Need to be carefully chosen between car audio equipment, reasonable collocation can obtain the best effect.
In the car audio amplifiers and speakers, for example, they only do impedance matching, power match, working frequency matching to guarantee the safe operation of the audio equipments, and fully excavated the biggest potential.
Despite the boring theory knowledge, simple explanation is speakers with an impedance of power amplifier can bear a certain range. Only pick up on the pa speaker impedance in this range, power amplifier can work safety and provide the most ideal power output!
Different models of the impedance of the power amplifier can bear is different. For example: alpine MRV series amplifiers rated impedance is 4 ohm (each 4 ohms), the MRD series amplifiers rated impedance is 2 ohm.
When we are in the power matching, must first understand usually nominal power of the two indicators: maximum power and continuous output power (RMS).
There are many brands of power amplifier and speaker used maximum power evaluate the superiority of the equipment. In fact this is not the scientific evaluation method. Nominal maximum power is without considering the distortion, the equipment in a very short time (usually only a few milliseconds) does not occur in the physical damage or damage of the electrical power value.
Continuous output power (RMS) is in the case of does not produce distortion, can continue stable work power. This value is only can truly reflect the working state of the equipment.
Usually a lot of people may cause the speaker coil burned are the main factors caused by the power amplifier's power is greater than the speaker. So for equipment collocation, used the power of the speaker is bigger than the power amplifier. This is a very common mistake!
In fact, continuous output power of the power amplifier value is less than the continuous output power of the speaker is easy to cause the destruction of the speaker. Because if continuous output power of the power amplifier, 100 w, speaker of the continuous output power 200 w. After the connection system, once the volume knob, around 100 w output power, power amplifier has been in a state of full capacity. The speakers still has a lot of allowance, once the user has to continue to increase the volume, then the output power than the power amplifier of continuous output power value, also is the moment when the distortion start producing! Distortion of what is known as the "clipping distortion", in the professional audio industry is called "speaker killer". The distortion of signal, even if the power is very small also can produce similar dc electrical signals, can be easily burned loudspeaker coil! For a continuous output power 200 w speakers, distortion rate of 50% of 150 w electrical signal is worse than 300 w signal without distortion.
So in the field of professional audio, keep the power amplifier "margin" is the important factors in the match system. Practice to ensure the continuous output power of the bass power amplifier output power continuously for the speakers of more than 2 times! In car audio, because the car's power extremely limited, each 1 w power is valuable, so to ensure the continuous output power of power amplifier slightly larger than the continuous output power of the speaker is the best choice. Don't let the continuous output the power amplifier to drive continuous output power is too small a great speaker. To do so, attention should be paid to control the volume, prevent the occurrence of clipping distortion!
Power amplifier is usually divided into full frequency power amplifier and bass special power amplifier. Bass special power amplifier in the signal frequency of 250 hz to ensure distortion is less than 1%. And when, after more than 250 hz frequency distortion has soared, the output power is reduced sharply. So don't try to use special bass power amplifier drive tenor and soprano speakers.
Full frequency power amplifier is usually USES the class AB amplifier design, power loss is larger. So the filter out low frequency signal, only promote the tweeter will be save power, the best choice to guarantee the quality.
As long as to master the equipment collocation principle, basic can guarantee the speaker and power amplifiers for safety state, and
To restore the pure without distortion.