Adastra L50U User manual

L50U
Megaphone with
USB/SD player 50W
Item ref: 952.050UK
User Manual
Version 1.1
Caution: Please read this manual carefully before operating
Damage caused by misuse is not covered by the warranty

952.050UK User Manual
Introduction
Thank you for choosing the Adastra L50U megaphone with USB/SD player. This product is designed to
offer convenient and easy operation for a wide range of portable public address requirements. Please use
the following instructions to gain the best results from your megaphone.
Safety
The L50U megaphone can produce high sound pressure levels at close quarters. Please be aware not to
aim the horn flare toward listeners at close proximity, which may risk damage to the listeners’ hearing.
The L50U operates from 10 x “D” cell batteries. It is advised to use alkaline or NiMH batteries and to
remove these when not in use for long periods of time. Some batteries can leak fluids which are corrosive
and can cause damage to the internal circuitry.
Positioning during operation
When in use, the handle of the megaphone should be held firmly with the flare facing toward the
audience. Alternatively, the megaphone can be slung under the arm using the supplied shoulder strap or
free-standing on a flat surface. An M8 threaded insert is also provided for mounting onto a plate or stand.
Cleaning
The housing is water resistant and can be cleaned with a damp cloth. Do not use detergents or solvents
on the housing and take care not to allow liquids to get inside the housing or the battery compartment.
Setting up
Before operating the L50U megaphone, it
will be necessary to load it with 10 x “D”
cell batteries. Alternatively, a 12Vdc
supply can be connected to the 12Vdc
input on the side panel.
To access the rear battery compartment,
press down the latch at the rear of the
housing marked “PUSH OPEN” and allow
the rear cover to fold down. Remove the
plastic insert from the battery
compartment and load 2 batteries into
each of the 5 cylinders as shown in the
diagram. Replace the insert and close the
cover.
Note: the pairs of batteries are loaded
with alternate polarity as imprinted on the
outside of the insert.

952.050UK User Manual
Microphone controls
Side panel
Operation
For speech and announcements, the L50U is supplied with a hard-wired microphone handset, which clips
onto the top of the housing for storage. Unclip the handset and hold the microphone (2) up to your
mouth, press in the push-to-talk button (1) and speak. The volume is adjusted by an edge roller control
(3) on the right-hand side of the handset. Sliding the push-to-talk button upwards when pushed in will
latch it on, sliding it back down will unlatch the button.
The side panel has controls for Whistle (4) and Siren (5) alerts. Pressing the Whistle button emits a loud
alarm from the L50U, releasing this button stops the alarm. Pressing in the Siren button activates a loud
siren alert, this button is latched and the siren will continue until the button is pressed again.
Also on the side panel is a button for USB (6), which activates the rear-mounted USB/SD/AUX player. This
button is also latched and the player functions are detailed below.
A 6.3mm jack MIC input (8) is provided for an optional wired microphone. To use this, press in the
latching MIC button (9). The level of the MIC input is governed by the microphone volume control (7)
Note: The Whistle and Siren alerts will not sound properly if the USB or MIC buttons are pressed in.
1.
Push to talk switch (with lock)
2.
Microphone
3.
Volume control edge roller
4.
Whistle button
5.
Siren switch
6.
USB switch
7.
Microphone volume
8.
Microphone input (6.3mm jack)
9.
Microphone on/off switch
10.
12Vdc input (DC5521 jack)

952.050UK User Manual
USB/SD player controls
As mentioned above, The USB button (6) enables the USB/SD/AUX player. This feature enables playback
of pre-recorded digital audio tracks through the megaphone.
Insert either a USB memory stick into the USB input (14) or an SD/MMC card into the SD card slot (13)
with compressed digital audio tracks stored on it. If playback does not start automatically, press the
Play/Pause button (17). The indicator LED (11) will flash to confirm that the device is in playback mode.
Tracks stored on the device may be navigated by pressing the Previous (16) and Next (18) track buttons.
Pressing and holding the Previous/Next buttons will either reduce volume (16) or increase volume (18).
The connector marked “AUX” (15) is a 3.5mm auxiliary line input for connecting a smartphone or other
audio playback device directly into the megaphone using a standard 3.5mm signal lead (not supplied).
Playback will default to the last device or audio source connected.
The button marked “M” sets the mode of the player (12) and pressing this button will alternate between
USB, SD and Aux inputs provided that a choice of sources are connected. Any inputs without an audio
source present will be ignored. Pressing the USB button (6) to the ‘out’ position will disable the USB/SD
player. After use, remove batteries if not being used for long periods of time.
Specifications
Power supply
10 x D cell alkaline batteries (not supplied) or external 12Vdc
Audio source
USB/SD audio playback or mic
Controls
On/off, volume, whistle, siren, USB/SD
Range
1.5km
Output power max.
50W
Dimensions
500 x 340mmØ
Weight
2.2kg (no battery)
Disposal: The “Crossed Wheelie Bin” symbol on the product means that the product is classed as
Electrical or Electronic equipment and should not be disposed with other household or commercial waste
at the end of its useful life. The goods must be disposed of according to your local council guidelines.
Errors and omissions excepted. Copyright© 2021. AVSL Group Ltd.
Unit 2-4 Bridgewater Park, Taylor Rd. Manchester. M41 7JQ
AVSL (EUROPE) Ltd, Unit 3D North Point House, North Point Business Park, New Mallow Road, Cork, Ireland.
11.
LED indicator
12.
Mode button
13.
SD/MMC card slot
14.
USB type A input
15.
3.5mm auxiliary input
16.
Previous track / volume down button
17.
Next track / volume up button
18.
Play / Pause track button