LG RK4 Owner's Manual

OWNER’S MANUAL

MFL70041967

HIGH POWER
SPEAKER
SYSTEM

Please read this manual carefully before operating your set and
retain it for future reference.

MODEL

RK4

www.lg.com

Copyright © 2019 LG Electronics Inc. All Rights Reserved.

1905_Rev01

Getting Started2

Safety Information

1

Getting Started

CAUTION: TO REDUCE THE RISK OF ELECTRIC

SHOCK DO NOT REMOVE COVER (OR BACK)

NO USER-SERVICEABLE PARTS INSIDE REFER

SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK
HAZARD, DO NOT EXPOSE THIS PRODUCT TO RAIN
OR MOISTURE.

CAUTION: The apparatus should not be exposed to
water (dripping or splashing) and no objects lled
with liquids, such as vases, should be placed on the
apparatus.

WARNING: Do not install this equipment in a
conned space such as a book case or similar unit.

CAUTION: Do not use high voltage products around
this product. (ex. Electrical swatter) This product may
malfunction due to electrical shock.

CAUTION: No naked ame sources, such as lighted
candles, should be placed on the apparatus.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This lightning ash with arrowhead
symbol within an equilateral
triangle is intended to alert the
user to the presence of uninsulated
dangerous voltage within the
product’s enclosure that may be of
sufcient magnitude to constitute
a risk of electric shock to persons.

The exclamation point within an
equilateral triangle is intended
to alert the user to the presence
of important operating and
maintenance (servicing)
instructions in the literature
accompanying the product.

CAUTION: Do not block any ventilation openings.
Install in accordance with the manufacturer’s
instructions.
Slots and openings in the cabinet are provided
for ventilation and to ensure reliable operation of
the product and to protect it from over heating.
The openings shall be never be blocked by placing
the product on a bed, sofa, rug or other similar
surface. This product should not be placed in a built­in installation such as a bookcase or rack unless
proper ventilation is provided or the manufacturer’s
instruction has been adhered to.

NOTICE: For safety marking information including
product identication and supply ratings, please refer
to the main label on the bottom or the other surface
of the product.

Getting Started 3

CAUTION concerning the Power Cord

The Power Plug is the disconnecting device. In case
of an emergency, the Power Plug must remain readily
accessible.

Check the specication page of this owner’s manual
to be certain of the current requirements.

Do not overload wall outlets. Overloaded wall outlets,
loose or damaged wall outlets, extension cords, frayed
power cords, or damaged or cracked wire insulation
are dangerous. Any of these conditions could result
in electric shock or re. Periodically examine the
cord of your device, and if its appearance indicates
damage or deterioration, unplug it, discontinue use of
the device, and have the cord replaced with an exact
replacement part by an authorized service center.
Protect the power cord from physical or mechanical
abuse, such as being twisted, kinked, pinched, closed
in a door, or walked upon. Pay particular attention to
plugs, wall outlets, and the point where the cord exits
the device.

Symbols

~

0

1

!

Refers to alternating current (AC).

Refers to direct current (DC).

Refers to class II equipment.

Refers to stand-by.

Refers to “ON” (power).

Refers to dangerous voltage.

1

Getting Started

Table of Contents4

Table of Contents

1 Getting Started

2 Safety Information
6 Unique Features
7 Playable file Requirement
7 – Music file requirement
7 – Compatible USB Devices / SD cards
7 – USB device / SD card requirement
8 Rear panel
10 Carrying the unit

2 Connecting

11 Connecting the AC Adapter
12 Use of Tripod
14 Optional Equipment Connection
14 – LINE IN Connection
14 – LINE OUT Connection
15 – USB Connection
15 – SD card Connection

3 Operating

16 Basic Operations
16 – USB/SD Operations
16 Using BLUETOOTH® wireless technology
16 – Listening to music stored on the Bluetooth

devices
18 Other Operations
18 – Using Microphone
18 – Adjusting the ECHO volume

18 – Setting the USER EQ
18 – LIGHTING

4 Troubleshooting

19 Troubleshooting

19 – General

5 Appendix

20 General specifications
21 Maintenance

21 – Handling the Unit

21 Trademarks and Licenses

Table of Contents 5

1

2

3

4

5

Getting Started6

Unique Features

Bluetooth®

1

Listens to music stored on your Bluetooth device.

Getting Started

Carrying the unit

This unit have wheels and handle for carrying. You
can easily carry the unit.

Getting Started 7

Playable file Requirement

Music file requirement

MP3 le compatibility with this unit is limited as
follows.

y Sampling frequency :

y Bit rate : within 32 to 320 kbps

y Maximum les : 999

y Maximum folders : 999

y File extension : “.mp3”

y Certain MP3 les may not be played depending on

the type or format of the le.

within 32 to 48 kHz

Compatible USB Devices / SD cards

yMP3 Player : Flash type MP3 player.

y USB Flash Drive :

Devices that support USB2.0 or USB1.1.

y SD card : SD, SDHC

y The USB / SD function of this unit does not

support all USB devices and SD cards.

USB device / SD card requirement

y Devices which require additional program

installation when you have connected it to a
computer, are not supported.

y Do not extract the USB device / SD card while in

operation.

y For a large capacity USB or SD card, it may take

longer than a few minute to be searched.

y To prevent data loss, back up all data.

y If you use a USB extension cable or USB hub, the

USB device is not recognized.

y Using NTFS le system is not supported.

(FAT(16 / 32) and ExFAT le systems are
supported.)

y External HDD, SDD, Card readers, Locked devices,

or hard type USB devices are not supported.

y USB port of the unit cannot be connected to PC.

The unit cannot be used as a storage device.

y Some USB / SD cards may not work with this unit.

1

Getting Started

Rear panel

1

Getting Started

Getting Started8

a

b

i

j
k

c

d

e

f

g

h

l

m

n

Display window

a

INPUT

b

Selects the input source.

(Skip)

C

Skips backward.

(Play/Pause)

N

Starts or pauses playback.

(Skip)

V

Skips forward.

REPEAT

Listens to your files repeatedly.

MUSIC VOL (Volume)

c

Adjusts speaker volume.

BASS VOL (Volume)

d

Adjusts BASS sound level when setting USER EQ.

TREBLE VOL (Volume)

e

Adjusts TREBLE sound level when setting USER

EQ.

ECHO VOL (Volume)

f

Adjusts echo volume.

MIC (Microphone) VOL (Volume)

g

(Microphone) 1/2 Jack

h

USB Port

i

You can play sound by connecting the USB device.

SD card slot

j

You can play sound files by connecting the
SD card.

LIGHTING

k

Lighting effect on or off.

LINE IN / OUT (L/R)

l

DC 25 V 0 2 A (AC adapter input)

m

POWER ON / OFF

n

Switches the unit ON or OFF.

Getting Started 9

1

Getting Started

Getting Started10

Carrying the unit

This unit have wheels and handle for carrying. You

1

can easily carry the unit.

Getting Started

Pull the handle.

Caution

>

yDo not shake the handle to hard. Otherwise it

may result in the unit will be damaged.

yDo not hang heavy things on the handle.

Otherwise it may result in the unit will be

damaged.

yDo not draw the unit on the unpaved road or

the stair.

yBe careful it does not drop the unit when you

carry it.

yCarry the unit, after then disconnect the

connected cables.

yDo not step or sit on the unit. Otherwise

this unit may fall down and causing personal
injury.

yDo not place the unit on an unstable position

and place the unit at a safe distance from the
child’s reach.

yBe careful that the unit should not fall down.

Otherwise it may result in malfunction and
causing personal injury and/ or property

damage.

yFix the handle when you use the unit.

Connecting the AC Adapter

Connect the speaker to the power supply with the
supplied AC adapter.

1. Connect the supplied AC power cord to the AC
adapter.

2. Connect the AC adapter cable to DC. IN adapter
input.

3. Plug the AC power cord into an AC outlet.

AC Adapter

AC power cord

Connecting 11

2

Connecting

Caution

>

Only use the AC adapter supplied with this
device. Do not use a power supply from another
device or manufacturer. Using any other power
cable or power supply may cause damage to the
device and void your warranty.

Connecting12

Use of Tripod

You can mount the unit on a tripod.
The tripod is an optional purchase.

Caution

>

yExtend the tripod legs as much as possible

and tighten up the screw securely.

2

Connecting

yBefore connecting with the unit, you must set

up the tripod completely to prevent shaking.

1. Unfold the tripod on a flat surface. And then fix
the tripod. Tighten up the tightening part of the
tripod.

2. Lift the speaker and connect the tripod to fixing
part on the bottom of the speaker.

3. Tighten up the Hand screw on the bottom of the
unit.

Caution

>

Insert the safety pin when setting up the tripod

stand.

Connecting 13

Note

,

yIf you use a tripod, use the tripod only for

speaker.

yBefore buying a tripod, check the

specications for maximum bearing load of
the center column.
(Unit’s net weight : about 15.0 kg)

35 mm

(B)

(A)

yUse tripod as below :

(A) From tripod’s center to tripod’s leg :
above 540 mm
(B) From top of tripod to bottom of tripod :
below 750 mm
(C) Tripod net weight : over 2.5 kg

yUse a tripod as low as possible for safety

use.

yYou should pull the center column to the

maximum only in case of need.

yMount only one unit on each tripod.

yDo not try to extent the tripod legs outside

over its allowed range.

yMake sure the tripod is correctly assembled

and all its components are tightly
connected.

yDo not try to assemble the tripod if parts

are missing or defective.

yAfter installation, check whether the unit is

xed rmly on the tripod or not.

yDo not place the unit on an unstable

position where it might accidentally fall over.

yAdd weight such as sand bags around the

tripod legs to prevent them from falling
over.

Note

,

yYou should limit people around the unit

while using this unit with tripod. Otherwise
it may result in malfunction and causing
personal injury or property damage.

yStanding on the stool to reach unit control

panel is risky and might lead to injuries.

yDo not put or attach other objects on the

tripod.

yDo not shake or push the unit when the

tripod is installed.

yRefrain from moving around the tripod after

unit is installed.

yRemove the units from all connected cables

of the tripods before moving the tripods or
adjusting their height.

yWhen transporting or moving the unit,

always use two or more people.

yWhen you use the tripod, use an extension

cord. always be careful the movement of
cable.

yIt is prohibited to use this unit outside.

(Indoor use only)

yDo not expose the unit to excessive dust or

vibrations, or extreme cold or heat (such as
in direct sunlight, near a heater) to prevent
the possibility of panel disguration or
damage to the internal components.

yWhen using the external input cable (Mic,

etc.) after installing the unit on the tripod,
external input cable can cause the unit to
fall down.

yWatch out the people can trip over the

input cable (Mic, etc.) connected the unit.

yAlways be careful of the unit being tripped.

2

Connecting

Connecting14

Optional Equipment Connection

LINE IN Connection

Connect an output of auxiliary device (Camcorder, TV,
Player, etc) to the LINE IN (L/R) connector.

If your device has only one output for audio (mono),

2

Connecting

connect it to the left audio jack on the unit.

Audio cable

WhiteRed

R

LINE OUT Connection

Connect an input of auxiliary device to the LINE OUT
(L/R) connector.

If your device has only one input for audio(mono),
connect it to the left audio jack on the unit.

R

Audio cable

DVD, Blu-ray player etc.

Listening to music from your external
device

The unit can be used to play the music from many
types of external device.

1. Connect the external device to the LINE IN
connector of the unit.

2. Connect the power.

3. Press INPUT to select LINE.

4. Turn on the external device and start it playing.

Connecting 15

USB Connection

Connect a USB device (or MP3 player, etc.) to the
USB ports on the unit.

USB device

Note

,

Removing the USB device from the unit :

1. Choose a different function.

2. Remove the USB device from the unit.

SD card Connection

Connect a SD card to the SD slot on the unit.

SD card

Note

,

Removing the SD card from the unit:

1. Choose a different function.

2. Remove the SD card from the unit.

2

Connecting

Operating16

Basic Operations

USB/SD Operations

Connect the USB device to the USB port. Or connect
the SD card to the SD slot. When you connect the
USB device or SD card, the player plays an audio
le contained in the USB / SD storage device
automatically.

To Do this

Playback Press N.

Pause Press N during playback.

3

Operating

Skipping to

the next/

previous le

Playing

repeatedly

yDo not extract the USB device or SD card

during operation. (play, etc.)

yRegular back up is recommended to prevent

data loss.

yIf the USB device and SD card is connected

to the unit at the same time, use the unit by
changing a function.

yThe resume point may be cleared when in the

cases below

- Turning off the unit.

- Removing the USB device or SD card from

- Pulling out the power cord.

- Changing to a function.

Press V to go to the next le.

Playing less than 4 seconds,
Press C to go to the previous le.
Playing after 4 seconds, press C

to go to the beginning of the le.

Press REPEAT repeatedly.

ONE <-> ALL

Note

,

the unit.

Using BLUETOOTH® wireless technology

About Bluetooth

Bluetooth is wireless communication technology for

short range connection.

The sound may be interrupted when the connection
interfered by the other electronic wave or you
connect the Bluetooth in the other rooms.

Connecting individual devices under Bluetooth
wireless technology does not incur any charges. A
mobile phone with Bluetooth wireless technology
can be operated via the Cascade if the connection
was made via Bluetooth wireless technology.

yAvailable Devices : Smart phone, MP3, Notebook,

etc.

yVersion : 3.0

yCodec : SBC

Bluetooth Profiles

In order to use Bluetooth wireless technology,
devices must be able to interpret certain proles. This
unit is compatible with following prole.

A2DP (Advanced Audio Distribution Prole)

Listening to music stored on the Bluetooth devices

Pairing your unit and Bluetooth device

Before you start the pairing procedure, make
sure the Bluetooth feature is activated on your
Bluetooth device. Refer to your Bluetooth device’s
user guide. Once a pairing operation is performed, it
does not need to be performed again.

1. Select the Bluetooth function by using the
INPUT. Appears “BLUE” and Bluetooth icon blink
quickly in the display window.

2. Operate the Bluetooth device and perform the
pairing operation. When searching for this unit
with the Bluetooth device, a list of the devices
found may appear in the Bluetooth device
display depending on the type of Bluetooth
device. Your unit appears as “LG-RK4”.

Operating 17

Note

,

Depending on the Bluetooth device type, some
devices may have a different pairing process.
Enter the PIN code (0000) as needed.

3. When this unit is successfully connected with
your Bluetooth device, “CONN” appears on the
display window.

4. Listen to music.
To play a music stored on your Bluetooth device,
refer to your Bluetooth device’s user guide.

Note

,

yWhen using Bluetooth technology, you have

to make a connection between the unit and
the Bluetooth device as close as possible and
keep the distance.
However, it may not work well in certain
situations as described below :

- There is a obstacle between the unit and
the Bluetooth device.

- There is a device using same frequency

with Bluetooth technology such as a
medical equipment, a microwave or a
wireless LAN device.

yYou should connect your Bluetooth device to

this unit again when you restart it.

yIf Bluetooth connection does not work well,

try pairing it again.

yTo connect a new Bluetooth device,

disconnect the currently connected

Bluetooth device and connect a new
Bluetooth device.

Note

,

yThe sound may be interrupted when the

connection has interference from other
electronic devices.

yYou may not control the Bluetooth device

with this unit.

yDepending on the type of the device, you may

not be able to use the Bluetooth function.

yYou can enjoy wireless system using phone,

MP3, Notebook, etc.

yThe more distance between the unit and the

Bluetooth device, the lower the sound quality
becomes.

yBluetooth connection will be disconnected

when the unit is turned off or the Bluetooth
device gets too far from the unit.

yWhen Bluetooth connection is disconnected,

connect the Bluetooth device to the unit

again.

yWhen you use the Bluetooth function,

adjust the volume to a proper level on the
Bluetooth device.

yIf you change the function, the Bluetooth

function is disconnected.

yWhen you select the Bluetooth function,

the unit will be connected to already paired
Bluetooth device.

3

Operating

Operating18

Other Operations

Using Microphone

1. Connect your microphone to the MIC jack.

2. Play the music you want.

3. Sing along with the accompaniment. Adjust
the microphone volume by rotating MIC VOL
clockwise or counterclockwise on the unit.

Note

,

y When not using the microphone, set the

MIC VOL to minimum or turn off the MIC

3

Operating

and remove the microphone from the MIC
jack.

y If the microphone is set too near the speaker,

a howling sound may be produced. In this
case, move the microphone away from the
speaker or decrease the sound level by using

the MIC VOL.

y If sound through the microphone is extremely

loud, it may be distorted. In this case, rotate
MIC VOL to minimum.

y You can’t adjust microphone’s volume by

using the MUSIC VOL. Microphone’s volume
can be adjusted by MIC VOL.

LIGHTING

You can turn on or off lighting effect by pressing
LIGHTING button.

Note

,

yLighting function is available in all functions.

yDo not look directly at the light emitting part

when the LIGHTING is turned on.

yIf the illumination brightness is glaring, switch

on the room lights or turn off the LIGHTING.

Adjusting the ECHO volume

You can give an echo effect to the sound from the
microphones.

Rotate the ECHO VOL to increase the echo volume
or decrease it.

Setting the USER EQ

You can adjust the sound level of Bass and Treble as
your preference.

Rotate BASS VOL or TREBLE VOL to adjust the
sound level.

Troubleshooting

General

Problem Cause & Solution

yTurn off the power of this unit and the connected external device (Woofer,

The unit does not work
properly.

No Power.

No sound.

DVD-player, Amplier, etc.) and turn them on again.

yDisconnect the power cord of this unit and the connected external device

(Woofer, DVD-player, Amplier, etc.) and then try connecting again.

yPrevious setting may not be saved when device power is shut off.

yThe power cord is not plugged in. Plug in the power cord.

yCheck whether electricity failed.

Check the condition by operating other electronic devices using the same AC
outlet.

yCheck whether you select right function.

Press function button and check if you have selected the right function.

Troubleshooting 19

4

Troubleshooting

Appendix20

General specifications

General

Power requirements Refer to the main label on the unit.

Power consumption Refer to the main label on the unit.

Model : DA-50F25

AC adapter

Dimensions (W x H x D)

Operating temperature 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity 60 %

Inputs

Analog audio in (LINE IN) 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R)

Analog audio out (LINE OUT) 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R)

Microphone (MIC 1/2) Sensitivity 20 mV (1 kHz), 6.3 mm jack x 2

Manufacturer : ASIAN POWER DEVICES INC.

Input : 100 - 240 V ~ 50/60 Hz

Output : 25 V 0 2 A

Approx. 442 mm X 710 mm X 356 mm

5

Appendix

System

Frequency Response 80 to 20,000 Hz

Signal-to-noise ratio More than 75 dB

Dynamic range More than 80 dB

Bus Power Supply (USB) 5 V 0 500 mA

Amplier (RMS Output power)

Total output 80 W (3 Ω at 1 KHz, 10 % THD)

yDesign and specications are subject to change without notice.

Appendix 21

Maintenance

Handling the Unit

When shipping the unit

Please save the original shipping carton and packing
materials. If you need to ship the unit, for maximum
protection, re-pack the unit as it was originally
packed at the factory.

Keeping the exterior surfaces clean

Do not use volatile liquids such as insecticide spray
near the unit. Wiping with strong pressure may
damage the surface. Do not leave rubber or plastic
products in contact with the unit for a long period of

time.

Cleaning the unit

To clean the player, use a soft, dry cloth. If the
surfaces are extremely dirty, use a soft cloth lightly
moistened with a mild detergent solution. Do not use
strong solvents such as alcohol, benzine, or thinner,
as these might damage the surface of the unit.

Trademarks and Licenses

The Bluetooth® word mark and logos are registered
trademarks owned by the Bluetooth SIG, Inc. and
any use of such marks by LG Electronics is under
license.

Other trademarks and trade names are those of their
respective owners.

5

Appendix