The collocation of car audio power amplifier and speakers

Author:　News Source:　Click：　Update Time：2007-09-07

Car audio between various devices need to be carefully selected to match the best results.

A car stereo power amplifier and speakers, for example, the two only do impedance matching, power matching, frequency matching can ensure the safe operation of equipment, and to fully exploit the greatest potential.

[Impedance matching]

Cast aside the boring theoretical knowledge, the simple explanation is able to withstand a range of power amplifier impedance speakers. Is only connected to the amplifier's speaker impedance in this context, the power amplifier in order to secure work and to provide the best power output!

Different models of power amplifiers can withstand the impedance is different. For example: Alpine MRV series of power amplifier rated impedance is 4 ohms (each way 4 ohms), MRD series of power amplifier rated impedance is 2 ohms.

[Power matching]

We are conducting power matching, we must first figure out is usually a nominal power of the two kinds of indicators: maximum power and continuous output power (RMS).

有很多品牌的功率放大器和揚聲器習慣最大功率評判設備的優劣。 In fact, this is very scientific evaluation methods. The nominal maximum power does not take into account distortion cases, the equipment in a very short time (usually only a few milliseconds) does not occur within the physical damage or electrical damage of the power value.

Continuous output power (RMS) is does not produce distortion in the circumstances, the work can be sustained and stable power. Only this can truly reflect the value of equipment working state.

通常很多人可能會導致揚聲器線圈燒毀的主要因素是功率放大器的功率比揚聲器大造成的。 So a device with the time, custom speaker amplifier power than the big. This is a very common misunderstanding!

In fact, the amplifier's continuous output power value is less than speakers of continuous output power is most easily lead to the destruction of speakers. Because if the amplifier's continuous output power 100W, speaker of continuous output power 200W. When the connection system, once the adjust the volume knob, the output power at around 100W, the power amplifier operating at full capacity already in the state. The speakers have a lot of headroom, if users continue to increase the volume, this time the output power exceeds the power amplifier output power of the continuing value of, which is beginning to have a time distortion! This distortion is called "clipping" in the professional audio industry known as the "speaker killer." This distortion of the signal, even if the power of a small can also produce similar DC electrical signal, can be burned easily coil loudspeaker! For a continuous output power 200W speaker, the distortion rate of 50% of the 150W signal than the signal without distortion 300W is more terrible!

Therefore, in the professional audio field, to maintain power amplifier, "cushion" the system with an important factor. Practices to ensure the sustained bass amplifier speaker output power of continuous output power of 2 times more! In the car stereo, because the car's power is extremely limited, each 1W power is valuable, so to ensure the continued power amplifier output power slightly greater than the speaker of continuous output power is the best option. Do not let too small continuous power continuous output power amplifier to drive a great speaker. As a last resort, when doing so, we must pay attention to controlling the volume to prevent clipping distortion occurs!

[Frequency matching]

Power amplifier is usually divided into full-band power amplifier and the dedicated bass amplifier. Dedicated bass amplifier in the signal frequency of 250Hz for the following to ensure that distortion is less than 1%. When the frequencies above 250Hz, the distortion rose sharply, the output power are suddenly reduced. So do not attempt to sustain and promote the bass amp dedicated tweeters.

Full-band Class AB power amplifier is usually used to enlarge the design, power consumption is relatively large. So, to filter out low frequency signal, only to promote the tweeter would be to save power, ensure the best choice for sound quality.

As long as the master device with the above-mentioned principle, the basic guarantee for the security status of speakers and amplifiers, and can restore a pure sound without distortion.