ATI HPSS

In civil defense sirens, the ATI High-Power Speaker Station (HPSS)[1] is an electronic outdoor warning siren manufactured by Acoustic Technology, Inc (ATI) that is used to alert citizens of air raids, and natural disasters.

The recent HPSS systems use high-powered electronic speakers, which can be independently arranged to provide directional or omnidirectional coverage, depending on installation.

They can also be used as public announcement (PA) systems, and can play a number of programmed tones.

Options include solar-powered operation pre-recorded voice messages.

ATI also sold rotational units of the HPSS16, and HPSS32, called the "HPSS16R" and "HPSS32R", that are now discontinued.