Minecraft ACA Allertor and P-15 Alert and Attack

EDIT 13/4/16 This is my resource pack. I'll have a download link soon.

EDIT 2/3/16 D/M/Y: I will be remodeling the sirens to make them better.

I sound off the P-15 and the Allertor in Alert and Attack. When the allertor fires up, you can hear another Allertor, out of sight, in Alert and Attack. However, it was very high pitched, like a Thunderbolt on chopper level 7. It finished Alert and Attack quicker than the main Allertor. Strange occurence, I did not build another Allertor in my world. There was only this one. HEROBRINE??
I sounded the P-15 to show you that it was not the P-15 that sounded off.

SPECS:

ACA P-15
Manufacturer: Minecraft Alerting Communicators of America
Model: Penetrator 15
Motor: 3500 RPM 3 phase Redstone strength 15
Port ratio: 9/12

ACA Allertor
Manufacturer: Minecraft Alerting Communicators of America
Model: Allertor 125
Port ratio: 10/12
Motor: 3400 RPM 10HP 3 phase Redstone strength 15

I will hunt for the other Allertor.