Praesideo 3.5 Installation and User Instructions 4 Amplifiers

en 181

Frequency response:

PRS-1B500, PRS-2B250, PRS-4B125

60 Hz to 19 kHz (-3 dB) at -10 dB with maximum capacitive load and rated load resistance PRS-8B060

80 Hz to 19 kHz (-3 dB) at -10 dB with maximum capacitive load and rated load resistance

Power bandwidth:

60 Hz - 19 kHz (-3 dB, distortion < 1%) at 50% of the rated output power

Signal/Noise ratio:

>85 dBA with pilot tone off Amplifier output limiting: Soft clipping

Acoustical noise level:

<NR35 at 1 m, fans at half speed

<NR40 at 1 m, fans at full speed

aDistortion < 1%, 1 kHz, nominal mains power or battery >53V, max. 1 minute (acc. to IEC 60268-3).

b Distortion < 1%, 1 kHz, mains power or battery >50V, max. 1 minute, ambient temperature 55 °C (acc. to EN54-16).

c Distortion < 1%, 1 kHz, battery 48V, max. 1 minute, ambient temperature 55 °C.

dAlarm tone level, distortion < 0.3%, 1 kHz, mains or battery (>43.5V), max. 30 minutes, ambient

temperature 55 °C.

eDistortion < 0.3%, 1 kHz, mains or battery >43.5V, continuous, ambient temperature 30 °C.

fDistortion < 0.3%, 1 kHz, mains or battery >43.5V, continuous, ambient temperature 55 °C.

10.7.11Derating

The graph shows the continuous power used for emergency tones, speech, etc. as function of the ambient

temperature.

 

 

 

 

 

 

 

 

 

55

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

Power

Power)

45

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

Output

Output

 

 

 

 

 

 

 

35

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuous

(% of Rated

30

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

20

30

35

40

45

50

55

60

 

 

25

 

 

 

 

 

T (°C)

 

 

 

 

figure 10.19: Maximum switching power

If the amplifier is loaded with loudspeakers up to its rated output power (see section 10.7.10), you can still play music and speech for an indefinite long period of time at an ambient temperature of 55 °C, because of the crest factor (or peak-to-average ratio) of the audio signals. The crest factor of music and speech is typically 6 to 8 dB, which makes the required continuous power 25% or less of the rated output power. Alarm tones are set to -3 dB maximum by Praesideo, resulting in a required continuous power of 50% of the rated output power. This can be delivered for at least 30 minutes at 55 °C ambient or continuously at 30 °C ambient.

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Maximum switching power
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3.5 specifications

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