Elk M1 Question about Outdoor Siren

[Thirdwaver]

I've read several forum posts about this topic here and I'm embarrassed to say that it's still clear as mud to me.  I'm just finishing an installation of a new Elk M1 Gold system in my house.  I'm at the outside noise maker stage.  The indoor speaker that is connected to output 1 is working fine.
 
What I have on-hand is an ELK100 Siren Driver, an ELK1RT outdoor speaker with enclosure, and an ELKSL1 Strobe.  I'm not clear about whether I even needed the ELK100.  Can someone walk me through what's connected where and whether I have any incorrect/missing pieces to make this work?  I'm hesitant to just start connecting things up if I'm exceeding the amperage limits of the panel's output.

 

[RAL]

The M1 has two outputs for sirens and speakers.  You connect speakers for inside the house to Output1.  These will sound both voice announcements and siren sounds during alarm conditions.
 
External speakers or sirens can be connected to Output2.  There is a configuration option for setting this output to use either a stand alone siren, like the Elk 150RT, or a speaker, like the Elk 1RT.   With a standalone siren, the sound will not be synchronized with Output1, which can make for some unpleasant effects when you are in a place in the house where you can hear both.
 
If you use a speaker, it will produce siren sounds, but will not be used for voice announcements.  The siren sounds will be synchronized with the interior siren sounds on Output 1, since they both are driven from the M1's internal siren driver.
 
You probably don't need the Elk100.  You would use this if you had an especially large property where you wanted to have multiple exterior sirens.
 
The strobe gets connected to a 12V power source that gets triggered when the M1 goes into an alarm condition.  One way to do this would be run it off of the M1's VAUX outputs, and wire VAUX through the Output3 relay.  Then write a rule to trigger Output3 on an alarm condition. 
 
The strobe draws a fair amount of power (210mA), so check your current draw from the M1 to make sure it can handle it. Otherwise, you may need a standalone aux power supply for the strobe and any other things you want to offload from the M1.  Elk has a spreadsheet that will help you calculate your power needs.
 
Since the strobe isn't designed to operate continuously, it's a good idea to have a rule to turn off the strobe after 5 minutes or so, even if the alarm has not been reset.   Some people like to have a rule that will blink the strobe once every 30 seconds or so as an indicator that the alarm was tripped while they were away from home.