Talking about the exchange of public broadcasting and professional audio equipment

[Audio Network Information]

Can I use a professional audio device to build a public address system or vice versa? The answer is yes, but not necessarily appropriate.

If you use a professional power amplifier instead of a broadcast power amplifier, you need to find ways to increase (or regulate) its output voltage. The methods are:

Choose a professional amplifier or amplifier combination (bridge or series) with the appropriate rated output power to achieve a constant voltage output (usually 100V) compatible with the broadcast speaker.

A suitable output transformer is connected to the output of the professional power amplifier.

The output voltage of a professional amplifier has the following relationship with its rated output power (Po) and rated load resistance (Rz):


Accordingly, the 2500W/4Ω professional power amplifier has exactly 100V output voltage and can be used directly. However, the total power of the broadcast speaker should not exceed 2500W (only considering the load capacity of the amplifier, and does not consider the requirements of the relevant regulations); on the other hand, no matter how small the total power of the broadcast speaker is, it is not possible to use a power amplifier with a small power, otherwise the broadcast cannot be guaranteed. The transmission voltage that the line should have. An output voltage close to 100V can also be obtained by bridging two 650W/4Ω professional power amplifiers. Obviously, when the total power of the broadcast speakers is much less than 2500W, it is not cost-effective to use the above method. If you want to use a power amplifier that is equivalent to the total power of the broadcast speaker, calculate its output voltage according to the above formula, and then connect the appropriate output transformer. However, the connection of the output transformer to the professional power amplifier can easily lead to the damage of the power amplifier, and appropriate measures need to be taken (here omitted).

Professional speakers can also be used as broadcast speakers, but must be equipped with "line transformers". As mentioned above, the "line-to-line transformer" acts as an impedance converter, enabling a "fixed-resistance" professional speaker to draw power equivalent to its own rating in a "constant voltage" broadcast transmission line. Without the "line transformer", several professional speakers can be used in series and parallel, but they can be used cumbersomely. In the course of operation, as long as one of the speakers is damaged, the system may be subverted (all not Ring or burn other speakers or burn the amplifier).

It is barely feasible to use a mixer as a broadcast preamplifier. However, the mixer usually does not have a signal priority ordering, which is not convenient for the "forced insertion" function necessary for the broadcast system.

In turn, broadcast amplifiers and broadcast speakers can also be used in professional audio systems. But because they all have built-in output transformers or line-to-line transformers, their frequency response characteristics are far less than those of professional amplifiers. Broadcast preamplifiers are also reluctant to use in professional audio systems because they do not have the functions of grouping, equalization, effects, etc., and their prioritization functions are mostly redundant for professional audio systems.

Therefore, it is not feasible to exchange equipment for public address systems and professional sound systems, although it is feasible. It usually leads to a deterioration in the performance price ratio.

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