts only a few milliseconds on the speaker.
As a rule, all 3 types of power are written in the AC passports, but if one is indicated, then it is not difficult to calculate the program power. It is also calculated from other measurement standards: AES, EIAJ, etc.
4 or 8 ohms is the impedance of most systems. In order to choose the right amplifier, attention must be paid to how much power the amplifier can deliver and at what resistance. This is usually indicated in its parameters. You can connect the speakers in parallel (through special connectors).
R total = (R1xR2) / (R1 + R2) is a formula for calculating the total resistance of 2 parallel-connected speakers, where R1 and R2 are the resistances of the corresponding systems. With the same resistance for both speakers, you can simply divide the resistance of one by two. Connecting to a power amplifier of a system with an impedance less than the minimum possible for it is prohibited! Always check the amplifier impedance and the total impedance of the connected speakers according to the passport.
If the amplifier is in bridge mode, then the 2 channels are combined and the resulting impedance increases. Each amplifier has only one RMS power and it is for it that the speaker is selected. The amplifier must not be allowed to operate with a “clipping” overload, in which case even low power can damage the speakers!
