How to equip the constant pressure horn with the power amplifier to consider the impedance problem

There are two matching problems between the speaker and the power amplifier: the impedance of the power amplifier must be matched: the total impedance of the horn should be equal to the power amplifier impedance, at least the speaker shall not be less than the power amplifier impedance, which can be greater than the power amplifier impedance.

Otherwise, it is easy to burn the amplifier. The power of the horn must be matched: the power obtained by the horn should be equal to its rated power, not greater than, can be less than.

Otherwise, it is easy to burn the horn. Therefore, if all 4 8 speakers are connected to the amplifier in parallel, the impedance is only 2, and the amplifier will be burned; If two pairs are connected in series and then connected to the power amplifier, the overall is still 8, which is higher than the power amplifier impedance, and the power amplifier is safe, but the switch cannot be used to turn off one speaker alone, and if you want to turn it off, you must turn off two at the same time.

The more suitable scheme is 4 with two speakers in parallel, the impedance is reasonable when connected to the power amplifier, and the power is basically matched, and the impedance becomes 8 after turning off one, and the power obtained from the power amplifier will be reduced accordingly, so as not to overload. If there are 4 speakers, it must be turned off two, that is, only two can be turned on at the same time, and turning on more speakers will become the first paragraph above, which will damage the power amplifier. If you buy a power amplifier with 2 output impedance, the problem will be solved, or you can also solve the problem by switching to a 16 speaker, of course, using a line transformer (for constant voltage speakers) to match is also a solution, but the frequency response will be worse.

Constant voltage speakers are usually equipped with transformers, and power amplifiers can be equipped according to the value of the transformer, without considering the problem of resistance value;

It is best to match the power amplifier with the same resistance, but the power of the power amplifier should be greater than the power of the horn, at least it should be more than twice the power of the horn.

The 21-inch TV has very little power output. Most of the speakers used are magnetic speakers with a full range of less than 5 inches. This kind of speaker is not suitable for loudspeakers with large power audio.

Generally commercial** between 5 10 yuan, due to the small rated power and the characteristics of the full range, the sound is easy to produce cracked sound after opening up. The characteristics of the audio speaker are large caliber, coarse dynamic coil, and the sound of the large magnet pushed by the large amplifier is rigid and soft. The output impedance of the speaker is only one of the indicators, and there is no rated power.

The same goes for horns. It's like a van and a car. Although they are both cars, their load-bearing is completely different.

The TV can be used normally without speakers, because its low power will not cause the breakdown of no-load components. If you use a resistor to string a horn in ohm, you will find that the horn cannot make sound at this time, because the resistor becomes the real load, and the horn becomes the wire at this time. Besides, there doesn't seem to be a horn with ohmic impedance.

You may be using a normal tri-purpose meter to measure the DC impedance.

1. Differences in output forms:

Constant voltage and constant resistance are different in output form: one is voltage transmission and the other is current transmission.

Second, the characteristics of the constant pressure power amplifier:

In a constant voltage amplifier, if the rated load voltage changes, the power changes accordingly. 100V, 10W speaker connected to 70V becomes 5W (100V and 70V power difference doubled).

The domestic constant voltage standard is 120V and 240V

The foreign constant voltage standard is 70V and 100V

3. Characteristics of constant resistance power amplifier:

Power amplifiers with constant impedance outputs: These amplifiers require a constant impedance of the load. When the input signal is constant, the output voltage varies greatly with the load.

Fourth, the difference between the application of constant pressure power amplifier and constant resistance power amplifier:

The constant voltage is used in a large space that requires the sound quality is not very high, on the contrary, the constant resistance can only be transmitted within 100 meters due to the limitation of transmission, so it is generally used in a small space, and the sound effect is relatively better. Generally, the broadcast system uses a constant voltage output, and the audio system uses a constant resistance output.

The difference between constant pressure and constant resistance, I generally call constant pressure power amplifier and professional power amplifier (stage power amplifier), although constant pressure power amplifier is also professional. The two are mainly different design ideas (amplifiers and speakers) and different applications, take a look at the indicators and background indicators and products of the constant pressure amplifier.

Constant pressure power amplifier is a kind of power amplifier designed to increase the transmission distance, mainly used in the economic and common broadcasting system, such as schools, factories and other public places of the background and broadcasting, are transmitted in a constant voltage way. Its output mode is 100V 70V, the output of the ** signal is basically mono, in the optional speaker, the speaker is required to be connected to the interline transformer. There is no impedance matching required between the amplifier and the horn.

The background itself is not high on sound quality, and multiple speakers are scattered, and the convenience of wiring and transmission attenuation are the main contradictions, followed by sound quality.

After the output high voltage is converted into a low voltage push horn, it can reduce the loss of long-distance signal transmission. High-fidelity meetings should still use professional amplifiers and speakers, as for back-end fills, you can consider using constant pressure amplifiers and small boxes. Of course, there are advantages to using multiple speakers with constant voltage amplifiers

It is not easy to howl, and the sound pressure is relatively uniform.

Constant voltage speakers (that is, constant voltage speakers) are used in cable broadcasting, background **, high impedance, using constant voltage power amplifier drive, can be connected over a long distance, multiple can be connected in parallel, and the line loss is small.

Constant-impedance speakers, with a small resistance value of 8-16 ohms, are driven by constant-impedance power amplifiers, such as household power amplifiers and stage special power amplifiers.

It cannot be simply evaluated that the constant pressure horn is better or the constant resistance horn is better, according to the different uses and requirements, each has different applicable occasions.

If the sound quality is judged alone, the constant pressure speaker of the same grade will definitely lose to the given resistance speaker. The reason is simple, there will be a step-down transformer before the constant voltage horn, which will increase distortion.

Constant voltage horns are usually used in long-range broadcasting systems, and the advantage is that multiple speakers can be connected in parallel on the same line, because the voltage on the line is high, and long-distance low-loss transmission can be realized;

Constant impedance speakers are commonly used in close-range sound systems, where there is a strict limit on the number of speakers per line, and an increase in the number of parallel speakers will reduce the impedance and thus increase the amplifier load. For example, if an amplifier with an output impedance of 4 ohms can be connected in parallel, at most two 8 ohm speakers can be connected in parallel, and if it is a 4 ohm speaker, only one can be connected in parallel.

For background systems, if there are a large number of horns, it is best to use constant voltage, which can greatly reduce wiring and maintenance costs;

If you have high requirements for sound quality and the number of speakers is not too much background** system, it is recommended to choose constant impedance speakers and multi-channel constant impedance amplifiers.

Ceiling horns have constant pressure and resistance. You use 7 recommendations to use constant pressure. It would be nice to have a little more power than all the speakers combined.

The sum of the power of the constant voltage horn is not greater than the power of the constant voltage power amplifier, usually the power of the power amplifier is about twice the power of the horn is the best!

The small venue of 150 square meters is better in the way of constant resistance, because: 1. The wire is short, the line resistance is small, and the inter-line transformer is omitted; 2. The constant resistance power amplifier is generally two-channel, and the sound quality is better than that of the constant voltage power amplifier.

As for the speaker problem: the total power of the speaker should be basically matched with the power amplifier, and the impedance should be matched with the power amplifier by connecting it in series and parallel. Of course, the speaker should also be low-impedance.

Summary. Sorry, I've kept you waiting, I'll answer for you, the constant voltage power amplifier is a broadcast audio power device with high voltage (120V, 240V) output, suitable for long-distance broadcasting, but the sound quality is not as good as the fixed resistance power amplifier.

Some constant voltage power amplifiers have a constant impedance output terminal at the rear, which can be directly connected to a constant impedance speaker. For the constant voltage power amplifier without constant resistance output terminal, it is necessary to connect the corresponding power interline transformer first, and the secondary connection of the interline transformer is the constant resistance speaker (speaker).

Kneel and ask the master for advice: Can the constant pressure power amplifier be equipped with a fixed resistance horn?

Sorry, I've kept you waiting, I'll answer for you, the constant voltage power amplifier is a broadcast audio power device with high voltage (120V, 240V) output, suitable for long-distance broadcasting, but the sound quality is not as good as the fixed resistance power amplifier. Some constant voltage power amplifiers have a constant impedance output terminal at the rear, which can be directly connected to a constant impedance speaker. For the constant voltage power amplifier without constant resistance output terminal, it is necessary to connect the corresponding power interline transformer first, and the secondary connection of the interline transformer is the constant resistance speaker (speaker).

Summary: Yes, but a line transformer may be required. Constant resistance horns are also rated voltage:

U= pz, for example, the rated voltage of the horn of 16 25W is 20V. Of course, it may not match the voltage of the constant voltage power amplifier, but as long as the "line transformer" is used, it can be converted into a suitable voltage, so it is usually a constant voltage horn = transformer + constant resistance horn.

Hello, are constant pressure and constant resistance speakers the same?

To put it simply. Constant pressure is suitable for long distances and poor sound quality. Constant resistance is suitable for close range, **good.

Is Hello a kind of speaker?

No, dear.

The constant resistance speaker does not add an interline transformer, the impedance is generally 4 ohms, 8 ohms, and the direct use of the occasion is generally the radio, the recorder, if the crossover circuit is added, it is generally used in the speaker, so it is generally connected with the home amplifier, KTV amplifier;

The constant voltage speaker is to add an interline transformer at the front end of the speaker, and the function of this transformer is to convert the broadcast voltage of 120V or 240V into the voltage suitable for the work of the speaker, so the constant voltage speaker is suitable for connecting with the constant voltage power amplifier (amplifier) and is widely used in cable broadcasting occasions for long-distance transmission;

I hope mine is helpful to you and have a great day!

Constant pressure horn and constant resistance horn are common devices in audio systems, and they have different working principles and characteristics.

1. Explanation of terms

Constant pressure horn:A constant pressure horn is an acoustic device that is used to amplify the audio signal and

Provides a constant sound pressure level. It produces sound by converting electrical audio signals into mechanical vibrations. The main feature of a constant pressure horn is its ability to maintain a relatively constant sound pressure level over the frequency response range.

This means that the constant pressure horn can provide the same sound pressure level output regardless of the frequency variation. It is often used in applications where a consistent sound pressure level is required, such as PA systems, audio amplification in public places, etc.

Constant pressure horn. 2.Constant impedance horn:

FixedA speaker is also an acoustic device that is used to amplify an audio signal and provide a constant impedance. Impedance refers to the degree to which a speaker obstructs the current current, which can affect power transmission and audio quality. Constant resistance speakers are designed to maintain a relatively constant impedance value to ensure that the audio signal is transmitted evenly across all frequencies.

By maintaining a constant impedance, the constant impedance horn can provide stable power transmission and better sound quality. It is commonly used in applications such as professional audio systems, performance venues, etc.

Constant resistance ceiling horn.

2. Differences:

How it works: A constant pressure horn achieves its design goals by keeping the sound pressure level constant, while a constant resistance horn achieves its design goals by keeping the impedance constant.

How directional horns work.

How directional horns work.

2.Features: Constant pressure horns are suitable for applications that require consistent sound pressure levels, while constant resistance horns are suitable for applications that require stable power transmission and good sound quality.

3.Application scenarios: Constant pressure speakers are often used in audio amplification in broadcasting systems and public places; Constant resistance speakers are often used in professional audio systems, performance venues, etc.

School playground constant pressure tweeter.

The application of ceiling fixed resistance speaker in the cracked audio room.

3. Summary

In conclusion, constant pressure horns and constant resistance horns have different design principles and applications in audio systems. Constant pressure horns work by maintaining a constant sound pressure level, while constant resistance speakers maintain constant impedance, and they are suitable for different audio needs.

Constant pressure horns and constant resistance horns are two different types of speakers that differ in their use and characteristics.

1.Voltage-driven loudspeaker:

The working principle is a kind of voltage-driven speaker, which acts on the speaker coil through an external voltage signal to produce a change in the magnetic field and drive the speaker to vibrate, thereby producing sound.

Features: The characteristic of the constant voltage horn is that the input voltage determines the output sound volume. Regardless of the size of the resistance to which the speaker is connected, the output sound volume does not change as long as the voltage remains constant. Its output sound is voltage-controlled, independent of the load impedance.

2.Impedance-driven loudspeaker:

Working principle: The constant resistance horn is a resistance-driven alarm balancer, and the resistance of the coil is fixed. By connecting to equipment such as power amplifiers, an electric current flows through the speaker coil, creating a change in the magnetic field that drives the speaker to vibrate and produce sound.

Features: The characteristic of the constant resistance horn is that the input current determines the output sound volume. Since the coil resistance is fixed, the magnitude of the output sound is related to the input current intensity, and therefore the output current intensity and load impedance of the current source.

Main differences: Driving mode: The constant voltage horn is a voltage-driven speaker, and the output sound volume is controlled by the input voltage; A constant impedance horn is a resistor-driven loudspeaker whose output sound is controlled by the intensity of the input current.

Output control mode: the output sound of the constant voltage horn is controlled by voltage, which has nothing to do with the load impedance; The output sound of a constant resistance horn is determined by both the current intensity and the load impedance.

In practical applications, according to the specific needs and usage scenarios, choose the appropriate speaker type to get the best audio effect and sound performance.