How to change the sensitivity of an amplifier module?

How to change the sensitivity of an amplifier module?

Summary

How to change the sensitivity of an amplifier module?

Sensitivity is the amplifier's "auditory acuity" to the input signal—it determines how "loud" (how high the voltage) the input signal needs to be for the amplifier to output its rated power.
Input Sensitivity: The minimum input voltage required to achieve rated output power.
Voltage Gain: The ratio of output voltage to input voltage (amplification factor).
Why adjust the sensitivity of the DM30?
1. Different audio devices have significantly different output voltages. If they are not matched, the amplifier will either be "underpowered" or produce "clipping" (distortion):
2. When the input signal exceeds the DSP's "maximum tolerance" (usually corresponding to 0dBFS digital full scale), clipping will occur (the top of the waveform is flattened).
3. Optimize the signal-to-noise ratio (reduce background noise). Higher gain results in more noise (thermal noise increases linearly with gain).
4. Adapt to different application scenarios (flexibility).
How to change the sensitivity of an amplifier module?
First, unscrew the screws and disconnect the connecting wires.
Secondly, locate resistors R29 and R26 on the channel board and remove them. Then install a 30K resistor.
Finally, reassemble the amplifier module.