Acoustic Technology Inc. (ATI), doing business as ATI Systems is an American electronic speaker and siren manufacturer based out of Boston, Massachusetts.

History According to ATI, they began as an acoustic consulting firm. In the late 80's the company started production of sirens.

Products

Sirens

HPSS 16

The HPSS 16 is an omni-directional siren. It is the most common model produced by ATI. A system of these sirens was installed in San Francisco, however it currently inactive due to fears of cyber attacks.

HPSS 32 The HPSS 32 is an omni directional siren. It is essentially 2 HPSS 32 sirens stacked on top of each other.

MHPSS The MPSS is essentially an HPSS 16 mounted on a mobile cart

Notable systems

San Francisco, California In a period from 2004-2005, ATI replaced the system of STL-10's with ATI HPSS 16's and 32's. It was deactivated due to the threat of a cyber attack in 2019

Controversy

System failures

On March 15, 2026, an EF1 tornado touched down in the village of New Athens, Illinois. The county sirens, consisting of ATI sirens, failed to sound automatically when a tornado warning was issued. County officials didn't realize until 15 minutes before the tornado touched down: when they did realize, they manually activated them. Technicians arrived to inspect the sirens, and luckily no injuries were reported. The sirens in question were completely installed by ATI in June 2025, while the installation spanned for over 2 years from sometime in March 2023.

Security issues

Around 2017-2018, experts discovered a security vulnerability that made ATI sirens vulnerable to hacking and false alarms. It was discovered in San Francisco, California, which is the reason they have been deactivated. ATI has made the relevant patches to fix this issue.

Business practices

In August 2022, ATI released a press release announcing the release of their new product, the Multiple Stacked Circular Speaker Array, which heavily resembled a Federal Signal Modulator. This was their second "attempt" at a modulator clone, as previously they released the same product under a different name; none have ever been installed.

References

Notes