Bosch EVF-1181S EVF-1181S-BLK User Manual

62

63

PA1250T

PA2250T

PA2400T

PA2450L

PA4150L

Number of Channels

1

2

2

2

4

Signal-to-Noise Ratio, A-weighted

103 dB

103 dB

103 dB

104 dB

101 dB

Impedance/Voltage

70 V/100 V

4 Ω

8 Ω

70 V/100 V 4 Ω

8 Ω

70 V/100 V 4 Ω

8 Ω

4 Ω

8 Ω

Rated output power

(*rated load) THD <1%, 1 kHz

270 W

270 W

135 W

270 W

430 W

215 W

430 W

450 W

220 W

160 W

100 W

Rated output power (*rated load) THD 

<0.2%, 20 Hz – 20 kHz

250 W

250 W

125 W

250 W

400 W

200 W

400 W

400 W

200 W

150 W

75 W

Slew rate (V/µs) at 1 kHz

41/61

18

18

41/61

25

25

46/65

28

28

16

16

Frequency response -1 dB, ref. 1 kHz 

65 Hz – 20 kHz

65 Hz – 40 kHz

65 Hz – 40 kHz

<10 Hz – 40 kHz

<10 Hz – 40 kHz

THD @ rated output power 

MBW=80 kHz, 1 kHz 

<0.1%

<0.1%

<0.1%

<0.1%

<0.1%

IMD-SMPTE 60 Hz, 7 kHz

<0.1%

<0.1%

<0.1%

<0.1%

<0.1%

DIM30 3.15 kHz, 1 5kHz

<0.1%

<0.1%

<0.1%

<0.1%

<0.1%

Input impedance, 20–20,000 Hz

>20 kΩ balanced 

>20 kΩ

>20 kΩ

>20 kΩ

>20 kΩ

Input sensitivity @ rated output

power or voltage, 1 kHz 

0 dBu (775 mV)

0 dBu (775 mV)

0 dBu (775 mV)

0 dBu (775 mV)

0 dBu (775 mV)

Crosstalk ref. 1 kHz, @ 10% rated

output power 

<-75 dB

<-75 dB

<-75 dB

<-75 dB

<-75 dB

Dimensions (W x H x D)

19" x 3.5" x 16"

(483 x 88 x 406 mm)

19" x 3.5" x 16"

(483 x 88 x 406 mm)

19" x 3.5" x 16"

(483 x 88 x 406 mm)

19" x 3.5" x 16"

(483 x 88 x 406 mm)

19" x 3.5" x 16"

(483 x 88 x 406 mm)

Net Weight

36.34 lb (16.5 kg)

51.76 lb (23.5 kg)

57.27 lb (26 kg)

36.34 lb (16.5 kg)

39.65 lb (18 kg)

The PA Series of commercial power amplifiers is a 

favorite of installers everywhere for sound reinforcement, 

background music, paging and public address systems. 

Featuring low-distortion amplifier electronics that are 

bridgeable for flexible power allocation, PA Series amps 

provide a wide dynamic range with excellent headroom. 

An onboard limiter spares both amplifier and speakers 

from damaging transients, and a comprehensive 

thermal/electrical protection package ensures long-haul 

dependability. Equipped with Phoenix-style terminals for 

fast, easy hookup, PA Series amps are housed in compact, 

rack-ready 2RU chassis with ample internal airflow and 

exceptionally quiet multi-stage fans. Models are available 

in a variety of output powers and channel configurations, 

several of which provide 70 V/100 V output using low-

distortion transformers. offering outstanding versatility and 

long-term reliability, the PA Series is a remarkable value for 

any installation application.

SINGLE-CHANNEL 250 W PoWER AMPLIFIER

•  Cool-running, saturation-free power 

for distributed installations

•  Ideal for sound reinforcement, 

paging and life safety 

•  250 W mono for 70 V/100 V lines
•  Compact 2RU design
•  Stepped rear-panel level attenuation

•  Selectable 50 Hz or 300 Hz high-pass filter
•  Thermal protection, peak limiting, turn-on delay
•  Phoenix-type inputs and outputs
•  3-stage front-to-rear fans
•  Integrated rack ears for direct mounting

DUAL 270 W PER CHANNEL PoWER AMPLIFIER

•  Efficient performance for low 

impedance or distributed systems 

•  Ideal for sound reinforcement, 

paging and life safety 

•  250 W per channel for 4 Ω or 70 V/100 V lines
•  bridged mono out for 540 W into 8 Ω
•  Compact 2RU design

•  Stepped rear-panel level attenuation
•  Selectable 50 Hz or 300 Hz high-pass filter
•  Thermal protection, peak limiting, turn-on delay
•  Phoenix-type inputs and outputs
•  3-stage front-to-rear fans
•  Integrated rack ears for direct mounting

DUAL 400 W PER CHANNEL PoWER AMPLIFIER

•  Efficient performance for low 

impedance or distributed systems 

•  Ideal for sound reinforcement, 

paging and life safety 

•  400 W per channel for 4 Ω or 70 V/100 V lines
•  bridged mono out for 860 W into 8 Ω
•  Compact 2RU design

•  Stepped rear-panel level attenuation
•  Selectable 50 Hz or 300 Hz high-pass filter
•  Thermal protection, peak limiting, turn-on delay
•  Phoenix-type inputs and outputs
•  3-stage front-to-rear fans
•  Integrated rack ears for direct mounting

DUAL 450 W PER CHANNEL PoWER AMPLIFIER

•  Reliable high-quality power for installation 
•  Ideal for sound reinforcement, 

paging and life safety 

•  450 W per channel for 4 Ω or 70 V/100 V lines
•  bridged mono out for 900 W into 8 Ω
•  Compact 2RU design
•  Stepped rear-panel level attenuation

•  Selectable 50 Hz or 300 Hz high-pass filter
•  Thermal protection, peak limiting, turn-on delay
•  Phoenix-type inputs and outputs
•  3-stage front-to-rear fans
•  Integrated rack ears for direct mounting

QUAD 150 W PER CHANNEL PoWER AMPLIFIER

•  Flexible multi-channel power for installation 
•  Ideal for sound reinforcement, paging and life safety 
•  150 W per channel into 4 Ω
•  bridged mode for dual 315 W outputs into 8 Ω
•  Compact 2RU design
•  Stepped rear-panel level attenuation

•  Selectable 50 Hz or 300 Hz high-pass filter
•  Thermal protection, peak limiting, turn-on delay
•  Phoenix-type inputs and outputs
•  3-stage front-to-rear fans
•  Integrated rack ears for direct mounting