White noise generators are widely used to protect premises against acoustic leakage. The SP2300 Acoustic Emitter is an essential component for such systems. While transducers send the generated noise into surfaces and structures, halting the sound distribution through them, the speaker’s role is to fill voids, cavities, and ventilation shafts with acoustic interference to prevent sound leakage through the air. This creation of acoustic noise in the voids/cavities of premises increases the overall protection level, preventing such types of eavesdropping as:
- Eavesdropping using a wall stethoscope placed behind a structure adjacent to a room cavity (typically from the floor above, behind a suspended ceiling).
- Sound leakage outside the target room through voids/cavities (e.g., via ventilation shafts or common openings for heating system pipes).
Wired Microphones and Hidden Surveillance Devices in Cavities
The SP2300 loudspeaker, connected to a white noise generator, will create effective interference for all the aforementioned types of eavesdropping. The DNG-2300 is the recommended white noise generator for the SP2300, as it has a separate “SPEAKERS” output with adjustable volume and can power up to 12 speakers simultaneously.
Ventilation Shafts and other Voids Leading Outside the Protected Area
Ventilation shafts offer the possibility of eavesdropping without penetrating the target area. Sound from the target room propagates through its shafts/cavities and can be picked up remotely. In some cases, a wired microphone may be operating inside the shaft. To prevent such leakages, the SP2300 can be placed in voids or shafts and connected to a white noise generator. If the void is insufficient to accommodate the speaker in its assembled form, the speaker can be disassembled and placed inside the void without its holders.
Since the SP2300 consists of 3 parts, each being a separate speaker, 3 individual parts can be used for smaller cavities. Disassemble the SP2300 by removing the triangular holder, cut the cables, place the individual parts of the acoustic emitter where necessary, and reconnect them in series.
Space in Suspended Ceilings
Sound propagates in all directions; therefore, all conversations inside the target area can be easily picked up by eavesdropping devices in suspended ceilings. The most popular eavesdropping methods are:
- Drilling a hole from the upper floor to place a wired microphone or its tube extension behind the suspended ceiling. This is the most common method as the suspended ceiling conceals all signs of eavesdropping.
- Placing an eavesdropping device behind the suspended ceiling.
The SP2300 can be placed behind a suspended ceiling to protect against the aforementioned eavesdropping methods. If the area behind the ceiling is not separated, meaning it is one large area, the number of speakers can be chosen according to the following suggestion:
One SP2300 acoustic emitter per every 9-10 square meters.
Technical Specifications
| Power | 9 W (3 x 3 W) |
| Impedance | 24 Ohm |
| Weight | 360 g |
| Dimensions | 110×80 mm |