This siren was nearly identical to its older brother, but is instead powered by a 15 HP motor. Some models have been equipped with dampers in the tube to create a coded pulse signal. Like its slightly less powerful brother, the P-15 came in both 8-port single tone and 9/12 port dual tone, with a rating of 125db at 100ft. The P-15 was most commonly found with the 8-port rotor, as the motor was much more capable of handling it and performed better. In 1992, the P-15 was re-released as the ASC RM-1