Louroe Electronics MLA-6 Bedienungsanleitung

The MLA-6 and MLA-8 are microphone mixers with six and eight audio inputs and one audio output

respectively. They are designed to combine up to six and eight microphones (or up to four

speaker/microphones) to expand the listening area of an audio zone. The MLA-8 is located between the

microphones (or speaker/microphones) and the Louroe base station. In addition, it has a line driver amplifier

that allows for runs up to 5,000 ft. between the MLA-8 and the Louroe base station and up to 1,000 ft. between

the MLA-8 and the remote microphone (or speaker/microphone) for a total of 6,000 ft.

MLA-6/MLA-8

MICROPHONE MIXER

INSTALLATION AND OPERATING INSTRUCTIONS

WIRING REQUIREMENTS:

Microphone Only:

Louroe Verifact A, B, C, D, D-V, E, K or L-DT

Microphone/Speaker

Louroe Model TLI, TLM, TLMC, TLO, TLSP

2 Conductor shielded cable, 22

gauge with a 24 gauge drain wire

NOTE: Unshielded cable is not

satisfactory for audio systems

WIRING REQUIREMENTS

West Penn 452 or equivalent

WIRING REQUIREMENTS

4 Conductor consisting of:

2 Conductor shielded, 20 gauge

with 22 gauge drain (microphone

connection)

2 Conductor unshielded, 18 gauge

(speaker connection)

All in the same jacket

West Penn 356 or equivalent

6955 VALJEAN AVE, VAN NUYS, CA 91406

PH: (818)994-6498 / FAX: (818)994-6458

/ www.louroe.com[email protected]

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MODEL MLA-6

AD-1 POWER SUPPLY

MODEL MLA-8

RCA CABLE

THIS INSTALLATION INSTRUCTION APPLIES

TO BOTH MLA-6 AND MLA-8 (SHOWN). THE MLA-8

IS USED IN THIS INSTALLATION INSTRUCTION

INPUT CONNECTIONS TO MLA-8

MICROPHONE CONNECTION:

At the top part of the PC board are 8 Terminal blocks marked 1 through 8 (for 8 zones). Each terminal

block has 5 Pins marked - A, B, C, SP and G . Bring in wire from remote microphone (or

speaker/microphone) and connect as follows:

Pin A (12 Vdc) from remote microphone to Pin A of MIC 1 terminal block of MLA-8(red wire)

Pin B (audio) from remote microphone to Pin B of MIC 1 terminal block of MLA-8(black wire)

Pin C (ground) from remote microphone to Pin C of MIC 1 terminal block of MLA-8.(bare wire)

Repeat connections for ZONE 2 to ZONE 8.

Use 2 Cond Shielded cable (see page1) if only microphones are to be connected.

SPEAKER CONNECTION (used only if microphone/speaker units are being connected):

Green wire from speaker to Pin SP of MIC1 terminal block of MLA-8

White wire from speaker to Pin G of MIC 1 terminal block of MLA-8

Repeat this connections for the rest of the zones.

Use 4 Cond shielded cable such as West Penn 356 (see page1) if microphone/speaker units are used.

POWER REQUIREMENTS

For Cable runs 1,000’ and under

If the total distance from the remote microphone (or speaker/microphone) to the MLA-8 Mixer and on to the

Louroe Base Station is under 1,000 ft., the MLA-8 will receive 12Vdc power from the base station. No

power is required at the MLA-8.

For Cable runs 1,000 to 5,000’

If cable run between MLA-8 and Louroe Base Station is over 1,000 ft and up to 5,000 ft, 12 Vdc power is

required. An input jack for power is located on MLA-8 chassis. For this length of run, MLA-8 should be

mounted within 1,000’ of the microphone.

IMPORTANT NOTE

1. If Model MLA-8 Mixer is to be powered for a cable run between 1,000 ft. and 5,000 ft. from the Louroe base

station, do not use terminal “A” connection between the MLA-8 and the Louroe base station.

2For cable runs that exceed 1000 ft or up to 5,000 ft, MLA-8 Mixer should not be positioned more then 1,000

ft. from the Louroe microphone or speaker/microphone.

NOTE: If alternate power supply is

used, DO NOT USE POWER

SUPPLY IN BASE STATION

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INSTALLATION AND OPERATING INSTRUCTIONS

mla_6/8_inst_3/15

OUTPUT CONNECTION FROM MLA-8 MIXER TO LOUROE BASE STATION

(Note: Power supply of the MLA-8 must not be used when connecting to a Louroe base station if the

distance is less than 1000’.)

MICROPHONE CONNECTION:

Located at the bottom of the PC Board is a single 3-pin terminal block marked “AUDIO OUT” and

contains three pins marked A, B, C using the shielded portion of recommended cable connect as

follows:

Red wire goes to Pin “A” (12Vdc)

Black wire goes to Pin “B” (Audio Output)

Bare wire goes to Pin “C” (ground)

SPEAKER CONNECTION:

Applies only if speaker/microphones are being connected. If remote units are microphones only, skip

this step and use the recommended cable shown in page 1.

The speaker input connection utilizes the 2-pin terminal block marked “SPEAKER”.

Pin marked “SP” of MLA-8 (green wire) connects to Pin “SP” also of terminal block at the base

station

Pin marked “G” of MLA-8 (white wire) connects to Pin “G” of terminal block at the base station

For connections to the speaker inputs of the Louroe base station, please refer to the specific

installation instructions for that model.

OUTPUT CONNECTION FROM MLA-8 MIXER TO OTHER RECEIVING DEVICES SUCH AS

DVRS, ETC.

(Note: Power supply of the MLA-8 must be used when connecting to receivers other than Louroe base station

Using the recommended cable (2 Cond. Shielded 22 AWG) see page 2 for connecting the microphone

to the input terminal blocks (Zone 1 to 8) MLA-8, matching Pin A to A, B to B and C to C.

The MLA-8 has 2 types of audio outputs.

When using the 3-pin terminal block, connect 2 wires to Pin B and Pin C. Pin B is positive audio which

can be connected to the positive of the audio input of the receiving device. Pin C is ground and can be

connected to the ground of the audio input of the receiver.

The other output is an RCA jack which can be connected to an RCA type input of the receiving device.

Plug in power supply (included) to +12Vdc power jack.

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INSTALLATION AND OPERATING INSTRUCTIONS

mla_6/8_inst_3/15

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INSTALLATION AND OPERATING INSTRUCTIONS

MICROPHONE ADJUSTMENT CONTROLS

On MLA-8 PC board are eight potentiometers (marked 1 thru 8) and one MASTER CONTROL marked “MAIN”.

They are for controlling the microphone gain and have been pre-set at the factory. DO NOT MAKE ANY

ADJUSTMENTS ON THE MLA-8 UNTIL ALL MICROPHONE AND SPEAKER CONNECTIONS HAVE BEEN

MADE TO THE LOUROE BASE STATION OR OTHER RECEIVING DEVICE.

A. If connected to a sound activated ALARMING BASE STATION (Models DG-25III and DG-12II):

1. First set zone threshold following procedures outlined from base station installation instructions.

2. If the zone is too sensitive and goes into alarm unnecessarily, adjust MASTER CONTROL

potentiometer on MLA-8 board (marked “MAIN”) 1/8 of a turn counterclockwise. If still too

sensitive, decrease by 1/8 turn counterclockwise until desired sensitivity is attained. In the

event zone is not sensitive enough, adjust master control potentiometer 1/8 turn clockwise.

Repeat if necessary.

3. If it is determined that a particular microphone within the zone is too sensitive, adjust the correct

potentiometer (marked 1 thru 8) counterclockwise 1/8 turn. Repeat 1/8 turn as necessary.

B. If MLA-8 is connected to a NON-ALARMING LOUROE BASE STATION (APR-1, AP-2,

AP-4, AP-8, AP-12TB or AP-16TB). Potentiometer adjustment is usually unnecessary.

EXCEPTION: If microphones are overdriving DVR/VCR or other external equipment, adjust master control

potentiometer 1/8 turn counterclockwise to reduce microphone sensitivity. Repeat if necessary.

mla_6/8_inst_3/15

SPECIFICATIONS

Output Level

Voltage Supply

Frequency Response

Weight

Dimensions

100 Hz to 10 kHz

10 oz

3 lbs

11 1/2”L x 4 3/4”W x 1 1/2”H

Input Impedance

Current Drain

18kW

+10dB max gain adjustable

Line level (0dBV, 1kW@ 1kHz)

25 mA

12 Vdc, 500 mA

INSTALLATION AND OPERATING INSTRUCTIONS

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NOTES

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INSTALLATION AND OPERATING INSTRUCTIONS

mla_6/8_inst_3/15

IMPORTANT NOTICE

When this equipment is used as part of an

audio monitoring system, the law requires

that the public be given notice of AUDIO

MONITORING ON THE PREMISES. A

decal notice is included with each

microphone shipped.

Federal Law References:

Federal Regulations, US Code, Title 18.

Crime and Criminal Procedure, Sec 2510.

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INSTALLATION AND OPERATING INSTRUCTIONS

AUDIO

MONITORING

These Premises

WARRANTY

LOUROE ELECTRONICS warrants that at the time of shipment products manufactured by LOUROE ELECTRONICS to be free of defects in material and workmanship.

Should a defect appear within one year (12 months) from date of shipment, LOUROE ELECTRONICS will, at its sole discretion, repair or replace the defective equipment.

This equipment shall not be accepted for repair or return without prior notification by LOUROE ELECTRONICS .

This warranty does not extend to any Louroe product that has been subjected to improper or incorrect installation, misuse, accident, or in violation of installation

instructions provided by LOUROE ELECTRONICS.