Ceiling suppressor of voice recorders and microphones SEL-324A "Speaker"

The SEL-324A "Speaker" is a powerful and effective device for suppressing microphones in voice recorders, mobile phones and other audio recording devices by emitting complex structured interference in the ultrasonic range, inaudible to the human ear, but affecting the microphone membrane with its sound pressure directly.

Advantages and distinctive features:

Structurally, the SEL-324A "Speaker" suppressor with 24 ultrasonic emitters is made in the form of a cylindrical module only 40 mm thick, easily mounted in the housings of various flush-mounted ceiling speakers used in emergency notification systems and music broadcasting.

For even greater power of ultrasonic interference generated by the SEL-324A "Speaker" suppressor, it is possible to install a module with 48 ultrasonic emitters in the housing of a ceiling speaker.

Due to the ceiling location of the emitters and the resulting effect of multiple reflections of ultrasonic interference from interior objects, the area and efficiency of suppression of microphones and other audio recording devices brought into the room are increased.

The microprocessor control system, automatic continuous self-diagnostics of each ultrasonic channel maintain a constant highest level of ultrasonic interference power throughout the entire operating time, ensuring high reliability of the product and ease of use.

The SEL-324A "Speaker" suppressor turns on automatically when power is supplied (+12 V) or can be controlled remotely using a radio key fob.

Specifications

Range of generated ultrasonic interference 24 - 26 kHz
Number of ultrasonic signal emitters (USE) 24 (optional - 48)
Microphone suppression directionality perpendicular to the UES plane
On/off when power is supplied (optional - wireless remote control)
Maximum installation height for effective suppression 4 m
Power supply +12 V
Continuous operation time is not limited
Mounting installation dimensions (minimum) D 160 x 40 mm
Weight no more than 600 g
Housing material metal-plastic
Operating temperature range from 0 to +50 °C

The basic delivery set of the SEL-324A "Speaker" voice recorder and microphone suppressor includes:

Product SEL-324A "Speaker" with a module for 24 emitters.
Power supply +12 V, 2 A.
Operating instructions and passport for SEL-324A "Speaker".
Packing cardboard box.

Optional:
1. Product SEL-324A "Speaker" with a module for 48 emitters.
2. Wireless remote control system with a radio key fob.