XETEC Gravity MK2 5G-900 User manual

XETEC GRAVITY MK2 SERIES 5G-900
Congratulations for buying this XETEC product and thank you for your
confidence! With this XETEC amplifier you have purchased an innovative
and professional high-end product, which will enable you to enjoy your
music on a very high quality level for many years.Wehave especially focused
on electronic as well as product design to give you a product that will
accompany you for many years,as our products are always one step ahead
and will still be modern for many years.XETEC products represent the
experience our engineers have made through many years assisted by car
audio magazines as well as professional installers.
Please read these instructions very carefully,to avoid unnecessary trouble
and defects.In case of trouble,please contact your local dealer or check
our website www.xetec.de for troubleshooting. There we also offer up-to-
date hints and technical support for you.
The XETEC 5G-900 is a state-of-the-art 5-channel car audio amplifier,
especially developed for top quality speaker systems and subwoofers.
A perfect choice are the XETEC Component systems and subwoofers.
You can also run each 2 of the 4 satellite channels in bridged mode to gain
more than twice the output power,in order to drive midbasses or high
power component systems.
The versatility and many adjustment options makethe 5G-900 an allround
genius for car music reproduction.
PROPERTIES
• High efficiency Class D Digital subwoofer amplifier
• Four HPAA (High Precision Analog Amplifier) in satellite channels
• BLC (Bass Level Controller)
• Input Select (6-, 4- or 2-channel input modes)
• Independent low- and highpass filters (bandpass possible)
• Bridgeable satellite channels
• Optional carEQâmodule (car -specific parametric equalizer module)
(see chapter 5. „carEQâ”)
• Protection circuit: Overload, Short-circuit, DC, Overheat
SAFETY
• Before you make any connection, the battery must be
disconnected!
• A main fuse must be installed into the +12 V wire within the
first 12" from the + terminal of the battery (insurance
regulation!).
• Please note that a minimum speaker impedance of 2 Ohms
must be maintained. Do not connect speakers with lower
impedance in normal as well as in bridged mode!
• Make sure that you do not use defective speakers and
subwoofers. They can cause damage to your amplifier!
The fuses inside the amplifier only protects the device itself,not the battery
and the car!
IMPORTANT NOTICE: STABILITY OFAMPLIFIERS
Normal operation:
Every amplifier is only capable of driving loads (speakers) up to a certain
limit, which is set either by the protection circuits or the maximum power
output. XETEC amplifiers accept loads down to 2 Ohms in normal operation.
Bridged mode:
In bridged mode each two channels of the amplifier are driving the same
load, the acceptable impedance for each channel is also divided by two!
That means:
A normal amplifier „sees” 4 Ohms as 4 Ohms. In a bridged amplifier, each
amplifier „sees” 2 Ohms only!!!That´s why in bridged mode always 4 Ohms
must be maintained although the amplifier might be 2-Ohms stable.
CAUTION
This product is capable of conducting very high sound pressure
levels,and can thus be harmful to your health. Prolonged exposure
to high volume levels can cause hearing loss! Please use restraint
on the volume control. XETEC wants you to enjoy your amplifier
for a long time to come,and we do not takeresponsibility for
hearing loss nor other health problems.
1

0. INSTALLATION
For safety reasons,the amplifier has to be mounted properly and fixed to
the car body.Please fix the device using the screws that come with your
product. Be careful when drilling holes,there might be wires,fuel lines or
the gas tank behind a wall! Never drill holes when you do not know what´s
behind. Never install signal wires close to power cables to avoid hum and
alternator noise is being induced.
1. CONNECTIONS
Before you make any connections, always disconnect the battery!
1.1 First of all, connect the RCA cables coming from the radio/headunit
to the respective inputs of your amplifier. Always run signal cables in
a distance to power cables and the vehicle´s factory wires to avoid
induction of noise.
1.2 Now the speaker wires must be connected to the respective speaker
terminals. Please make sure to use speakers with the correct impedance!
Also make sure to connect all speakers with correct polarity to avoid
phase problems which can spoil the sound of the whole system.
1.3 Connect the BLC to the amplifier.
1.4 Next step is the ground connection.Check for a good grounding point
using your vehicle´s chassis.Makesure that this point has good
electrical contact! Some parts of the chassis might only be glued and
have no contact to battery (-). Run all ground cables of the system
to this point to avoid alternator whine and other noise.
1.5 As the next connection the +12 V cable has to be connected to the
(+) terminal of the battery.Always be careful not to run this cable
around sharp edges,the insulation might be damaged. For holes
always use grommets!
Always use an in-line fuse in the +12 V power cable in max. 12"
from the battery´s + terminal (value must meet the current
1.6 The last connection is the remote wire. The headunit must always be
turned off during this connection, as it might be damaged when
remote output is shorted to ground!
Now you can reconnect the battery and insert the main fuse into the power
cable fuse holder.
CAUTION: Both, the +12 V and the ground cable, must have
sufficient diameter!
XETEC proposes the following minimum gauges:
Total output power of the system:
Up to 100 W: 6 mm2Up to 1000 W: 35 mm2
Up to 250 W: 8 mm2Up to 1200 W: 40 mm2
Up to 500 W: 10 mm2More than1200 W: 50 mm2
Up to 750 W: 25 mm2
Weaker Cables will reduce the performance of your system significantly,
and may cause damage to your amplifiers. Weak cables also will heat-up!
CAUTION
Always replace fuses with same value. Higher values may cause damage
to your amplifier, battery or car!
2. FIRST POWER-ON
2.1 Adjust all level controls to minimum.
2.2 Turn on the radio at low volume.
2.3 Increase the volume and adjust the front speaker’s volume.
2.4 Now adjust the level ratio between front and rear speakers and
subwoofer (BLC).
XETEC recommends the following crossover frequencies:
16 cm front speaker: 16 cm rear speaker:
Highpass 80-100 Hz Highpass 100-120 Hz
13 cm front speaker 16 cm rear speaker:
Highpass 100-140 Hz Highpass 120-150 Hz
13 cm front speaker: 10 cm rear speaker:
Highpass 120-200 Hz Highpass 150-200 Hz
16 cm midbass: Bandpass 80/150 Hz (= Highpass 80 Hz + Lowpass 150 Hz),
Composystems then are run with Highpass 150-180 Hz!
Subwoofer: Lowpass 70-100 Hz, Subsonic 20-35 Hz
2
requirements of the whole sound system, minimum value is 60 A).

3. CONTROLS
4. CONNECTORS
1 RCA line inputs front (left and right channels)
2 RCA line inputs rear (left and right channels)
3 RCA subwoofer inputs (left and right channels)
4 Remote terminal
5 Input mode selector
6 BLC connector
7 Rear speakers connector
8 Front speakers connector
9 Subwoofer connector
1 +12 V and ground power input
2 Fuses (2x40 A)
3
Bal/unbal. selector switches:
All GRAVITY MK2 series amplifiers are equipped with selector switches for
balanced or unbalanced input mode operation, in order to prevent noise
induction by ground loops.
Alternator whine and other noise induction is mostly caused by improper
ground connections of the components like radio, equalizer, processor,
amplifier etc.
Unless all of them are grounded in one and the same grounding point on
the car chassis, noise may occur due to different ground potentials.
There is only one way to avoid these effects: Selection between balanced or
unbalanced input mode of the amplifiers.
Usage:
The amplifiers are factory-set to “balanced”. If noise occurs, all switches
should be set to „unbal.” For noise suppression, it is also allowed to set
a number of switches to “bal.”And others to „unbal.”, in order to find the
perfect combination.
All controls are accessible under the aluminium top cover.For adjustments,
remove the top cover using the hexa screwdriver that came with your
product.
1 Level front
2 Front highpass
3 Bypass for front highpass
4 Front lowpass
5 Bypass for front lowpass
6 Level rear
7 Rear Highpass
8 Bypass for rear highpass
9 Rear lowpass
10 Bypass for rear lowpass
11 Subsonic frequency
12 Subsonic on/off
13 Subwoofer lowpass frequency
14 Subwoofer phase shift 0°-180°
15 Parametric EQ Center frequency
16 Parametric EQ Q factor (bandwidth)
17 Parametric EQ Gain
18 Logo / Diagnostic LED: LED off: Amplifier is off; LED Blue: Amplifier
is ON, and working correctly.
LED RED: Protection activated.
See #6,
troubleshooting
REAR FRONT
++ + +
R L R L
FRONT REAR SUB
INPUTS
RR
LL REMOTE BLC
bridged bridged
SUB
INPUT MODE
SELECT
2ch
4ch
6ch
+
UNBAL UNBALUNBAL
BAL BALBAL 6
789
1
1
45
2
2
3
3
40A 40A
GRAVITY
5G-900 MK2
Digital / Analog Power Amplifier
+
12V
Engineered and designed in Germany
12
2
1
LOWPASS
FRONT
min max
LEVEL
REAR
On Off
min max
On Off
SUB
LOWPASSHIGHPASS
40
55
100
200
Hz
80 125
150
40
55
100
200
Hz
80 125
150
On Off
On Off
15
30
50
200
Hz
40 85
150
15
30
50
200
Hz
40 85
150
0180
Phase
40
50
85
160
Hz
70 100
125
0,5 20 -8 +8
dB
Q-Factor Gain
PARAMETRIC
EQUALIZER
33
110
60
45 80
20
180
Hz
GRAVITY
5G-900 MK2
5-Channel Amplifier
10
22
28
35
45
Hz
min max
SUBSONIC
LEVEL
124
35
678910
11 12 13 14
15 16 17
18
In case the noise problem still cannot be solved 100%, the ground wiring
must be revised and optimised.
10
10
10 Bal/unbal selktor switch

The carEQâmodule can be purchased as an accessory.A bypass module is
factory-installed and can be replaced by thecarEQâmodule. For installation
of the carEQâequalizer, the scale plate under the top cover has to be
removed. Before you open the amplifier to exchange the modules,
makesure that it is switched off! Damage will occur to your speakers
and amplifier, if the module is exchanged during operation!!!
The carEQâmodule contains up to10 independent equalizer bands for the
front and rear channels as an error correction for your specific car model.
Ask your local dealer for a list of car models or get it on our website
www.xetec.de
APPLIED TECHNOLOGIES
• HPAA © by XETEC design group GmbH: „High Precision Analogue
Amplifier”, symmetrical State-of-the-Art power amplifier
• X-SMPS © by XETEC design group GmbH: „x-Switched-Mode-Power-
Supply”, high efficiency power supply
• VCVS-Filter © by XETEC design group GmbH: „Voltage Controlled
Voltage Source”, filters for the crossover networks
• X-protect © by XETEC design group GmbH: Highly sensitive protection
circuits
• carEQ © by XETEC design group GmbH: Car-acoustical error correction
circuit (for specific car model)
4
5. carEQâ(optional accessory)
For XETEC Gravity series models 4G-300, 4G-600 and 5G-900 the optional
carEQâequalizer module is available as an accessory
.ThecarEQâequalizer
is engineered to optimise your sound system by compensating for the
vehicle´sacousticalproblems.Every car model has it´s characteristicacoustical
problems, caused by resonances, reflections and peaks generated by the
shape of the interior, regardless which kind of speakers are used.
These individual curves have been recorded by XETEC engineers and
programmed into the carEQâmodule, which exactly reverses these errors
for compensation. The result is an enhanced sound quality without the
vehicle´s acoustical errors.
Actually not even the best loudspeakers can reproduce music in a car as
it is, since the acoustical errors are always added.
TECHNICAL DATA
XETEC 5G-900 MK2
RMS Output power @ 4 Ohms: 4x100 W
RMS Output power @ 4 Ohms: 2x200 W in bridged mode
RMS Output power @ 2 Ohms: 4x130 W
Peak output power: 1200 W total
Max input Current (@ 13,8 V): 85 A
Idle current (no signal): 1,4 A
Max Current (@ 13,8 V): 100 A
Fuse: 2x40 A
Total Harmonic Distortion (THD): <0,02%
SNR: >92 dB(A)
Freq. Response (bypass mode): 5 Hz-30.000 Hz (in bypass mode)
Damping Factor: >200 (50 Hz)
Stability: >2 Ohm, (>4 Ohm in bridged mode!)
Input Sensitivity: 250 mV-6 V
Crossover frequencies: 40-200 Hz lowpass, 15-200 Hz
highpass, 10-50 Hz subsonic
Ground lift (balanced / unbalanced)
Subwoofer gain adjust with Bass level controller
Warranty: 1 year (2 years in EU)

TROUBLESHOOTING
1. Power indicator LED in top plate is not lit
• Main fuse or fuse in amplifier blown?
• Remote wire properly connected?
Is there remote voltage (12 V)?
• Amplifier overheated?
2. Power indicator LED in top plate lights RED
• Protection active. Check the speakers and
speaker wires for short-circuit!
• Battery voltage low (<10,2 V)?
• DC on one of the speaker outputs?
• Overload.
3. Distortions at medium level
• Please check the speaker connections
for short-circuits.
• Are the speakers OK?
• Radio volume turned up too high.
Better turn up the amplifier’s level controls.
4. Alternator whine and similar noise
• Bad ground connections?
• Use ONE ground contact only!
• RCA cables run too close to power cables?
In case of further trouble, please ask your local XETEC dealer for support.
5
XETEC design group GmbH
Lengerichen Landstrasse 30
D-49078 Osnabrück
Phone [phone]
E-mail:[email protected]
6.