If you just play the alarm and broadcast the call, it is recommended to use the constant-voltage sound column. The power can be considered to be a little higher, 40-60W is enough, and 4-6 are enough. It is no problem to play music and broadcast announcements, and this power outdoor playground can be used. Moreover, the warehouse is relatively a closed space, which is even more problematic. At the same time, due to the heavy echo in the warehouse, if there are too many speakers, it will cause mutual interference, and due to the delay effect of speakers at different distances, it will produce serious echo of stadium sound reinforcement. It's hard to hear. Therefore, the number of speakers should not be too large. The power of the power amplifier should be greater than the sum of all speaker powers, generally greater than 1.2 times. You can choose a combined constant voltage power amplifier with its own microphone processing circuit, and you can directly plug the microphone into the power amplifier to shout.