Interesting Genesis issue...

I have a Genesis multi cd horn/strobe and one day i lost my 30V DC power supply but I hadfkund a power supply that said 24V. So I wired it up and it started chirping and flashing at a very high candela. Turns out it was an AC device. Now when I add DC Power it chirps the same way, so I assumed it was broken and permantly damaged. BUT I took a risk and applied 12V DC (which is under the rated voltage) and the alarm worked perfectly, but not at 30V DC. Anyone know why this might be happening???

If it’s a 12/24VDC device, it switches between circuitry in the device depending on voltage. You likely damaged the 24v range of the device.

It is only 24v