In Condemned: Criminal Origins, there are no Sonic Emitters visible, but many dead birds can be found around the city in various levels of decay. It is revealed early on in Condemned 2 that despite being attracted to sonic wavelengths, their small brains cannot handle them, causing their heads to explode. In Condemned 2: Bloodshot, the number of Sonic Emitters destroyed during the course of a level directly affects the rank given at the end of the level.
Condemned 2: Bloodshot MultiplayerEdit
Sonic emitters are available in Crime Scene Mode in Condemned 2's multiplayer component. Players on The Influenced side can select a sonic emitter as a starting weapon. Placing a sonic emitter near evidence scrambles the SCU's spectrometers, making it more difficult for them to find the evidence.