The Siren Board

Zarlog wrote:

DJ2226 wrote:It might have something to do with the way the head is supported internally. The older ones had a support bracket that used to span across the chopper's mouth and connect to the "chopper tube" from the Thunderbolt. The tube itself would sit right in front of the intake. This in combination of the shorter back probably introduced some turbulence issues and inhibited airflow which is probably what bottle-necked the third generation SRN and SRNB to 128 dB. When they made the back longer they shortened the bracket and placed the chopper higher up so the tube wouldn't be in the way - might be the reason 130s and Equinoxes have a hard time holding their pitch in high winds. The longer back probably puts a little more weight onto the head causing them to have a slight lean. Other than that they are pretty much the same. I haven't noticed much of any lean on the older ones around here, but I never payed that much detail to the heads. The one above probably had it's support bracket bracket break from the shock of the impact.

Inside of the SRN. All of them from the "Roundback" to the SRNB were built this way. Credit to Jeb M.


The inside of the 130. I suspect the Equinox looks identical to this, just with an Eclipse rotor in place of the Model 3's rotor. Credit to Christopher J.

The Equinox probably has a 8 port model 3 rotor. The model 3 was available in an 8 port version so that is probably what is used. The difference between a 3 rotor and an Eclipse rotor is that an Eclipse rotor has fan blades on it and a model 3 rotor does not.

Josh(bearlovesox) wrote:I have been told that the Eclipse rotor is literally the ASC curved-vane rotor. Not sure if it's purchased from ASC or copied, but more than likely purchased.

Zarlog wrote: The Equinox probably has a 8 port model 3 rotor. The model 3 was available in an 8 port version so that is probably what is used. The difference between a 3 rotor and an Eclipse rotor is that an Eclipse rotor has fan blades on it and a model 3 rotor does not.

Thunderbolt10031 wrote:I don't understand why Federal did it like that anyway. It does more harm like that than it does leaving it the other way at 128dbc, because of leaning and being much more top heavy. If they would've just made that tube shorter in the older models, it probably would have been fine. This way the 2001 would look good, wouldn't be so top heavy, and wouldn't have such a pitch problem.

Honestly, I like the 2001, the SRN*B is my favorite in fact. I just hate the 130, because of these stupid mistakes that in reality, make the 130 look and function cheaply compared to the older ones. If its windy, then the 130 is going to struggle like heck to keep pitch and carry its sound. The older, more compact ones tend to hold their pitch very well in bad conditions.

Stormsetter4 wrote:

Thunderbolt10031 wrote:I don't understand why Federal did it like that anyway. It does more harm like that than it does leaving it the other way at 128dbc, because of leaning and being much more top heavy. If they would've just made that tube shorter in the older models, it probably would have been fine. This way the 2001 would look good, wouldn't be so top heavy, and wouldn't have such a pitch problem.

Honestly, I like the 2001, the SRN*B is my favorite in fact. I just hate the 130, because of these stupid mistakes that in reality, make the 130 look and function cheaply compared to the older ones. If its windy, then the 130 is going to struggle like heck to keep pitch and carry its sound. The older, more compact ones tend to hold their pitch very well in bad conditions.

Nothing is wrong with the 2001-130, the structural integrity of the siren is prefectly fine. Any siren would be damaged pretty badly from a car impact such as that. 2910's and Vortexes have been hit before and they have literally snapped in half and fell off the pole.