I'm pretty sure the definition of "supercharging" a siren is Forced Induction- feeding a siren's intake with more air than the rotor pulls in naturally with a blower of some sort. On the other hand, there are few members here that own these little sirens; most of us have real sirens, like...

This is a how-to on How to supercharge your boring MS-290 siren. I have an MS-290 siren that supposed to run on 9 volts, and It's was boring and not that loud like a real siren, So I supercharged the siren. To supercharge it, I ran it on a 12 volt NI-CD drill battery and It was very loud and it even...