I believe that all technicians are on site,
You will find that there is a selector switch on the rear panel of the amplifier.
You can choose three gears.
They are 0.775V, 1.0V, and 1.44V, respectively.
In a state where the input signal is constant,
Select the gear with the smaller value,
The greater the output power.
(Question...)
What does this value mean?
What is the value of this value?
We will interpret this important parameter today!
The values ​​corresponding to these three gears are the input sensitivity. Usually, without special labeling, this value defaults to the input sensitivity at 8 ohms.
What is the input sensitivity?
The amp input corresponds to the rms voltage corresponding to the nominal sensitivity. The amplifier output rms voltage (power) will be maximized without any attenuator enabled.
The switch points to 0.775V: usually represents the rms voltage of a 0.7KV 1KHz sine wave, and the amplifier output is 8 ohms and 800W. In this state, the power amplifier has a magnification of 103 times (voltage gain is 40 dB).
The switch points to 1.0V: usually represents the rms voltage of a 1KHz sine wave inputting 1.0V, and the output of the power amplifier is 8 ohms and 800W. In this state, the power amplifier has a magnification of 80 times (voltage gain is 38 dB).
The switch points to 1.44V: usually represents the rms voltage of a 1.KV 1KHz sine wave, and the amplifier output is 8 ohms and 800W. In this state, the power amplifier has a magnification of 56 times (voltage gain is 35 dB).
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to sum up
The application function of the input sensitivity selection switch is to change the amplification factor of the amplifier. It can be used in conjunction with the front panel attenuation knob or button discussed in the previous issue. The ultimate goal is to obtain the magnification you want, and to obtain the maximum in the state of minimum noise. Gain.
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Precautions
The marking of the power amplifier needs to be strictly measured. However, there are errors in the labeling and actual operation of some domestic products. It is recommended that the product be simply measured before use.
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The measurement method is: input the 0.2K, 0.5V, 1V 1KHz sine wave under the no-load condition of the power amplifier, measure the output voltage of the power amplifier, and then divide the output voltage by the input voltage to estimate whether the amplifier's nominal amplification factor is actual or not. Compatible.
There is some deviation between the power amplifier and the load, and the power amplifier has different deviations, but the deviation range will not have any impact on the system safety.
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