The Siren Board

actually, isn't this a P-10? it looks and sounds exactly like the P-10s we have here for Three Mile Island. This has a cone-shaped intake, while the P-15s have a straight cylindrical shaped intake.

I've wanted to see a P-10 in action for a while. they only run them annually for testing. all I have is my famous recording with the obscenities in it.

Yes it is a P-10, since it's dual toned and has a cone shaped intake. It also sounds rather pumped up.

One question, tho:

As it is with this kind of dualtone siren, so with all others (SD-10, Federal 5T, dual Allertor & Banshee, etc) like the Penetrator here presented.

I particularly hear the deep buzzing sound that matches the high note and is common to all models above-mentioned...is this the siren's motor? Somehow, I don't think it would come from a third rotor and vane component.

PhRed wrote:One question, tho:

As it is with this kind of dualtone siren, so with all others (SD-10, Federal 5T, dual Allertor & Banshee, etc) like the Penetrator here presented.

I particularly hear the deep buzzing sound that matches the high note and is common to all models above-mentioned...is this the siren's motor? Somehow, I don't think it would come from a third rotor and vane component.

I think that what you are hearing is the resultant tone of the perfect 4th interval that these sirens produce. Any siren that has a 9/12 port ratio, such as the Model 5T, P-10, most Allertors, some 500ATs, and the Banshee, will generate perfect 4th interval. This interval (the space between two musical frequencies; in this case, C and F on a piano) has a particularly harsh and prominent resultant that is two octaves below the higher note (F). The first time I heard a 3T22, which sounds a minor 3rd interval, it sounded like a three-tone siren playing a Bb major chord, with the resultant Bb in addition to the D and F notes.

That thing sounds awesome

I played this video for a guy who repairs sirens he says It's a P-15

Archon wrote:I played this video for a guy who repairs sirens he says It's a P-15

Really? So the intake cone's shape doesn't mean P-10 or P-15, but rather single or dual tone?

I think the number in the Pen model refers to the horsepower in the motor, like Federal 2, 3, 5, 7 etc...

RamFett wrote:

Archon wrote:I played this video for a guy who repairs sirens he says It's a P-15

Really? So the intake cone's shape doesn't mean P-10 or P-15, but rather single or dual tone?

The shape of the intake usually has nothing to do with dual or single tone. The later P-15s made before ACA changed over to ASC thus changing them to RM-127s, had the straight intake cone, and if I'm not mistaken were only single toned. I saw a dual toned P-15 in TMI's system a few years ago. It had the cone shaped intake like the other P-10s in their system.