Differentiation of regulation and resistance in broadcasting system

The sound system speaker speakers in the recently been done are all selection, then what is the difference between deflation and compression?


Many friends have a lot of power amplifiers used in public broadcasts and professional audio, and we have talked about the compression and restraint power.

Common: Both audio signals from computers, CD, DVD, etc., and promote speaker work.

Each feature:

One: Tailor power amplifier

1 is used in public applications

2 mono output

3 high voltage low current output

The regulation is mainly used in public broadcasts in public applications, and is also applied to the background music of the family. Because public broadcasts and background music system speakers and amplifiers are far, and a power amplifier typically connects multiple small power speakers. In order to reduce the line loss, avoiding an impact on a speaker in the system on or off the volume of other speakers, so the calorific power is high voltage low current output [relative]. The regular connection is multi-speaker, as long as the speaker is in parallel on a normal wire.

Since the regulator is used on the circuit, the sound quality is affected. However, if you select a high quality broadcast speaker, you can use the sound quality of the system.

2: Resistance power release

More used in home theater, KTV, stage

2. Stereo output

3. Low voltage high current output

Because the home theater, the distance between the stage is relatively close and there is no need to connect a lot of speakers, so the setup power generation current low voltage output, connection amplifier and sound should be used with dedicated audio cables.

Here is the characteristics of broadcast speakers:

Now there is a linear transformer inside the multi-broadcast speaker, so there is no need to install the transformer when used.

The queuing speakers used in broadcast can be in parallel.

Broadcast speaker power is generally smaller

Supermarket’s ceiling speaker power at 3W-10W

Wall-mounted speed in the classroom at 3W-10W

Outdoor broadcast pitch power at 10W-100W

The power of the treble horn is 5W-25W

Declab loud box power is generally large

The main box power of the home theater is 80W-300W

KTV’s speaker power at 80W-300W

The power of the stage speaker is 200W-1000W

It is best not to use multiple parallel speakers.

So how do you distinguish between defensive and registering speakers? How to distinguish between blocking power plants and regulation?

The labeling voltage of the speaker is a fixed splitter, and the tabular resistance is a set speaker. Generally, the slave is more common.

Rear defensive power placed and the defensive power display power amplifier, the output terminal labeling resistance is the defensive power amplifier, the output terminal label voltage is the correction power amplifier, and now most of the main pressure amplifier has a defensive output function, so the back output There is also a label resistor with the label voltage.

First, the difference in the output form:

The regulation and defensive is different in the output form.

1. The regulation is not a voltage, but the output form is a regular pressure, which requires the rated voltage of the load. The regular power amplifier is connected in parallel in parallel, as long as the total power does not exceed the total power of the regulation.

2, the defensive function is required to output the load resistance. If the load impedance changes in the constant resistance, the power is changed. 8 ohm 100W is set to 4 ohms to be close to 200W.

Second, the characteristics of the registration amplifier:

In the regular power amplifier, if the rated load voltage changes, the power changes accordingly. 100V, 10W speakers are connected to 5W (100V and 70V power difference) on 70V.

Domestic compression standards are 120V, 240V counter-pressure standard is 70V, 100V

Third, the characteristics of the blocking power release:

Power amplifier output for alation: This type of amplifier requires a constant impedance of the load. When the input signal is constant, the output voltage varies greatly with the load change.

Power amplifier of the regular output: Since the deeper negative feedback apparatus is used in the amplifier, this deep-negative refund feedback is generally 10 ~ 20 dB, and therefore, the output impedance of the amplifier is low, and the load is changed within a certain range. Its output voltage still maintains a certain value, and the sound quality can remain unchanged.

Fourth, the default power amplifier application difference:

The regulation is not very high space required to require sound quality. It is precisely that the restriction of the transmission can only be transmitted within 100 meters, so it is generally used in the small space. General broadcasting system uses a regular output, the sound system uses the defensive output

I often listen to some users. It is a good power amplifier, but I can’t even hear it. In fact, this problem is in the industry, it should be a combination of resistance. Set the spinning box. The general user may not understand this, thinking is that the power amplifier and speaker can not be used? In fact, this is because the amplifiers and speakers are divided into pressure and defensive. If the mess, not only does not use normally, sometimes even burnt the speaker.

Does the caliper power supply to the blocking box? Does the resistance to the power supply box?

Then how do we have to distinguish between fixed pressure and deactivation power? Here, in order to let the non-industry people understand that I will explain the most popular words. The simple understanding of the calorimulator is to drive the speaker with a voltage. Features: output voltage is large, small current; broadcast equipment

It is the AV amplifier of the general home, which is to drive the speaker with current: the current is large, the voltage is small.

Why is the sound of the stack to put the roll box sound? Because there is an impedance converter (transformer) inside the regulator, the principle of the transformer used is exactly the principle of the transformer, stick to the large voltage small current to change the main current small voltage principle, and then push the speaker, but because the power discharge voltage is small, the optical current It’s not good to make (without sticking to the principle of transformer), so there will be a small sound or you can’t listen. The problem is then well understood about the speaker of the calibration of the power-saving, and the sound of the speaker (not necessarily burning the speaker) is very well understood. The chance of the high-voltage power-placed small voltage speakers is certain (the current is small, but there is current) .

It is not to say that the principle is simple to conclude:

1, the stack is placed in the fixed spinning box, but there is sound but small.

2, the regulation is set to the quoing box, the pressure amplifier power is small, not burning the speaker, but the speaker will not work properly; the pressure amplifier power is burn bad speaker.