Mic/line inputs
2 x (4 x for LBB 4428/00)
Connector
6-pole header for removable screw
connector (mono, balanced)
Line
Frequency response
-3 dB @ 50 Hz and 20 kHz (±1 dB)
S/N
>87 dBA
CMRR
>40 dB @ 1 kHz
Input range
-6 dBV to 6 dBV
Input impedance
22 kohm
Mic
Frequency response
-3 dB @ 100 Hz and 16 kHz
Nominal input level
-57 dBV
S/N
>62 dBA with 25 dB headroom
CMRR
40 dB at 1 kHz
Input impedance
1360 ohm
Phantom supply
12 V ±1 V @ 15 mA
Input range
-7 dBV to +8 dBV ref nominal input
value
Control inputs
8 x
Connectors
Removable screw terminals
Operation
Closing contact (with supervision)
Control outputs
1 x per amplifier channel
Connectors
Removable screw terminals
Performance
Frequency response
PRS‑xPxxx
60 Hz to 19 kHz (-3 dB)
LBB 4428/00
80 Hz to 19 kHz (-3 dB)
S/N
>85 dB (no pilot tone)
Crosstalk
<80 dB at nominal load for 1 kHz
Distortion
<0.3% (@ 1 kHz) @ 50% of rated
output power
Loudspeaker outputs
PRS‑1P500
Rated load resistance
20 ohm (100 V); 10 ohm (70 V) 5 ohm
(50 V)
Rated load capacitance
250 nF (100 V); 500 nF (70 V)
1000 nF (50 V)
Rated output power
(per channel)
500 W (1 min. at 55 °C)
250 W (30 min. at 55 °C, cont. at
30 °C)
125 W (cont. at 55 °C)
Connector
9‑pole header for removable screw
connector
Loudspeaker outputs
PRS‑2P250
Rated load resistance
40 ohm (100 V); 20 ohm (70 V)
10 ohm (50 V)
Rated load capacitance
125 nF (100 V); 250 nF (70 V) )
500 nF (50 V)
Rated output power
(per channel)
250 W (1 min. at 55 °C)
125 W (30 min. at 55 °C, cont. at
30 °C)
60 W (cont. at 55 °C)
Connector
9‑pole header for removable screw
connector
Loudspeaker outputs
PRS‑4P125
Rated load resistance
80 ohm (100 V); 40 ohm (70 V)
20 ohm (50 V)
Rated load capacitance
62 nF (100 V); 125 nF (70 V) ) 250 nF
(50 V)
Rated output power
(per channel)
125 W (1 min. at 55 °C)
60 W (30 min. at 55 °C, cont. at 30 °C)
30 W (cont. at 55 °C)
Connector
9‑pole header for removable screw
connector
Loudspeaker outputs
LBB 4428/00
Rated load resistance
166 ohm (100 V); 83 ohm (70 V)
42 ohm (50 V)
Rated load capacitance
30 nF (100 V); 60 nF (70 V) ) 120 nF
(50 V)
Rated output power
(per channel)
60 W (1 min. at 55 °C)
30 W (30 min. at 55 °C, cont. at 30 °C)
15 W (cont. at 55 °C)
Connector
9‑pole header for removable screw
connector
Mechanical
Dimensions (H x W x D)
for tabletop use, with feet
92 x 440 x 400 mm
(3.6 x 17.3 x 15.7 in)
for 19” rack use, with
brackets
88 x 483 x 400 mm
(3.5 x 19 x 15.7 in)
in front of brackets
40 mm (1.6 in)
behind brackets
360 mm (14.2 in)
3 | PRS‑xPxxx and LBB 4428/00 Power Amplifiers