How to choose the difference horn speaker between constant voltage and constant resistance in broadcasting systems in various applications?

In fact, the difference between constant voltage horn speaker and constant resistance speaker horn mainly lies in the difference in output form and application:


1. The difference between constant voltage and constant resistance in output form: We know that the output voltage does not change with the change of impedance value, so the number of amplifiers connected within the range of system power generally has no effect on the overall voltage of the amplifier. Generally, when selecting a constant voltage combination, in order to reduce line loss during transmission, it is necessary to use it in conjunction with a constant voltage PA loudspeaker (with a transformer inside), We know that the higher the voltage, the smaller the transmission line loss, and so is the transmission of our electricity.


In broadcasting systems, the common output voltages include 70V, 90V, 120V, etc. The rated voltage of the load is required to be constant. The constant voltage amplifier and multiple constant voltage speakers are connected in parallel, and the total power of each speaker cannot exceed the total power of the constant voltage amplifier. If the rated load voltage changes, the power will also change accordingly.



Fixed resistance power amplifiers generally require a certain output load resistance value, otherwise if the load impedance changes during use, the power will change accordingly. For example, if a 10 ohm 100W fixed resistance power amplifier is replaced with a 5 ohm overall power consumption, it will become close to 200W.



2. The difference between the application of constant voltage and constant resistance: Constant voltage is generally used in situations where there is not a high requirement for sound quality, but the transmission distance is relatively long; On the contrary, fixed resistance limits the transmission distance to within 100 meters, and is used in situations where the transmission distance is relatively close and there is a high demand for sound quality. So the broadcasting system is more commonly used for fixed voltage amplifier sound combinations, while fixed resistance amplifier sound box combinations are more commonly used in conference systems.

There must be many friends who are curious here, but can the two be mixed up? Can I use a constant voltage amplifier with a constant impedance speaker? Actually, it is also possible, but it is not recommended to use this combination as it not only affects the sound quality, but also the lifespan of the device. Just like when I put the wheels of a motorcycle on a bicycle, it can still run, but the stakes are clear. We advocate for dedicated personnel, so it is usually used in conjunction.

The above are some explanations and applications that have been extended to address the differences between constant pressure and constant resistance. I hope they can help you!