Basic electrical, it takes the path of least resistance, so if the load itself via the driver's circuit board is higher than the 2.2K, it won't ever work since it won't get any voltage.
Try it and post your results.
Electricity will ALWAYS take the path of least resistance, however, It takes all paths available—in inverse proportion to the impedance of the paths. Current flows through all available paths. The magnitude of the current flowing in each path depends on the voltage and impedance of each path.
Siren driver circuits have resistance (we're not talking about the onboad driver of the M1 in this case), as there is a circuit board involved, not a straight low ohm load like a speaker.
Electricity will not flow significantly through a higher resistance path when it has an existing path with a lower resistance already.
I stated IF the driver that is internal to the siren, which is installed separately, since the panel is pushing voltage and not a driver output, it may not fire since a 2.2K load (or high resistance short) already exists on OUT 2 since it is being strapped out.
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