LBB1938/20 (EOL)

LBB1938/20 (EOL)

Bosch LBB 1938/20 Plena Power Amplifier, 480 W power amplifier in a 3U high 19”case for rack mounting or tabletop use, Line inputs : 2x, Loudspeaker outputs : 3x, Loudspeaker direct output : 100 V/ 70 V (8 ohm), Frequency response 50 Hz to 20 kHz (+1 / ‑3 dB at ‑10 dB ref. rated output), Distortion <1% at rated output power, 1 kHz.

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    Bosch

    Power Amplifier

    Bosch LBB1938/20 480W Plena Power Amplifier

    Performance

    Frequency response 50 Hz to 20 kHz (+1 / -3 dB at -10 dB ref. rated output)

    Distortion <1% at rated output power, 1 kHz

    Loudspeaker Output

    The amplifier has 70 V and 100 V outputs for constant voltage loudspeaker systems and a low impedance output for 8 ohm loudspeaker loads.

    Priority Controlled Output

    The LBB 1938/20 has two separate priority controlled 100 V outputs for zones that only need announcements made via the priority input, and for zones that will not get any announcements made via the priority input.

    Line Inputs

    Dual inputs with priority switching

    Line Loop-through

    The system has two balanced inputs with priority control, each with a loop-through facility. This makes it easy to connect remote systems that require priority control. 

    Controls and Indicators

    Overheat indicator, Air inlet for forced air cooling, Battery operation indicator

    Overheat indicator, Level control input 1 & 2, Power button, Mains switch

    Protection

    The amplifier is protected against overload and short circuits. A temperature-controlled fan ensures high reliability at high output levels and low acoustic noise at lower output levels.

    Electrical

    Mains Power Supply

    ­Voltage

    230 VAC ±10%, 50/60 Hz

    Inrush current

    19 A

    Max power consumption

    2200 VA

    Battery Power Supply

    Voltage

    24 VDC +15% / -15%

    Current max

    30 A

    Performance

    Output power (rms/maximum)

    480 / 720 W

    Power reduction on backup power

    -1 dB

    Frequency response

    50 Hz to 20 kHz (+1 / -3 dB at -10 dB ref. rated output)

    Distortion

    <1% at rated output power, 1 kHz

    S/N (flat at max volume)

    >90 dB

    Line inputs

    2 x

    Connector

    3-pin XLR, balanced

    Sensitivity

    1 V

    Impedance

    20 kohm

    CMRR

    >25 dB (50 Hz to 20 kHz)

    Gain

    40 dB

    100 V Input

    Connector

    Screw, unbalanced

    Sensitivity

    100 V

    Impedance

    330 kohm

    Line loop-through output

    2 x

    Connector

    3-pin XLR

    Nominal level

    1 V

    Impedance

    Direct connection to line input

    Loudspeaker Outputs

    3 x

    Connector

    Screw, floating

    Direct output

    100 V, 70 V, 8 ohm

    Priority only (from input 1)

    100 V or 70 V internally selectable

    Music (non-priority) only

    100 V or 70 V internally selectable

    Power Consumption

    Mains operation

    Max power

    990 W

    -3dB

    715 W

    -6dB

    510 W

    Pilot tone

    110 W

    Idle

    125 W

    24 VDC operation

    Max power

    32 A (770 W)

    -3 dB

    26 A (625 W)

    -6 dB

    18 A (430 W)

    Pilot tone*

    3.8 A (91 W )

    Idle

    0.7 A (17 W)

    Mechanical

    Dimensions (H x W x D)

    145 x 430 x 370 mm (19" wide, 3U high, with feet)

    Weight

    Approx. 25 kg

    Mounting

    Standalone, 19”rack

    Color

    Charcoal

    Environmental

    Operating temperature

    -10 ºC to +55 ºC (14 ºF to +131 ºF)

    Storage temperature

    -40 ºC to +70 ºC (-40 ºF to +158 ºF)

    Relative humidity

    <95%

    Acoustic noise level of fan

    <48 dB SPL at 1 m (max output)

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