·broadcast wire optional cross-reference table

Note: 1, when the load evenly distributed, the voltage is within 20% of the maximum attenuation (since the wire back line calculation), or an average sound pressure level attenuation-2dB, multi-stranded copper wire core wire, such as RVV 2x 2.0mm2 (RVVP said shield )

Radio amplifier selection

       Optional radio amplifier, with 70V and 100V constant voltage output or fixed resistance (4 to 16 ohms). Broadcast line usually can be short or long. For low-power amplifier impedance output, must be equal to the total impedance 4 ohms. Taking into account the speaker impedance matching. Require large attack rate for broadcasting equipment to combine high power amplifier radio amplifier used.

Radio amplifier rated output power should be used in much the rated output power, subject to the total power radio speakers that power depends on the size of the partition to be broadcast. For broadcasting system, as long as the total power radio speaker amplifier is less than or equal to the rated power, and the same voltage parameters, you can freely connected with, but considering the line loss, aging and other factors, the power should be properly left margin.

According to background music and broadcasting system functions needed radio amplifier rated output power should be about 1.3 times the total power radio speaker. However, all public broadcasting system should in principle be able to make an emergency broadcast disasters. Therefore, the system shall be provided with an emergency radio amplifier. For broadcast region-wide alarm system, emergency broadcast system amplifier rated output power should be> = 1.5 times the total power radio speaker set.

The total amount of usually 1.5 to select a speaker amplifier.

The above parameters are recommended for the conservative argument, try to advise clients to use these provisions in the above range of devices and wire