The protected power amplifier UMZ-20 is designed to operate as part of leak-proof sound amplification systems as a OTSS. It is installed in a rack or on a horizontal surface. UMZ-20 can be used as the main technical means of communication (OTSS) and auxiliary technical means of communication (ATSS) in dedicated rooms of all categories. It is possible to connect up to 5 participant microphone consoles with the function of automatic muting of other linear sound sources.
Advantages
UMZ-20 is a two-channel low-frequency power amplifier; UMZ-20 has symmetrical outputs for connecting acoustic systems with an impedance of 4 Ohm or 16 Ohm; The built-in mixer allows you to mix signals from the microphone (mono) and a linear source (stereo); Additional function for adjusting the muting level of linear sources when turning on the microphone; Does not create technical channels of speech information leakage:
- via the channel of electromagnetic fields;
- via the HF imposition channel;
- via the power supply and grounding channel in the speech range;
- via the power supply channel in the envelope range of the consumed current.
The linear output transmits the microphone signal for recording. System composition
Protected power amplifier UMZ-20; Protected acoustic system "Stella-2", "Stella-4" and "Stella-8"; Participant microphone consoles up to 5 pcs.; Noise generator via the power supply and grounding network
It is used if:
the transformer substation is outside the controlled area; there is a third-party consumer on the low-voltage side; the grounding loop is outside the controlled area.
When including third-party elements (signal sources and recording devices) in the complex, additional measures must be taken to protect information.
Specifications
Operating frequency range with ±3 dB unevenness, Hz
50-20000
Output power under load, W:
4 Ohm
8 Ohm
16 Ohm
2*5
2*10
2*10
Maximum sound pressure level at a distance of 1 m, not less than, dB:
- from acoustic systems "Stella-2"
- from acoustic systems "Stella-4"
- from acoustic systems "Stella-8"
86
92
95
Nonlinear distortion coefficient at a sound pressure level of 85 dB at a distance of 1 m from acoustic systems "Stella", not more than, %
0.1
Signal/noise ratio, not less than, dB
70
Depth of tone control at frequencies of 100 Hz and 10 kHz, not less than, dB
±10
Input voltage/input resistance, mV/Ohm:
- balanced input of microphone console
- balanced input of dynamic microphone
- linear unbalanced input
250/600
1/600
100/10000
Nominal input voltage, V 0.77 Continuous operation time, not less than, h 8 Overall dimensions, not more than, mm 290*80*185 Weight, not more than, kg 5