Spec Sheet

ManualsBrandsBosch Manualsaudio & home theatrePLN-1LA10

Communications Systems | PLN‑1LA10 Plena Loop Amplifier

PLN‑1LA10 Plena Loop Amplifier

www.boschsecurity.com

u High power, current driven amplifier

u Two microphone/line inputs, one priority input

(100 V)

u Selectable frequency range and tone controls

u Limiter and automatic gain control (AGC)

u Integrates in an EN 54‑16 and EN 60849 compliant

system

The PLN-1LA10 Loop Amplifier is a cost-effective

amplifier designed to drive a wire loop installed in the

floor or ceiling, covering an area of up to 600 m

per

amplifier. This solution enables hearing-aid users in

the area enclosed by the wire loop to hear all

announcements, or music. Hearing-aid users can set

their devices to the T‑mode setting to receive the

signal coming from the loop. They receive

announcements in excellent audio‑quality, without the

background noise or reverberations that normally

impair intelligibility for people with hearing

disabilities.

Functions

The loop amplifier can be connected to a mixing

amplifier’s line level output, or it can accept up to two

microphone/line signals directly. A 100 V priority input

is available for uplink to a Plena Voice Alarm System.

This input can be monitored for the presence of a

pilot‑tone. The built‑in supervision monitors all key

functions of the loop amplifier, and the fault state is

available on a fail-safe relay. This makes it possible to

use the loop amplifier in an IEC 60849 compliant

system, and to include the induction loop in the

supervised transmission paths.

For added ease, the loop amplifier is equipped with a

limiter that keeps the output field strength below the

prescribed 100 mA/m. This circuitry can also be set to

an automatic gain control (AGC) that amplifies weak

signals for enhanced intelligibility, while attenuating

loud signals. This ensures that all information is

presented at a comfortable listening level.

The unit has tone controls and a metal loss

compensation circuit to adjust the sound to the

program material and the environment. The controls

have locks to prevent unwanted access after they have

been adjusted.

The loop amplifier is stackable (master/slave

configuration) to cover very large areas, and supports

low spillover schemes. Its unique quadrate

configuration provides uniform field strengths even

over multiple loops.

Controls and indicators

Front

• LED power meter

• Current meter

• Four LEDS for fault, limiter, AGC, loop integrity

• Headphones socket

• Two tone controls

Summary of content (3 pages)

PAGE 1
Communications Systems | PLN‑1LA10 Plena Loop Amplifier PLN‑1LA10 Plena Loop Amplifier www.boschsecurity.com The PLN-1LA10 Loop Amplifier is a cost-effective amplifier designed to drive a wire loop installed in the floor or ceiling, covering an area of up to 600 m2 per amplifier. This solution enables hearing-aid users in the area enclosed by the wire loop to hear all announcements, or music. Hearing-aid users can set their devices to the T‑mode setting to receive the signal coming from the loop.
PAGE 2
| PLN‑1LA10 Plena Loop Amplifier • Three input volume controls (master and two channels) • On/off switch Back • • • • • • • • • • Metal loss compensation control Supervision switch Voltage selector Frequency range switch AGC/Limiter switch AGC range control VOX/mix switch Pre/post amp switch Two phantom power switches Two Mic/line switches Interconnections Back • • • • • • • • • Master input Two slave outputs Audio inputs Priority input Induction loop output Line output Fault output Ground screw Main
PAGE 3
| PLN‑1LA10 Plena Loop Amplifier Connector 3‑pin XLR, balanced Nominal level 1V Impedance 200 ohm Loop output Connector Screw Slave output (for master input of other PLN-1LA10) Connector 1/4”TS jack 0° to 90° Fault Relay Connector Screw Contacts 100 V, 2 A (voltage free, SPDT) * Only intended for slave output of another PLN-1LA10. Plugging a jack into this input disables all other inputs and the limiter. The unit becomes a slave to the connected master.