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Elements of sound reinforcement system design and practice (2) (PDF download)

In Electronic Infomation Category: E | on April 22,2011

3) explain why the sensitivity selection switch when the amplifier when the amplifier is 26 dB is 20 times magnification. Remember 20lg (voltage gain) = voltage gain, voltage gain = output voltage / input voltage. 20 (26 dB), 40 (32 dB), 64 (36 dB), etc. These values ??are computed from this.

4) Figure 2 is a QSC RMX4050HD power amplifier input gain reduction knob.


Figure 2 QSC RMX4050HD power amplifier input gain attenuation knob

Fact, they see the input gain reduction knob to already know the voltage gain amplifiers. 20lg (voltage gain) = 36 times the voltage amplification factor = 63.1 64 times, view the user manual that the station did not choose the amplifier input sensitivity switch, is fixed at 1.25 V. Knowing this fact, do not look at the instructions on the output power can be calculated. QSC RMX4050HD power amplifier voltage, that is, 8 load impedance, the amplifier output power of 800 W; then 1.6 coefficient shows 4 load impedance, the amplifier output power of about 1 280 W; bridge power can be multiplied by 3.2, which is about 2 560 W (8 ).

Last match in the manual about using the technical parameters, see Table 2.

Table 2 corresponding to the input sensitivity of the input level clipping

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