Q2B

This Q2B or "Q-siren" is mounted on a Pierce Platform Aerial Fire Truck owned by the City of Bellingham, WA.

The Q2B siren ("Q-siren") is an electromechanical siren produced by the Federal Signal Corporation. The majority of users of the Q Siren are fire departments, although some ambulances and heavy rescue squads have employed the Q-siren.^[1] The Q2B is mounted outside the truck, usually in the front bumper, on top of an extended front bumper or on the grill. Roof-mounting is no longer common due to noise in the cab. Some departments, including the New York City Fire Department, have stopped using the siren due to its loud volume, which has led to it being replaced by electronic versions such as the E-Q2B.

A fire truck using the E-Q2B siren

References

1. https://www.fedsig.com/product/q-siren Federal Signal Q2B Page (contains a sample of the siren's trademarked sound)