Up for your consideration, one Sanming compression driver model SD-210R. This is new in box and includes driver gaskets. 

From Sanming:

Electronic Siren Driver

Patented High-powered Compression Driver unit for specialty applications

Power Rating: 100 Watts

Frequency Response: 180-7k Hz

V.C. Impedance: 11 Ohms (custom impedances available)

 

Sound Level

Measured at 1 Meter with 1W: 115 dB

Measured at 1 Meter with full power: 133 dB

 

Dimension (Diameter x Depth): 3.0″ x 4.6″

Weight: 3.7 lbs