In daily application, many practitioners mistakenly believe that,
Professional dual-channel and multi-channel power amplifier products
front-panel analog attenuation knobs,
Digital Progression Attenuation Button
is to reduce the output power!
but it is not the truth!

The attenuation knob on the power amplifier panel changes the amplification factor of the power amplifier, not the output power. Therefore, no matter where the attenuation knob of the power amplifier is attenuated, the power amplifier may output the maximum power.
These parameters represent how many magnifications the power amplifier knob attenuates (where the attenuation knob or button reaches), without reducing the maximum power output of the power amplifier.

For this, we need two valid parameters:
①. Calculate the maximum output voltage from the RMS output power at the nominal impedance.
②. Find the maximum allowable input voltage of the power amplifier product in the data.

①. Through the formula (input voltage = √power X impedance)
It is calculated that the RMS maximum voltage output of the power amplifier in the 8Ω state is 80V.
②. Through the formula (dBu=20log(voltage/0.7746V))
Calculated: the maximum allowable input voltage of the power amplifier is 8.7V.
③. Through the formula (minimum effective multiple = RMS maximum output voltage / maximum allowable input voltage)
It is calculated that: when the power amplifier satisfies the nominal maximum output power, the required minimum amplification factor is 9 times, and the voltage gain is 19dB.

Summarize
The power amplifier can adjust the panel knob or press the button to reduce the magnification to any position above 9 times (voltage gain 19 dB), and the power amplifier output can reach the nominal maximum output. Therefore, there is no need to worry about adjusting the knob or button on the power amplifier panel, which will change the output power!