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.