Products - Public Address System, Amplifier - LBB 1938

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R120W, 240W AND 480W BOOSTER AMPLIFIERS IN A COMPACT HOUSING

70V/100V AND 8OHM OUTPUTS

BALANCED LINE INPUTS AND LOOP-THROUGH OUTPUTS

100V INPUT FOR SLAVE OPERATION ON 100V SPEAKER LINE

TEMPERATURE CONTROLLED FAN FOR HIGH RELIABILITY

MAINS AND BATTERY BACK-UP OPERATION

PLENA booster amplifier LBB1930/x0, LBB1935/x0 and LBB1938/00 The PLENA series offers three types of booster amplifiers: the LBB1930/x0 is a 120W booster amplifier, the LBB1935/x0 is a 240W booster amplifier and the LBB1938/00 is a very powerful 480W booster amplifier. These are high performance mono amplifiers capable of fulfilling a wide variety of public address requirements at a surprisingly low cost. The LBB1930/x0 and LBB1935/x0 use the same compact 19", 2U high housing for tabletop use and rack mounting, while the LBB1938/00 comes in a 19”, 3U high housing.

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. On the LBB1938/00 this is shown by the front panel overheat indicator.

The LBB1930/x0 and LBB1935/x0 have a balanced input and a loop-through connector for easy connection of multiple booster amplifiers to increase the available output power. The LBB1938/00 has two balanced inputs with priority control, each with a loop through facility. This allows for easy and automatic switching between e.g. a local music source and a priority announcement from a remote system. An additional 100V line input is provided to connect the booster amplifiers to a 100V 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 70V and 100V outputs for constant voltage loudspeaker systems and a low impedance output for 8 Ohm loudspeaker loads. Additionally, the LBB1938/00 has two separate priority controlled 100V 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.

The booster amplifiers operate both on mains power and on a 24V battery power supply for emergency backup, with automatic switchover. The LBB1938/00  has a front panel LED, that shows when it operates on the battery

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