Can't figure out where my sirens are

[signal15]

I had an old ADT system and recently replaced it with an Elk.  I hooked up the 12v sirens that were previously installed, and they work.  They are LOUD and it's impossible to tell where the sound is coming from.  I can't figure out where they are mounted.
 
Are these things super tiny?  There is NOTHING mounted anywhere that looks like a siren.  I've gone over the room with a fine tooth comb, there's nothing.  But yet, the sound is there and almost disorienting because it's so loud.
 
Any ideas?  Was it common for ADT to hide these somehow?

 

[jpmargis]

There should be two.  One "exterior" probably near an attic vent; one "interior" probably near a furnace vent or the cold air return.  It should be easier to locate them if you try one at a time.

 

[signal15]

I found the interior one.  There's no exterior.  When the alarm sounds, I can't hear an outdoor one.

 

[jpmargis]

Then, I suggest you install an "exterior" siren!  In quotes because you would actually have it inside but where it can easily be heard from the street.

 

[signal15]

Then, I suggest you install an "exterior" siren!  In quotes because you would actually have it inside but where it can easily be heard from the street.

 
 
I plan on it.  But, I'll probably put it on a relay, and use an automation rule to do a delay on it before it fires.  My wireless glass breaks have proven to be pretty sensitive.  My daughter screaming set one off a couple of days ago, as well as a toilet lid being slammed.