Nav TV Zen M User manual

Mercedes Benz NTG5+ MOST150 to 12-channel Analog & Digital sound processor
NTV-KIT871
3950 NW 120th Ave, Coral Springs, FL 33065 TEL [phone] FAX [phone]

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ZEN-M Interface
NTV-ASY272
ZEN RCA Harness
NTV-HAR315
The NAV-TV ZEN-M processor seamlessly converts late model Mercedes factory MOST-150 audio bus to 12-
channel analog RCA and TOSLink output. Adding aftermarket amplifiers to the OE NTG5, 5.1, 5.2 or 5.5 system
has never been so simple and seamless. This kit integrates with the OEM M.O.S.T.® bus to retain volume
control, full fade and balance (analog only), treble, mid-range, bass control & Bluetooth voice calls with no
external speaker (true OEM integration). NOTE: vehicles not equipped with a factory amplified system must be
flashed with NAV-TV’s ZEN-M-PRG (NTV-KIT866, sold separately) prior to installation. Vehicles equipped with
an OEM amplifier do not need to be flashed.
ZEN-M overview
Overview
Kit Content
ZEN Power Harness
NTV-HAR316
USB Cable (updates)
NTV-CAB009
Power
connector
USB (updates)
TOSLink output
MOST 150 fiber input
--NOT USED--
Analog RCA outputs
WARNING: Do not connect any RCA cables to the ZEN-M interface or
additional processors prior to properly grounding aftermarket amplifier(s)!
DIP switches
Status LED
--NOT USED--
ZEN MOST Fiber
NTV-CAB134

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NOTE: All vehicles require NTG5+
radio, regardless if listed on this
chart. See radio shots (below) to
gain an idea of what to look for.
NTG5, 5.1, 5.2, 5.5
ZEN-M Compatibility (NTG5, NTG5.1, NTG5.2, NTG5.5)
Month, Year(s)
Make
Chassis
Model
09/2015+
Mercedes
W176
A-Class
11/2014+
Mercedes
W246
B-Class
Any 2014+
Mercedes
W205
C-Class Sedan
Any 2015+
Mercedes
C205
C-Class Coupe
03/2015+
Mercedes
X117
CLA-Shooting B
08/2014+
Mercedes
X218
CLS-Shooting B
08/2014+
Mercedes
W218
CLS Coupe
11/2014+
Mercedes
W212
E-Class Sedan
06/2015+
Mercedes
C207
E-Class Coupe
10/2016+
Mercedes
W463
G-Class
09/2016+
Mercedes
X166
GL
09/2015+
Mercedes
X156
GLA
Any 2016+
Mercedes
X253
GLC
Any 2016+
Mercedes
C292
GLE
11/2015+
Mercedes
X166
GLS
Any 2015+
Mercedes
C190
GT AMG
08/2015+
Mercedes
W166
ML
Any 2016+
Mercedes
R172
SLC
Any 2014+
Mercedes
C217, W222, X222
S-Class
Any 2014+
Mercedes
W447
V
Any 2015+
Mercedes
X222
Maybach

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Wire Side
*This remote wire must be used for aftermarket amplifier remote for proper functionality. If installing more than
one amplifier/DSP, a relay must be used for reliable turn-on (500mA max).
*NOTE: DownMix ON mixes vocals from center channel into Front and Rear L+R output channels.
ZEN-M Installation
1. If this vehicle has a factory amplifier, it must be removed and the ZEN-M can be installed into its place.
If this vehicle is not amplified from factory, install the ZEN-M behind the radio.
2. Connect the following wires from the
provided power harness:
3. Before connecting power to the ZEN-M, adjust dip-switch settings for the desired
options:
4. If using analog RCAs for signal to the amplifier, connect according to the reference chart below.
WARNING: Do not connect RCA cables to this interface until all amplifiers/external processors are
properly grounded. Failure to do this may cause damage to the interface and VOID the warranty!
1
2
3
4
5
6
7
8
9
10
11
12
Left
Front
Right
Front
Left
Front
Right
Front
Left
Front
Right
Front
Left Rear
Door
Right Rear
Door
Left Rear
Center
Right Rear
Center
Center
Sub
5. If using TOSLink for signal to the amplifier, connect the cable to the TOSLink port shown on page 2.
NOTE: both Analog and Digital output sound simultaneously, regardless of which type is used.
6. Connect the provided MOST Fiber Cable from the (previously removed) amplifier, or from the radio’s
fiber port to the MOST port on the ZEN-M. NOTE: if fiber already exists at the head unit (for SAT radio,
etc), you must add the provided MOST fiber cable into the OEM MOST loop (see next page).
ZEN-M pin
Color
To vehicle:
1
Yellow
12v (+) Constant
3
Violet
--Reserved, NOT USED--
4
Black
Ground (-)
6
Blue
12v (+) remote output*
Time
Alignment
Attenuation
TOSLink
DownMix*
Loudness
Vehicle Settings
Position
DIP 1
DIP 2
DIP 3
DIP 4*
DIP 5
DIP 6
UP
(off)
Front Row
Full Scale
output (0 dB)
DownMix ON
Loudness
OFF
OFF
OFF
DOWN
(on)
Driver Focused
-12 dB output
DownMix OFF
Loudness ON
OFF
OFF

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*NOTE: in this scenario, the vehicle still must be programmed for external amp (see red note above).
ZEN-M General Installation Notes
•This interface can be installed in vehicles with or without an amplifier & with or without MOST fiber
optic presently installed.
1. Vehicles with fiber amplifier: the amplifier must be removed. Connect the OEM fiber previously
connected to the amp, directly into the ZEN-M.
2. Vehicles without OEM amplifier or MOST fiber: Use the supplied fiber optic extension and
connect from the fiber port behind the radio to the MOST fiber port on the ZEN-M. NOTE: If the
vehicle is not equipped with an OEM amplifier, you must program the system for external
amplifier for the ZEN-M to operate properly. Use NAV-TV’s ZEN-M-PRG programmer (NTV-
KIT866 sold separately).
3. Vehicles without amplifier but still equipped with fiber*: Disconnect the fiber from the radio,
disassemble the fiber coupler and route the provided MOST extension into the factory MOST
loop like shown below (to continue proper MOST data flow):
•Tuning tips:
1. Before beginning tuning process (especially with external EQ/Processors), set Bass & Treble on
the head unit for each source to flat (0).
2. Begin with amplifier/EQ gains all the way down.
3. With dynamic music playing, adjust the radio volume to maximum.
4. Adjust the amplifier/EQ gains to desired maximum level.
•For Mercedes, there is no separate dedicated subwoofer control.
•NOTE: The CENTER Channel in some Mercedes vehicles is a DUAL-VOICE coil speaker –one coil is
connected to the factory amp the other coil connects to the OEM EMBRACE module –see page 9 for
wiring diagram.

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For ZEN-M installations, the
factory amplifier MUST be
removed (if equipped).
Multi-Color LED Status Indication
ZEN-M System Layout (analog)
LED Status
Indication
Solid Red
MOST Active
Violet
MOST traffic commands
Blinking Red
Peaking (maximum digital signal level achieved)
Blinking Blue
PC Link with app (future use)

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For ZEN-M
installations, the
factory amplifier
MUST be removed
(if equipped).
ZEN-M System Layout (digital TOSLink)
Mercedes Benz options for audio control
When flashing the vehicle for fiber (if not factory fiber or amp-equipped) using the NAV-TV ZEN-M-PRG
(KIT866), the OEM Mercedes sound system will allow Bass, Treble and Midrange controls.
•There is no separate subwoofer controller for Mercedes-Benz.

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*Mixed Stereo: (Left = LeftFront + Center + LeftSurround + LFE), (Right = RightFront + Center + RightSurround + LFE)
**LFE: Low Frequency Effects: Surround subwoofer output.
ZEN DownMix Scenario Examples
Source Signal
DownMix
TOSLink
Output
Analog
FRONT OUT
Analog
SIDE OUT (7,8)
Analog REAR
OUT (9,10)
Center
Channel OUT
SUB
OUT
2 Channel (Music)
ON
Stereo
Stereo Front
Stereo Rear
Stereo Rear
Muted
Mono
(L+R)
2 Channel (Music)
OFF
Stereo
Front
Stereo Front
Stereo Rear
Stereo Rear
Center
Mono
(L+R)
5.1
Surround
ON
Mixed
Stereo*
Front +
Center
Rear +
Center
Rear +
Center
Muted
Mono
(L+R)
5.1 Surround
OFF
Stereo
Front
Stereo
Front
Rear Back
Surround
Rear Back
Surround
Center
LFE**
7.1 Surround
ON
Mixed
Stereo*
Front + Center
Rear + Center
Rear +
Center
Muted
Mono
(L+R)
7.1 Surround
OFF
Stereo
Front
Stereo Front
Side Surround
Rear Back
Surround
Center
LFE**
Left Front
Right Front
Left Side
Right Side
Left Back Surround
Right Back Surround
Subwoofer
Center Channel

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Mercedes OEM Center Channel schematic
•The center channel
speaker in all NTG5+
Mercedes vehicles
are a Dual-Voice
Coil speaker. If
replaced, and not
reconnected to the
EMBRACE module
(wires), you will lose
audio from the
emergency
telematics system.
Use the diagram
here to connect a
secondary speaker
(or use the OE
speaker) directly to
the EMBRACE
module (Gray/Red
+, Gray -).

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ZEN-M Technical Specifications
Hardware & Software
Current HW version:
--1r0--
Current SW version:
ZEN-M-1.2-4-20-18
Compatible SW (update) OS:
Windows 7 (64 bit), 8, 10
INPUT
Digital Input
MOST 150 Fiber Optic
OUTPUT
Digital Outputs:
TOSLink
Digital Outputs supported:
24bit/48kHz
Frequency Response (digital):
18Hz –24kHz
Analog Outputs:
12 channels (RCA)
Output Voltage Peak:
6v
Output Voltage RMS:
2.1v
Analog Output Type:
Single-Ended
S/N Ratio (analog):
123dB
Frequency Response (analog):
18Hz –24kHz
THD+N @ -1dBFS
-94dB
DAC
48kHz 32bit
DSP
128bit Floating Point
Delay (Time Alignment)
Selectable
Power Supply
Current Consumption Stand-by
<1 mA
Current Consumption Operational
350 mA MAX
Operational Voltage
7V –20V DC
Amp Turn-On Output
Automatic
Amp Turn-On Voltage
V-batt
Amp Turn-On Current Limitation
500mA
Other
Dimensions:
4”x5”x1 3/8”
Weight:
10 oz
Country of Origin:
USA

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