OWNER’S MANUAL

MRX300D

MARINE & POWERSPORT HEAD UNIT

(3) ZONES with Independent Volume and Tone Control

Digital Audio Broadcasting

Full Color Display

INTRODUCTION

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Thank you for choosing the MRX300D! Your choice in the MRX Series of head unit indicates a desire for high quality music reproduction. The MRX Series is the result of decades of marine audio expertise.

The MRX300D offers complete control over your marine audio system’s reproduction. These models feature even more ways to access the music you love from the comfort of your boat. This high powered head unit delivers insane amounts of power for it’s size, and allows access to BT streaming, AUX Input, USB Operation, and Radio Access. Simply put, there is no marine head unit that can compare to the sophistication, beauty, and precision of the MRX300D.
To make sure your MRX300D performs at its peak, please read, and follow the instructions in this manual. Professional installation by an authorized DS18 dealer is highly recommended!
Your system is one step closer to being complete with the MRX300D!

FEATURES

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GENERAL

• AM/FM tuner + DAB+
• 30 Radio Presets (18FM/12AM)
• Universal round mounting hole
• Low Voltage Warning Alert
• IPX 6 Rating & UV/Salt resistance
• EEPROM type to store data when power is disconnected

DISPLAY

• 3” Full Color TFT Display
• Screen with Gorilla Glass and Wet Bonded
• Adjustable 7 Colors backlit Buttons
• Rubber Buttons and Rotatory Knob for easy operation

AUDIO

• 3 Zone with Independent Vol and Tone Control
• Zone 1: L+R+SubW / Zone 2: L+R+SubW/ Zone3: L+R+SubW
• 2 Band EQ (Bass, Treble) independent on each zone
• 4.5 Volts Pre-amp output
• 25W X 4 RMS @ 2 ohm Stable
• 50W X 4 MAX @ 2 ohm Stable

CONNECTIVITY

• Bluetooth v5.0 for superior audio streaming
• USB Port for Music &2.1AmpCharger
• Supports up to 64Gb of MP3 and WMA files
• Audio Aux input
• Wired Remote Input (Compatible with MXRC)
• Rearview Camera Video Input

INSIDE OF THE BOX

• Main Unit
• Power/Speaker Harness
• Screws X 2PCS
• Hex Head Screws X 2PCS
• U Bracket
• Instruction Manual

SAFETY INSTRUCTION

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CAUTION
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 technician.

1. Before installation, disconnect the battery negative (-) terminal to prevent damage to the unit, fire, and / or possible injury. 
2. This player can only be used by the 12V DC cathode grounding electrical system.
3. Do not connect the battery terminals until the player is fully assembled. 
4. Please make sure to connect the yellow wire to the constant power battery (+).
5. If you need to replace the fuse, make sure the fuse size and capacity are the same.
6. Using good quality 4-2 ohms speaker can enhance the audio performance of the system. 
7. Make sure to start connecting other wires before power connection. 
8. To avoid a short circuit, please make sure all the exposed wires are insulated with marine grade butt connectors. 
9. Please make the connections to the player according to this instruction manual, a wrong connection may cause damage and may void warranty.

INSTALLATION/ MOUNTING

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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 its necessary wiring.

1. Once you have determined a mounting location, you will need to cut a circular hole 3″ (76.2 mm) 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. DASHBOARD

CUTTING SIZE

MOUNTING BRACKET

1. BREAK LINES

WIRING CONNECTION

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1. RED
2. REMOTE +12V OUT (Connect to MXRC)
3. BLACK
4. WIRED REMOTE CONTROL (MXRC)
5. USB
6. RADIO ANTENNA
7. GREY
8. WHITE (FRONT ZONE 1 LINE OUT LEFT)
   RED (FRONT ZONE 1 LINE OUT RIGHT)
9. WHITE (CENTRAL ZONE 2 LINE OUT LEFT)
   RED (CENTRAL ZONE 2 LINE OUT RIGHT)
10. GREEN
11. WHITE (REAR ZONE 3 LINE OUT LEFT)
    RED (REAR ZONE 3 LINE OUT RIGHT
12. WHITE (AUX IN LEFT)
    RED (AUX IN RIGHT)
13. GREY/BLACK
14. GREEN/BLACK
15. BLUE
16. PURPLE
17. WHITE
18. WHITE/BLACK
19. PURPLE/BLACK
20. YELLOW
21. DAB AMT(SMB)
22. BROWN
23. CAMERA TRIGGER
24. CAMERA IN
25. REAR ZONE 3 SUB
26. CENTRAL ZONE 2 SUB
27. FRONT ZONE 1 SUB

         
SECTION A                SECTION B

PIN NO.	WIRE COLOR	WIRE DEFINITION	AWG
1	BLACK	GROUND (-)	16
2	PURPLE/BLACK	SPEAKER REAR RIGHT (-)	20
3	PURPLE	SPEAKER REAR RIGHT (+)	20
4	BLUE	REMOTE / ANTENNA OUTPUT (+12v)	20
5	GREEN/BLACK	SPEAKER REAR LEFT (-)	20
6	GREEN	SPEAKER REAR LEFT (+)	20
7	RED	ACC (+12V)	20
8	GREY/BLACK	SPEAKER FRONT RIGHT (-)	20
9	GREY	SPEAKER FRONT RIGHT (+)	20
10	YELLOW	BATTERY (+12V IN)	16
11	WHITE/BLACK	SPEAKER FRONT LEFT (-)	20
12	WHITE	SPEAKER FRONT LEFT (+)	20

ZONE 1 OUTPUTS:

SPEAKER FRONT OUTPUT LEFT & RIGHT
RCA FRONT (ZONE 1) LINE OUT LEFT & RIGHT
RCA FRONT (ZONE 1) SUBWOOFER OUT

ZONE 2 OUTPUTS:

SPEAKER REAR OUTPUT LEFT & RIGHT
RCA CENTRAL (ZONE 2) LINE OUT LEFT & RIGHT
RCA CENTRAL (ZONE 2) SUBWOOFER OUT

ZONE 3 OUTPUTS:

RCA REAR (ZONE 3) LINE OUT LEFT & RIGHT
RCA REAR (ZONE 3) SUBWOOFER OUT

BASIC OPERATION

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KEYS	ACTION	STAND BY	RADIO	USB	AUX	BT MUSIC	DAB+
	SHORT	POWER ON	MUTE ON/OFF	MUTE ON/OFF	MUTE ON/OFF	MUTE ON/OFF	MUTE ON/OFF
	LONG	/	POWER OFF	POWER OFF	POWER OFF	POWER OFF	POWER OFF
BAND	SHORT	/	FM-AM	MUSIC-MOVIE-PHOTO	/	/	AUTO STORE
	LONG	/	AUTO STORE	/	/	/	BROWSE DAB STATION LIST
DIM	SHORT	/	DARK / BRIGHT	DARK / BRIGHT	DARK / BRIGHT	DARK / BRIGHT	DARK / BRIGHT
	LONG	/	CAMERA ON/OFF	CAMERA ON/OFF	CAMERA ON/OFF	CAMERA ON/OFF	CAMERA ON/OFF
ZONE	SHORT	/	FRONT ZONE CENTRAL ZONE REAR ZONE	FRONT ZONE CENTRAL ZONE REAR ZONE	FRONT ZONE CENTRAL ZONE REAR ZONE	FRONT ZONE CENTRAL ZONE REAR ZONE	FRONT ZONE CENTRAL ZONE REAR ZONE
	LONG	/	FRONT SUB CENTRAL SUB REAR SUB	FRONT SUB CENTRAL SUB REAR SUB	FRONT SUB CENTRAL SUB REAR SUB	FRONT SUB CENTRAL SUB REAR SUB	FRONT SUB CENTRAL SUB REAR SUB
	SHORT	/	/	PAUSE/PLAY	/	PAUSE/PLAY	SET FAVORITE STATIONS
	LONG	/	RDS: ON/OFF	RPT-RDM-RPT ALL	/	/	/
	SHORT	/	SEEK UP	NEXT FILE	/	NEXT FILE	NEXT STATION
	LONG	/	MANUAL TUNE UP	FAST FOWARD	/	/	/
	SHORT	/	SEEK DOWN	PREVIOUS FILE	/	PREVIOUS FILE	PREVIOUS STATION
	LONG	/	MANUAL TUNE DOWN	FAST REVERSE	/	/	/
MENU	SHORT	/	SETTING MENU /BACK	SETTING MENU /BACK	SETTING MENU /BACK	SETTING MENU /BACK	SETTING MENU /BACK
	LONG	/	STATION LIST	SONG LIST			STATION LIST
SEL/ VOL	SHORT	/	ZONES/SELECT OK	ZONES/SELECT OK	ZONES/SELECT OK	ZONES/SELECT OK	ZONES/SELECT OK
	LONG	/	SYSTEM SETTINGS	SYSTEM SETTINGS	SYSTEM SETTINGS	SYSTEM SETTINGS	SYSTEM SETTINGS

MODE OPERATION

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RADIO (AM / FM) OPERATION

Press MENU button to select the Radio source option and shortly press BAND button to FM / AM and then rotate the Vol to select, press the encoder to confirm your selection.

To auto seek station, press and hold BAND button for 3 seconds to auto store radio station.

To manually tune to a station, briefly press the / buttons. To Seek up/down the radio stations, press and hold the / buttons. To go to the next/previous station, continue holding the / .

To check Station List, press and hold MENU button.

To RDS setting, press and hold button to select RDS setting (AF ON/OFF, TA ON/OFF etc.) and then rotate the Vol to select, press the encoder to confirm your selection.

USB OPERATION

Once your device is connected to the source unit, this feature enables you to manage your device’s playback directly from the unit. Press the MENU button to choose the USB source option, then briefly press the BAND button to cycle between Music, Movie, and Photo modes. Next, use the Volume knob to make your selection, and press the encoder to confirm your choice.

To play or pause a song, briefly press the button. Press and hold the button to cycle between Repeat (RPT), Random (RDM), and Repeat All (RPT ALL) modes. Then, use the Volume knob to make your choice and press the encoder to confirm.
For changing to the Next File or Previous File, briefly press the / buttons. To skip a track forward or backward, press and hold the / buttons to activate Fast Forward or Fast Reverse mode.

To check Song List, press and hold MENU button.

AUX (AUXILIARITY INPUT) OPERATION

After your device is plugged into the source unit, this feature allows you to play music from your device. Press MENU button to select the AUX source option and use your plugged-in device to control song/ track selection, play/pause and track skip Fast Forward/Fast Reverse.

BLUETOOTH OPERATION

After your device is paired to the source unit, this feature allows you to control the playback of your device directly from the unit. Press the MENU button to select the BLUETOOTH source option.

To begin, search for and select the Bluetooth device labeled “MRX300D” on your phone. If prompted, input the password “0000”. Once the pairing is successful, you will see the Bluetooth symbol displayed on the screen.

To play or pause a song, simply press the button briefly.

To switch to the Next File or Previous File, just briefly press the /  buttons.

DAB OPERATION

To access DAB functionality, press the MENU button and choose the DAB source option. For automatic radio station storage, briefly press the BAND button.

To browse through the list of DAB stations, press and hold the BAND button. To mark stations as favorites, simply press the button briefly.

To manually seek a station, briefly press the /  buttons for Next/Previous Station.

To view the complete Station List, press and hold the MENU button.

SETTINGS MENU

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SETTINGS MENU

To access the unit settings, short press MENU button, rotate the encoder to the SETTING icon and then press to confirm. Rotate the encoder to scroll through the list of setting and short press the encoder button to select the setting you wish to change. (Language>Area>Front Zone Audio>Central Zone Audio> Rear Zone Audio>Beep>Buttons Color>Theme>Wallpaper>Clock Setting>Version> Reset)

LANGUAGE

Rotate the encoder to select the Language (English > Français > Español > Portuguese > Chinese) and then short press to confirm your selection.

AREA

Rotate the encoder to select the Area (Europe/USA) and then short press to confirm your selection.

FRONT ZONE AUDIO/CENTRAL ZONE AUDIO /REAR ZONE AUDIO

Rotate the encoder to the Zone audio setting (Bass> Treble>Balance>Subwoofer (Off/ 80Hz/120Hz /160Hz)> EQ (S.Bass / Vocal / Powerful / Clarity) > Loud) and then short press to confirm your selection. Short press MENU button to exit and go back up one level.

BEEP

Rotate the encoder to turn the Beep sound ON/Off and then short press to confirm your selection.

BUTTONS COLOR

Rotate the encoder button to select the Buttons Color Options (Auto Color> Red > Green> Blue> Purple> Yellow> Cyan> White) and then short press to confirm your selection.

THEME

Rotate the encoder button to select the Buttons Color Options (Night/ Day) and then short press to confirm your selection.

WALLPAPER

Rotate the encoder to select the wallpaper and then short press to confirm your selection.

CLOCK SETTING

Rotate the encoder to select the clock setting (Clock Format/Clock Adjust) and then short press to confirm your selection. Short press MENU button to exit and go back up one level.

CLOCK FORMAT

Select the time format 12H or 24H

CLOCK ADJUST

Adjust the Hours and Minutes

VERSION

The firmware version of the unit will be displayed.

RESET

Rotate the encoder to select Yes/No , selecting Yes will reset your unit back to factory default settings.

       

SPECIFICATIONS

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Operating Voltage ………………………………… 10,5 – 16 Volts
Low Voltage Warning Alert …………………… YES (< 10.5V)
Waterproof Rating ………………………………….. IPX6
UV/Salt Protection ……………….. YES, B117 Salt Fog & D4329 UV Exposure Tested
Buttons …………………………… Rubber + RGB Backlit 7 Colors Selectable (Auto/White/Red/Blue/Green/Purple/Cyan/Yellow)
Screen Panel ………………… Gorilla Glass with Wet Bonded Display

DISPLAY:
Type ………………………….. Thin Film Transistor (TFT) Display
Resolution …………………. 640*360 pixel, IPS

AUDIO:
Power Output:
RMS ……………………………………………. 4 x 18W @ 4ohm
4 x 25W @ 2ohm
MAX …………………………………………… 4 x 50W @ 2ohm
Minimum Load ……………………………. 2 ohm Stable per Channel
Frequency Response ……………………. 20 Hz – 20 kHz
RCA Pre-Out Voltage ………………….. 4.5 Volts
Output Impedance ……………………….. 500ohm
Equalizer ………………………………………. 2 Bands (Bass 80Hz, Treble 12Khz)
Presets …………………………………. YES (S-Bass / Vocal /Powerful / clarity)
Subwoofer Control ……………….. Level (0 to -40)
Audio Zones …………………………. 3 Zones (Stereo + Subwoofer each)
Independent Zone Control ……. YES (Level/Tone)
Audio Input …………………………….. L+R RCA (Aux Input)

TUNER:
FM Frequency Range ………………… 87.5 – 108 MHz
AM Frequency Range ………………… 522 – 1620 KHz
Tuner Presets ……………………………… 18 FM / 12 AM
Radio Data System ……………………… YES (AF/TA/NEWS) Selectable

DAB:
Frequency Range ………………… 174.928-239.200 MHz
Sensitivity …………………………….. 93 dB
Stereo separation …………………. 50 dB at 1 kHz

CONNECTIVITY:
Bluetooth Version …………………… 5.0 + EDR
Audio Streaming ………………………. A2DP
USB Compatibility …………………….. v2.0
USB Capacity ……………………………… 64 Gb Max
USB Charge Capacity …………………… 2.1Amp
Audio Files Compatibility …………….. MP3, WMA
Remote Control ……………… Wired 3.5mm Jack Input (Compatible with MXRC)

MEASUREMENTS

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WARRANTY

Please visit our website DS18.com for more information on our warranty policy

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We reserve the right to change products and specifications at any time without notice.
Images may or may not include optional equipment.

WARNING:
Cancer and Reproductive Harm.
www.P65Warning.ca.gov

TROUBLESHOOTING

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TROUBLE	CAUSE	SOLUTION
Basic
Unit does not turn on	Blown fuse	Check fuse of the unit, replace with correct rating.
	Vehicle’s ignition is off	If connected following the instructions, the unit will not operate with ignition off
	Voltage applied to Red wire is not between 10.5 & 16 volts or there is no voltage present.	Check battery, connections and fuses and repair or replace as necessary. If voltage is above+ 16 volts, have the electrical system inspected by an authorized service center.
	Unit is not properly grounded.	Check wiring and repair as necessary.
Radio Tuner
Tuner fails to tune any stations	No antenna or disconnected or open connection in cable.	Check all connections and repair as necessary.
Unable to tune stations in seek mode	You are in a weak signal area.	Make sure the tuner LOC mode is off.
USB Devices
USB device cannot be inserted	The USB device has been inserted in the wrong direction.	Reversing the connection direction of the USB device, try reinserting.
	The USB device connector is broken.	Replace with a new USB device.
USB device is not recognized	The USB device is damaged.	Disconnect USB device and reconnect. If the device is still not recognized, try replacing with a different USB device.
	Connectors are loose.
No Sound heard with the display “No File” shown	No MP3 / WMA files are stored on the USB device.	Store these files properly on the USB device.
Sound skip or is noisy	MP3 / WMA files are not created properly.	Use MP3/WMA files that are encoded correctly.
MP3 is not playing back	Writing error occurred. The MP3 format is not compatible.	Make sure MP3 has been written in a supported format.
BLUETOOTH
Cannot pair BT	The BT function of the device is not enabled.	Refer to the user manual of the device for how to enable the BT function.
The audio quality is poor after connection with a BT enabled device	The BT reception is poor.	Move the device closer to the audio system or remove any obstacle between the device and the system antenna.

Declaration
Hereby, SPIRIT LLC declares that this product is in compliance with the essential requirements and other relevant provisions of Directive 2014/53/EU. You can find the Declaration of Conformity on www.ds18.com

FOR MORE INFORMATION PLEASE VISIT DS18.COM

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Documents / Resources

DS18 MRX300D Marine and Powersport Head Unit [pdf] Owner's Manual MRX300D Marine and Powersport Head Unit, MRX300D, Marine and Powersport Head Unit, Powersport Head Unit, Head Unit, Unit

References

• User Manual