Bosch LBB193X User Manual

Communication Systems | LBB 193x/x0 Plena Power Amplifier

LBB 193x/x0 Plena Power Amplifier

120 W and 240 W power amplifiers in a compact

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housing
70 V / 100 V and 8 ohm outputs

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Balanced line inputs and loop-through outputs

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100 V input for slave operation on 100 V speaker line

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Temperature controlled fan for high reliability

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Mains and battery back-up operation

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The Plena series offers several types of power
amplifier:
the LBB 1930/x0 is a 120 W power amplifier,
the LBB 1935/x0 is a 240 W power amplifier.
These are high-performance mono amplifiers capable of
fulfilling a wide variety of public address requirements
at a surprisingly low cost. The LBB 1930/x0 and
LBB 1935/x0 use the same compact 19", 2U high
housing for table-top use and rack mounting.

Functions

The amplifiers are protected against overload and short
circuits. A temperature-controlled fan ensures high
reliability at high output power and low acoustic noise
at lower power output. Additionally, all booster
amplifiers have an overheat protection circuit that
switches off the power stage if the internal temperature
reaches a critical limit due to poor ventilation or
overload.
The LBB 1930/x0 and LBB 1935/x0 has a balanced input
and a loop-through connector for easy connection of
multiple power amplifiers to increase the available
output power.
An additional 100 V line input is provided to connect the
booster amplifiers to a 100 V loudspeaker line, for
additional output power e.g. on remote locations.

Sensitivity or level control is located on the rear of the
unit to avoid accidental setting change. A VU-meter with
LED-bar shows the output level.
The amplifiers have 70 V and 100 V outputs for constant
voltage loudspeaker systems and a low impedance
output for 8 Ohm loudspeaker loads.
The power amplifiers operate both on mains power and
on a 24 V battery power supply for emergency back-up,
with automatic switchover.

Certifications and Approvals

EMC emission acc. to EN 55103-1
EMC immunity acc. to EN 55103-2

Parts Included

Quantity Component
1 LBB 193x Plena Booster Amplifier
1 19" mounting brackets
1 Power cord

www.boschsecurity.com

2 | LBB 193x/x0 Plena Power Amplifier

Technical Specifications

Electrical

Power Consumption of the Plena Amplifiers

LBB 1930 LBB 1935
230/115 V max power 273.7W 450.8W
power - 3 dB 193,2 340,3
W - 6 dB 142,6 243,8
pilot tone 20khz 41,4 55,2
idle 18,4 16,1
power red. (?) dB -2 -1
24v current max power 7.01A 12.06A

- 3 dB 6,04 11,38

- 6dB 4,29 8,09
A pilot tone 20khz 0,97 1,72
idle 0,1 0,26
24 VDC power cons max power 168.2W 289.44W

- 3 dB 144,96 273,1

- 6dB 102,96 194,16
W (out=70V) pilot tone 20khz 23,28 41,28
idle 2,4 6,24
Mains Voltage
LBB 1930/00, LBB 1935/00 230 VAC / 240 VAC, ±10%,

50 / 60 Hz
LBB 1930/50, LBB 1935/50 110 VAC, ±10%, 50 / 60 Hz
Max Mains Power Consumption
LBB 1930/x0 400 VA
LBB 1935/x0 800 VA
Max Mains Inrush Current
LBB 1930/00 8 A
LBB 1930/50 16 A
LBB 1935/00 9 A
LBB 1935/50 19 A
Battery voltage 24 VDC, +20% / -10%
Max Battery Current
LBB 1930/x0 6 A
LBB 1935/x0 11 A
Performance
Frequency Response 50 Hz – 20 kHz (+1/-3 dB,

@ -10 dB ref. rated output)
Distortion <1%@rated output power, 1 kHz
S/N (flat at max volume)
LBB 1930/x0 >80 dB
LBB 1935/x0 >85 dB
Inputs
Line input (3-pin XLR, 6.3mm phone jack, balanced)
LBB 1930/x0, LBB 1935/x0
Sensitivity 1 V
Impedance 20 kOhm

CMRR >25 dB (50 Hz - 20 kHz)
Line Input 1, 2 (3-pin XLR, balanced)
100 V Input (Screw, unbalanced)
Sensitivity 100 V
Impedance 330 kOhm
Outputs
Line Loop-through Output (3-pin XLR, 6.3mm phone jack,

balanced)
LBB 1930/x0, LBB 1935/x0
Nominal Level 1 V
Impedance Direct connection to line input
Line Loop-through Output 1,2 (3-pin XLR, balanced)
Loudspeaker Outputs (Screw, floating)
Max/rated Output Power
70 / 100 V Output LBB 1930/x0 180 W / 120 W

LBB 1935/x0 360 W / 240 W

8 ohm Output LBB 1930/x0 31 V (120 W)

LBB 1935/x0 44 V (240 W)
Output Power @ 24 V
Battery Operation -1 dB ref. rated power

Environmental

Operating Temperature -10 to +55ºC
Storage Temperature -40 to +70ºC
Relative Humidity <95%
Acoustic Noise Level of Fan
LBB 1930/x0, LBB 1935/x0 <45 dB SPL @ 1 m
Dimensions
LBB 1930/x0, LBB 1935/x0 100 x 430 x 270 mm

(19" wide, 2U high, with feet)
Weight
LBB 1930/x0 approx. 10.5 kg
LBB 1935/x0 approx. 12.5 kg

Ordering Information

Model | Description
LBB 1930/00 Plena Booster Amplifier

180 W / 125 W, 400 VA, 8 A, 31 V (125 W)

LBB 1930/50 Plena Booster Amplifier

180 W / 125 W, 400 VA, 16 A, 31 V (125 W)

LBB 1935/00 Plena Booster Amplifier

360 W / 250 W, 800 VA, 9 A, 44 V (250 W)

LBB 1935/50 Plena Booster Amplfier

360 W / 250 W, 800 VA, 19 A, 44 V (250 W)
Hardware Accessories
LBC 1901/00 Rack Mount Kit

For Plena amplifier, 19-inch