1. The rated voltage of constant pressure ceiling speakers is certain. The speakers of the constant pressure system are connected in parallel. As long as the total power of the speakers does not exceed the total power of the constant pressure power amplifier, many ceiling speakers can be connected. Building speakers. As long as it does not exceed the total power of the amplifier.
2. The constant resistance ceiling speaker needs to be matched with the output impedance of the constant resistance power amplifier, and the load resistance of the constant resistance system is certain. In a constant resistance power amplifier, if the load impedance changes, the power changes accordingly. 8 ohm 100W constant resistance power amplifier connected to 4 ohm becomes close to 200W. The constant resistance power amplifier is connected to the fixed resistance ceiling speakers, which cannot be increased arbitrarily, and can only be increased after calculation by professional engineers.
2. Application places of constant pressure loudspeaker and constant resistance loudspeaker:
1. Constant pressure audio is mainly used in public broadcasting in public places, campus broadcasting, and background music systems. The constant voltage power amplifier adopts high voltage and low current output, and the line loss is small. The distance between the public broadcasting speaker and the power amplifier can be farther, and a power amplifier usually needs to be connected to multiple low-power speakers.
The constant pressure broadcasting system can reduce the line loss and prevent the opening or closing of a speaker in the system from affecting the volume of other speakers. The constant pressure broadcasting system power amplifier can be connected to multiple speakers, as long as the speakers are connected in parallel on a common wire.
2. The constant resistance system is mostly used in conference audio, home background music, home theater, KTV, stage, etc. Home background music, home theater, stage and other speakers are relatively close to the power amplifier, and there is no need to connect a lot of speakers. At the same time, home background music, home theater, and professional audio have higher sound quality requirements. What is important is the sound effect. The sound is amplified through the power amplifier. The final mixing thickness and clarity are the hard indicators of the entire sound system. The constant resistance power amplifier adopts high current and low voltage output, and the connection of the power amplifier and the sound response selects a dedicated speaker line.
3. The sound quality difference between constant pressure speakers and constant resistance speakers
Constant pressure speakers are used in large spaces where the sound quality is not very high. On the contrary, constant resistance can only transmit within 100 meters due to transmission limitations, so the sound effects are generally better when used in small spaces. Because the constant voltage amplifier uses a transformer on the circuit, its sound quality is affected to a certain extent. However, if you choose high-quality broadcast speakers, you can completely improve the sound quality of the broadcast system.
3. Matching characteristics of constant resistance sound system and constant pressure sound system:
A simple understanding of constant voltage power amplifier is to drive the speaker with voltage. Its characteristics are that the output voltage is large and the current is small; the constant resistance power amplifier uses current to drive the speaker. , you can't even hear it; the power amplifier of constant pressure is connected to the speakers of constant resistance, and the speakers are burned.
Speaker size and sound effects:
The larger the diameter of the speaker unit's diaphragm, the larger the volume of air pushed, and the more obvious the sound pressure; in short, it is easier to excite the air, giving people a feeling of airflow impact. The low frequency response will be better, and the sound felt by the human ear will be better. Of course, it must be matched with the power amplifier, power and so on. The larger the magnetite, the stronger the magnetism. The stronger the magnetism, the more efficient the speaker will be at the same power received, the louder it will be, and the more controllable it will be!
Coaxial speakers:
In general speakers, the tweeter and woofer are arranged on the panel of the speaker, so their sounding centers cannot coincide at a point. In this way, the distance between the tweeter and the bass reaching the listener will be different, and this difference will lead to The phase deviation thus affects the correct restoration of the sound image. The coaxial speaker uses a coaxial unit, which is actually a combination of a tweeter unit and a woofer unit. , thus solving the problem of phase deviation.
Crossover speakers:
The frequency divider is the "brain" in the speaker, which is used to separate the input music signal into different parts such as treble, midrange and bass, and then send them to the corresponding high, medium and woofer units for playback. The frequency divider can be divided into two, three and four frequency division according to the frequency division frequency band. Two-frequency division is to divide the entire frequency band of the audio signal into two frequency bands, high frequency and low frequency; Ultra low frequency.