What is the impedance of a horn? Thanks for the guidance

Impedance refers to the ratio of voltage and current of the input signal of the car speaker, and its unit is ohm ( ) In layman's terms, the impedance is the resistance of the car speaker to the current, and the impedance is not equal to the resistance, but includes resistance and reactance, that is, including resistance and inductance, and the inductive and capacitive reactance produced by the capacitor, which is the sum of the three in the vector.

At the same voltage, the higher the impedance, the smaller the current, and the lower the impedance, the greater the current. Under the condition that the power amplifier and the output power are the same, the low-impedance car speaker can obtain a large output power, but if the impedance is too low, it will cause underdamping and bass degradation. In general, the lower the impedance of a car speaker, the harder it is to push.

The impedance is not a constant value, but constantly fluctuates with the frequency of **, which may be as high as a dozen ohms or twenty ohms at a certain frequency, or as low as one ohm or less at a certain frequency, and is generally used as its nominal value as the lowest impedance value between the resonance peaks at its resonant frequency. Currently, the impedance of most car speakers is between 2 and 8 ohms. The preferred value of speaker impedance stipulated in China's national standard is (the recommended value of the international standard is 8).

When purchasing car speakers, we must also pay attention to the impedance matching with the car power amplifier, that is, its impedance should be within the load impedance range of the car power amplifier, only in this way can the car power amplifier work safely and provide the most ideal power output.

The greater the resistance of the horn, the greater the power. SpeakersImpedanceThe difference between large and small, the requirements for power amplifiers are different. For example, the power amplifier outputs a maximum of 80W power and outputs 4-8 ohm speakers.

According toOhm's LawThe maximum 80W is the output under 8 ohm conditions, if the external 4 ohm speaker, the maximum output is only 40W power, so the smaller the impedance of the speaker, the greater the power requirement for the power amplifier.

General home audio, choose 4 ohms, 6 ohms, 8 ohms, the wattage is between 30-80W, if the audio power is too high, it is necessary to be equipped with a higher-end power amplifier, the cost is much higher, and the wire is also high, such as 4 Euro 100W audio, at least 4 square wires are needed, the cost is not low.

There are some misinformation on the Internet, such as 4 ohms more power than 8 ohms, and the amplifier is simpler to push. In fact, most of the home power amplifiers are now fixed-impedance design, and it is more difficult to push the low impedance of the speaker. In addition, speaker impedance has little to do with sound quality performance, such as high-end speakers, there are 8 ohms or even 12 ohms, and there are also 2 ohms or 6 ohms, impedance is an electrical characteristic, not a reflection of sound quality.

Resistance is a parameter (for amplifier) and is independent of power. For example, 8 ohms 20w, 4 ohms 100w, there are also 8 ohms 100w, 4 ohms 20w. The sound volume mainly depends on the power.

Of course, the same power of the horn, the resistance value is different, connected to the power amplifier, it will be different. For example, if you have a 4-ohm amplifier and a 4-ohm speaker, you will usually have a smaller sound (the volume will be turned on to the same position).

8 ohm power amplifier, connected to 4 ohm speaker, the sound will be louder (and easy to burn the power amplifier) because the output power will be doubled (some kind of circuit).

The greater the resistance of the horn, the greater the power.

It refers to the ratio of voltage to current of the speaker's input signal. The input impedance of the speaker is generally divided into two categories: high impedance and low impedance, and the standard impedance of the speaker is 8.

It refers to the ratio of voltage to current of the speaker input signal, which is also related to physics, simply put, the resistance of the car speaker to the current.

This means that the resistance of the speaker to the current is the ratio of the voltage and current input to the speaker.

This means the ratio of voltage to current of the speaker's input signal.

The bass will be louder and the treble will be smaller.

Impedance of the horn meaning:

Impedance refers to the ratio of voltage and current to the input signal of a vehicle's loudspeaker, measured in ohms.

In layman's terms, impedance is the resistance of the car speaker to the current. Impedance is not equal to resistance but includes resistance and reactance.

That is, it includes resistance and inductance, inductive reactance, and capacitive reactance from capacitance.

The three parts are the sum of these three in the vector.

At the same voltage, the higher the impedance, the smaller the current, and the lower the impedance, the greater the current. in the power amplifier.

A low-impedance car speaker can achieve a large output power with the same output power, but an impedance that is too low can lead to underdamping and bass degradation. Generally, the lower the impedance of the car speaker, the more difficult it is to push.

The impedance is not a constant value, but fluctuates with the frequency of ****, which may be as high as ten ohms or twenty ohms at a certain frequency, and as low as one ohm or less at a certain frequency. Generally, the lowest impedance value between the resonant peaks at the resonant frequency is used as its nominal value.

Speakers have impedances, and the impedance standard of speakers is lower than 1000 Hz.

Detect amplifier impedance:

1. The impedance of the power amplifier can only pass through the signal generator.

and an oscilloscope. Pei Ye Mo.

1. First of all, you need a 50Hz signal source. Put it with a slow megaphone.

Take it off and change it to a resistor.

The input is connected to the signal, multimeter.

Dial in the AC voltage range and measure the voltage of the resistors at both ends.

2. Connect another resistor with the same resistance, connect it in parallel with the previous resistor, and then measure the voltage at both ends. The voltage of the second time must be lower than that of the first. If the difference is too small to be seen, connect 3 resistors in parallel.

3. Calculation method, resistance r and the band of U1 and U2 of the first measurement of voltage.

The second voltage measurement is: i1 u1 u2 0 5 ri2rro δu δi (u1,u2) (i2 i1) r (u1,u2) (2u2 u1).

RO is the output impedance of the amplifier. If it is in 0 1 audio power amplifier.

Output impedance is a complex impedance and signal frequency, power supply voltage and load characteristics, ambient temperature changes and variations.

Multimeter. Use a multimeter to make a difference. Put the multimeter in R 1 gear, after zeroing, measure the resistance of the coil, the resistance value is, multiply this value to the obtained value, indicating that the impedance of the tested speaker is 8.

The impedance curve of the horn is divided into chains

1. F0 resonant frequency, impedance curve at a glance, roughly understand the degree of diving of this speaker, but this F0 is not the lower the better, and some F0 low speaker booths are not as good as F0 high speakers. The degree of convex impedance curve, I probably think that the subwoofer type speaker will be more convex and the full-range horn will be lower. Horns with high protrusions are comparatively more difficult to navigate.

2. It is best if there are no twists and turns in the middle section, there must be peaks and valleys if there are twists and turns, or there is a problem with the horn.

3. The high-end frequency response of the speaker is basically cut off at the nominal impedance of the times, for example, a speaker is 8 ohms, and the corresponding frequency of about 20 ohms is his highest frequency. Look at those horn trebles that are very upturned and definitely not good.

4. The short-circuit ring is a sharp tool to enhance the high frequency, and the high section of the speaker impedance curve with the short-circuit ring will be very flat, but it is no problem to listen to the opinions. The ordinary 3-inch LG speaker is more suitable to say that it is midrange, and it is not considered full range. The 5-inch full-range speaker of the collection of the pioneer of old goods, the sense of hearing is good, the frequency is wide and there is no group, the aluminum frame with the short-circuit ring silver flute 5-inch mid-woofer, the impedance peak is a little sharper, a 4-inch full-range speaker from Taiwan, the sense of hearing is also good, and it also has a short-circuit ring.

In circuits with resistance, inductance, and capacitance, the impedance that acts as a hindrance to the current in the circuit is called.

The impedance is commonly represented by z, which is a complex number, the real part is called resistance, and the imaginary part is called reactance, in which the obstructive effect of capacitance on alternating current in the circuit is called capacitive reactance, the obstructive effect of inductance on alternating current in the circuit is called inductive reactance, and the obstructive effect of capacitance and inductance on alternating current in the circuit is collectively called reactance. The unit of impedance is ohms. The concept of impedance exists not only in electrical circuits, but also in mechanical vibration systems.

In audio equipment, impedance is an important parameter that is often mentioned. For example, the impedance of the amplifier and the horn is mostly designed to be 8 ohms, because at this impedance value, the machine has the best working condition. In fact, the impedance of the speaker changes with the different frequencies, and the speaker specifications are usually marked with a rough average value of the bucket, and most of the products on the market are four ohms, six ohms or eight ohms.

Given that you are an "engineer specializing in measuring loudspeakers", we have to explain it slowly, although it is not scored, it is really unbearable to watch.

First of all: to understand a concept, sound is not the same as speakers.

Audio is a general term for equipment including signal sources, audio processing equipment, amplifiers, speakers, etc., and the speaker is just a device used for electroacoustic conversion in the audio system.

Let's get to the bottom of another concept: impedance is not equal to resistance.

Impedance: Note the difference between the meaning of resistance and resistance, in the world of direct current (DC), the effect of an object on the current resistance is called resistance, but in the field of alternating current (AC), in addition to resistance will block the current, capacitance and inductance will also block the flow of current, this effect is called reactance, and what we call impedance is the sum of resistance and reactance in the vector.

Secondly, the impedance of the horn.

It refers to the ratio of the signal voltage u of the speaker input to the signal current (this is the same as in junior high school physics, r=u i). These include: nominal impedance and DC impedance.

Unit: ohm), DC impedance DCR: refers to the impedance value measured by the DC signal when the voice coil coil is stationary.

What we usually call 4 ohms or 8 ohms is an indicator called impedance. Since the impedance of a loudspeaker is a function of frequency, the magnitude of the impedance value changes with the frequency of the input signal. China's national standards stipulate that the preferred value of speaker impedance is (the recommended value of the international standard is 8), and the nominal impedance of the speaker is specified as:

The lowest impedance value between the peak f0 of the loudspeaker's resonant frequency and the second formant f1. Some foreign speaker manufacturers set the nominal impedance of the speaker as a section where the impedance characteristic curve tends to be flat.

Let's talk about the impedance of the speaker:

The speaker is a composite of a plurality of speakers and a crossover circuit plus a cabinet, the nominal impedance of the speaker is different from the nominal impedance of the speaker, because there is more than one speaker unit in the speaker, and the nature of each unit is not the same, and there is also a series or parallel crossover network, so the standard stipulates that the minimum impedance shall not be less than 80% of the nominal impedance value.

The impedance of the speaker is not the result of the direct measurement with the ohmmeter as stated on the 1st floor,It is only the DC resistance that you can measure,The resistance value measured by this is not the resistance of the speaker,It is the DC resistance of the inductor coil and the woofer in the crossover circuit,The tweeter of the speaker is blocked by a capacitor,Due to the direct intersection characteristics of the capacitor,Measured with the ohmmeter on the 1st floor is actually equivalent to not calculating the tweeter。 The impedance of a loudspeaker is for the audio signal, not for the resistance generated by the passage of DC current.

Generally speaking, there are multiple speakers for a speaker, such as: one 8 ohms, one 4 ohms, so that the impedance of the two speakers in parallel is: ohms, generally nominal 4 ohms, which conforms to the --- minimum impedance shall not be less than 80% of the nominal impedance value.

The power is 25W, the impedance is 4 ohms, and the input voltage is equal to 10V, so you have to ensure that the speaker is in full power and is input by a single frequency?

The impedance of the speaker is the impedance of the speaker. It can be measured with an ohmmeter. The power amplifier of the audio also has impedance, which is marked and cannot be easily measured.