How loud can 22,000 cell phones be?

Questions
1

A man recently stole 22,000 cell phones. Then he crashed into a telephone pole.

But I wondered about how loud they could have gotten if they’d all been activated and put into alarm mode, and then allowed to sync in some way.

Lets asume a 28x28x28 block of cell phone stacked in the truck, at some unit distance apart. How synchronized can the sound pulses get?

2

If all the cellphones are exactly positions such that they are in phase for the listener it would add

N[10 Log10[22000]]
Out[] = 43.4242

decibels to the original sound. How well they are synchronized is very hard to guess; it depends on the frequency of the tune (if not multiple) the weather-conditions (hot/cold, pressure,…) position of the observer…