DS18 MRX300 User manual

USB Media Player Instruction Manual
Please read the instruction manual carefully before operating the unit

Table of Contents
1. Safety Instruction………………………………………………..……………… 01
2.Specifications………………………………………….………………………….. 02
3.Installation/ Mounting………………………………………………………… 03
4.Wiring Connection……………………………………………………………… 05
5.Basic Operation…………………………………………………………………… 07
6.Function setting/Operation………………………………………………… 09
Setting………………………………………………………………………………… 09
Radio (AM/FM/WB) Operation…………………………………………… 09
USB Operation…………………………………………………………………… 09
AUX (Auxiliary Input) Operation………………………………………… 10
Bluetooth Operation…………………………………………………………… 10
7.Troubleshooting………………………………………………………………… 11

Safety Instruction
This symbol with ‘’CAUTION〃is intended to alert the user to
the presence of important instructions. Failure to heed the instructions could result
in injury or unit damage.
To prevent injury and damage to the unit, please read and follow the instructions in
this manual.If you feel unsure about installing this system yourself, have it installed
by a qualified DS18 technician.
Before installation, disconnect the battery negative (-) terminal to prevent damage to
the unit, fire and/or possible injury.

Specifications
Model
MRX300D
Operating Voltage
10.5V-16V
Power Output
25 W X 4 @ 4 Ohms RMS
50 W x 4 @ 2 Ohms Peak
Max. RCA Output Voltage
4V
Output Impedance
500Ω
Frequency Response
20 – 20 KHz
Receipt FM Frequency Range
87.5 - 107.9 MHz
Receipt AM Frequency Range
530 – 1710 KHz
Receipt WB Frequency Range
162.40-162.55 MHz
Tuner Presets
18 FM / 12 AM/6WB
Display
3” Full TFT Gorilla Glass
Bluetooth
5.0+EDR, A2DP
USB Compatibility
2.0
USB Capacity
64 GB max
USB Charger
2A
Audio File Compatibility
MP4,MP3, WMA

Installation/ Mounting
Installation
1. Main Unit 2. Power/Speaker Harness
3. Screws X 2PCS 4. Hex Head Screws X 2PCS
5. U Bracket 6. Instruction Manual
1. This player should be installed by professional technician.
2. Please read the instruction and operation of equipment carefully before installing.
3. Make sure to connect other wires before power connection.
4. To avoid short circuit. Please make sure all the exposed wires are insulating.
5. Please fix all the wires after installation.
6. Please make connection to the player accordingly to this instruction manual. Wrong
connection may cause damage.
7. This player only fit for 12V DC device and please make sure your boat belongs to this
kind of cathode grounding electrical system.
8. Please connect the wires rightly. Wrong connection will cause malfunction or damage
the electrical system.

Mounting (Using U Bracket)
To mount the unit, you will need to find a flat surface with adequate clearance
behind it that provides enough clearance for the unit and all it’s necessary wiring.
1.Once you have determined a mounting location, you will need to cut a circular
hole 3〃(77mm) in diameter.
2. After the hole is cut slide the unit and wiring through the hole.
3. Take the U bracket and slide over the two studs on the back of the
unit. Tighten down with supplied nuts.
4. Plug in all wiring harnesses and cables. Refer to the wiring diagram
for wire harness connection types.

1. This player can only be used by the 12V DC cathode grounding electrical system.
2. Don’t connect the terminals of the battery until the player is absolutely with well
erection joint.
3. Please make sure to connect the yellow wire to the positive of the battery(+).
4. When change the fuse. Please make sure the specifications are same.
5. Using good quality speaker with 4 ohm can result in the best effect of the equipment.

Basic Operation
POWER/ button
Press button to turn on. Press the key again to turn off the unit.
BAND / button
Press BAND button to FM1/FM2/FM3/AM1/AM2/WB. Press and hold BAND button for 3
seconds to auto store the stations.
DIM button
Press the DIM key to control the brightness of the light.
ZONE button

Press ZONE button to ZONE1 / ZONE2 / ZONE3.
PLAY/PAUSE button
In RADIO/AUX source press button for MUTE on/off function. In USB/BT source,
press button for Pause/Play function.
Seek UP button
In RADIO source, shortly press button to Seek up, press and hold the button to
show next station. In USB/BT source press button to next song / file, press
and hold the button to fast forward play.
Seek down button
In RADIO source, shortly press button to Seek down, press and hold the button to
show back to the previous station. In USB/BT source press button to previous
song / file, and press and hold the button to play back quickly.
MENU button
Press the MENU key to display the main interface.
VOL/SEL button
Rotate the Vol to adjust the volume.

Bluetooth Operation
After your device is paired to the source unit, this feature allows you to control playback your
device directly from the unit. Press SRC button to select the BLUETOOTH source option. Then
searching and selecting the Bluetooth device “MRX” from your phone and input
password “0000” If it needs. When paired successfully, the BT symbol will be shown on TFT.
To play or pause a song, short press the PLAY/PAUSE button.
To skip a track forward, short press the FWD button. To skip a track
backwards, short press the REV button.
To access USB specific settings, Press and hold SEL button for the list
of settings (Random play>Repeat). Use the encoder to select
the option to change

FCC WARNING
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmfulinterference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
Any changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
NOTE: This equipment has been testedand found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and canradiate radio frequency energyand, if not installed and used in
accordance with the instructions, may cause harmfulinterference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
-- Consult the dealer or an experienced radio/TV technician for help.
To maintain compliance with FCC’s RF Exposure guidelines, This equipment should be
installed and operated with minimum distance between 20cm the radiator your body: Use
only the supplied antenna.