Ground Zero GZDSP 4.60ISO Service Manual

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DSP-SERIES

AMPLIFIER

MANUAL

GZDSP 4.60ISO

• 4-channel ISO Plug & Play amplifier with integrated signal processor (DSP)

• For vehicles with ISO connectors (without active OEM sound system)

• 4-channel high-level input (via ISO harness with auto-on function)

• 4-channel line output (RCA)

• AUX input (RCA)

• TOSLINK input (sampling rate up to 24-bit/96kHz)

• Plug for optional wireless interface (for music streaming)

• 8-channel signal processor (DSP) - Cirrus Logic single core 32-bit/192 kHz

• Realtime setup of all functions (via PC)

• Simple handling one-page graphical user interface (Windows compatible)

• Channel separated parametric equalizer (6x 31 band / 2x 11band)

• Channel separated time alignment (0-15 ms / 0-510 cm)

• Adjustable crossover (HPF / LPF / BPF) in the range of 20 Hz to 20 kHz

• Selectable crossover slope (6 to 48 dB/Oct)

• Selectable phase shift for each channel (0˚ or 180°)

• Memory for 10 user presets (selectable with optional remote control)

• Two optional remote control available (one with LED display or one with LCD color display

with touch screen to adjust main and subwoofer level, select one of the presets and the input mode

• Power and status indicator (protection circuit)

• High temperature / short circuit / overload protection circuit)

Feature list

- 2 -

- 3 -

Important safety notes and installation instructions

Audio connections

ISO harness connection

Note about the vehicle´s ISO plug pinout

Note about the current requirement

PC software installation

Connecting the unit with a Windows PC

8-9

USB port selection

Wrong COM port error message

Software user interface

Channel selection

Channel configuration (level adjustment and time alignment)

Application example (time alignment)

Adjustment of the crossover

Frequency chart and equalizer

File dropdown menu

Preset memory saving and loading

Remote setting / Application examples of the GZDSP 4.60ISO

Technical specifications

Error diagnosis

Warranty conditions

Package contents

• 1 x GZDSP 4.60ISO amplifier

• 1 x Universal ISO harness

• 1 x USB cable (A- to Mini-B connector) 1.5 m / 4.92 ft

• 1 x 4-channel line output harness

• 1 x AUX input harness (incl. remote connection)

• 1 x CD-ROM incl. PC software and driver package (for Windows)

• Owner´s manual (German and English)

Optionally available:

• Remote control unit

• Interface

GZDSP BT-Box with connecting cable (for wireless music streaming)

GZDSP Remote with LED display incl. connection wire GZDSP Touch-Remote with color LCD display incl. connection wire

Table of contents

Channel matrix 13

- 4 -

WARNING!

• screwdriver

• electric drill, 3 mm / 0.12“ carbide drill bit

• mounting screws

• Disconnect the vehicle battery before starting the installation! (Note the vehicles operating manual)

• Never drill any holes into the fuel tank, brake pipes, wiring or any other sensitive parts of the vehicle!

• Keep the installed wires away from any sharp edges!

Required parts and tools for the installation

IMPORTANT!

High powered audio systems in a vehicle are capable of generating "Live Concert" levels of sound pressure.

Continued exposure to excessively high volume sound levels may cause hearing loss or damage. Also, operation of a

motor vehicle while listening to audio equipment at high volume levels may impair your ability to hear external sounds such as horns, warning signals or emergency vehicles! This may lead to potential traffic hazards. In the

interest of safety, consumer electronics recommends listening at lower volume levels while driving.

Select a suitable location that is convenient for mounting, is accessible for wiring and has an ample room for air circulation and cooling.

The unit must not be covered or mounted close to heat emitting objects. Because of the high operation temperature (up to 80°C), it is

important to ensure sufficient distance to any heat-sensitive object . Especially the distance between GZDSP 4.60ISO and any plastic part or

electronic component should be at least 3 cm (1.18”).

You may use the unit as a template to mark the mounting holes, then remove it and drill the marked holes. Finally mount the unit with the

mounting screws.

Choose a mounting position where all electric wires are protected from being damaged by sharp edges, heat or other conditions. +12 Volt

DC electrical connections must be fused on the battery side. Make sure your head-unit and all other devices wil l remain turned off while

connecting parts of the system. If it is necessary to replace any fuse make sure to use only an equivalent one. Using inferior fuses may cause

serious damage to your unit, wiring or even your cars electric. Any kind of damage traced back on disregard of these notes will not be

covered by the warranty!

Selecting a mounting position

Mounting the Unit

Caution

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LINE OUT socket

To connect the included 4-channel RCA line out harness delivering the audio signal of channel E/F 2

MAIN INPUT socket

To connect the included ISO harness for power and high-level input as well as speaker output

POW & PRT stat us indicator

The amplifier is in operation mode as soon as the POW indicator turns on. When the amplifiers 4

REMOTE socket

To connect one of the optionally available remo te-control units GZDSP Remote

GZDSP Touch-Remote

OPTICAL INPUT socket (TOSLINK)

To connect a digital audio source using the optical signal (SPDIF / stereo PCM) Attention: If the digital audio source has no level control, we strongly recommend using one of the available remote-control units. Otherwise the audio reproduction will be app lied at max level!

PC CONNECT (MINI USB socket) and status indica tor

To adjust the audio setting the unit must be connected to a PC using the included USB cable

AUTO TURN ON switch

Selects the turn-on mode. When ON has been selected the amplifier will turn on automatically as

BT BOX socket

To connect the wireless audio interface GZDSP BT-Box or remote control GZDSP Touch-Remote –

AUX INPUT socket (REM IN/OUT)

To connect the 2-channel RCA AUX harness for an additional audio source.AUX can be se lected as

auto-on

130 mA

Audio connections

and G/H for further amplifiers. The signal can be set using the PC software

protection circuit is activated the PRT indicator turns on (see chapter Error diagnosis)

(compatible Windows PC with installed DSP software from the CD). The PC can be disconnected when the adjustment is done. The USB cable should not be extended to ensure an accurate communication between the DSP unit and the PC. The indicator next to the MINI USB socket will turn blue as soon as the connection has been established.

soon as an audio signal is detected at the high-level input. In OFF position , the amplifier has to be turned on using a separate remote wire (v ia AUX harness).

both of them are available optionally.

audio source using the PC software or one of the available remote-control units. If the input is limited to the AUX input, the remote wire has to be connected to the AUX harness (remote in). The remote out wire can be used to turn on further amplifiers when the DSP unit is in operation. A wire diameter of at least 0.5 mm² is required. The current of the remote out wire is limited to with a common current exceeding the limitation, an additional relay is required.

switch must be in OFF position and a separate

. In case of using several units

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ATTENTION!

ISO harness connection

The GZDSP 4.60ISO will be connected directly to the wiring of the factory or after market head unit (power and speaker cables) by integrating the included ISO harness as shown below. Cars with other than ISO connectors (e.g. Quadlock) require an optional adapter available at your car audio dealer.

Please note that the GZDSP 4.60ISO cannot be used in vehicles with a factory active system installed. That might lead

to serious defects of the amplifier as well as of the vehicle´s electronic system. In case of uncertainty contact your car

audio dealer or the car´s manufacturer.

Note about the vehicle´s ISO plug pinout

Please note, that the pinout of the car specific ISO plug may vary in some cases. Amongst some others the cars of the

VAG group (VW, Audi, Seat, Skoda) the pins for constant and accessory power are inverted. This has to be noticed

previous to the installation of the GZDSP 4.60ISO. For this reason, the according wires (blue and yellow) can be

repositioned at the ISO harness (see above / chapter ISO harness connection).

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ATTENTION

Note about the current requirement

The GZDSP 4.60ISO amplifier has been developed to be installed using the factory wiring. For some vehicles however,

it might be necessary to connect the power wires of the GZDSP 4.60ISO directly to the car´s battery and the ground

wire to the car´s body.

- The factory´s wiring of the head unit should have a fuse with a value of at least 20A. Otherwise the power supply might be insufficient for an accurate operation of the amplifier. (see fuses / car´s owner´s manual)

- If there are further aftermarket units like a handsfree, GPS system, charging cable or similar consumers connected to the head unit´s factory wiring, the current might exceed the fuse value.

- It is not possible to install more than one GZDSP 4.60ISO using the factory´s head unit wiring. If further amplifiers are to be installed, the power wire has to be connected directly the battery and ground wire directly to the car´s body.

- For the best result, it is recommended to connect the power wire of the GZDSP 4.60ISO directly to the battery and the ground wire to the car´s body. For this, the cable connectors of the harness have to be dispatched and connected to separate wires (not included). Please, contact your car audio installer if necessary.

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In order to install and use the PC software, a Windows™ XP (SP3) operating system (or later) with a USB port is required. The installation will need about 25 MB free memory space. We recommend using a laptop for easier handling. Insert the enclosed CD-ROM into the CD drive of your PC. If there is no CD drive available, the software can be downloaded from the following link: www.ground-zero-audio.com

Run the setup.exe file. The installation wizard will install the software for the DSP as usual. We recommend creating a desktop icon. The drivers will be installed automatically during the DSP software installation. The PC requires a restart after the installation of the software

Important note for 64 bit operating systems: It might be necessary to install the 64 bit driver manually. The driver can be found on the CD-ROM or:

www.ground-zero-audio.com

Software update: It´s strongly recommended running always the latest DSP software. The actual version can be downloaded here:

www.ground-zero-audio.com

Connecting the DSP to the PC

PC software installation

Note about the USB connection:

The included USB cable should not be extended to avoid any kind of malfunction of the communication between the

DSP unit and the PC. The LED next to the USB port on the unit will light up blue as soon as the GZDSP 4.60ISO has

established a connection to the PC.

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In order to configure the DSP,

Select Device

RS232 Setting

Note:

Connect

Click here to test

[OK] Click here to start

the GZDSP 4.60ISO has to be connected to the PC with the DSP software installed using the included USB wire. The head unit and the DSP unit have to be turned on before running the DSP software on the PC. The DSP software starts by double click on the desktop icon. The start screen will appear and the GZDSP 4.60ISO should be selected as device (Select Device).

The latest software version can be downloaded from this page:

www.ground-zero-audio.com

Demo Mode (Off-Line Mode): It´s possible to use the software in offline mode without having the GZDSP 4.60ISO connected to the PC to become familiar with most of the features and to create sample setups.

USB port selection

After having the DSP unit selected at the the

Usually the correct COM port will be selected automatically. The port number

window will appear.

may vary depending on the computer´s environment. It can be selected manually using the drop down menu.

The COM port will be assigned automatically by the Windows operating system. Please note that this should be one of the ports COM1 to COM9. In case of any problem, please follow the instructions on the next page.

A click on the

button will start the automatic connection process of

the GZDSP 4.60ISO to the PC.

Next click on

A number of automatic tests will be initiated now and each of them marked as

after successful examination.

Finally, a click on

connects the unit to the PC.

will open the user interface of the

DSP software.

menu,

- 10 -

If this message will appear, the operating system

In this case the correct COM port is number 3

Important note:

USB-SERIAL CH340

properties

USB-SERIAL CH340

Wrong COM-Port error message

assigned the wrong COM port or it was not possible to assign one of the COM1 to COM9 ports due to environmental issues of the PC. The COM port assignment may be checked with the operating system´s device manager.

Close the pop-up window by clicking possible to select the correct COM port at the Select COM window.

If the assigned COM port will be COM10 or even higher one of the unused COM ports 1 to 9 has to be deleted in order to change the previously automatically assigned COM port for the

Subsequently, the COM port can be selected in the

of the

on the device at the device manager).

. Now it is

device.

device (right click

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1 2 3 4 5 6 7 8 9

Input selection

MAIN AUX SPDIF

Gain

speakers.

SOURCE

Software user interface

- high-level audio input (via ISO harness)

- RCA input (via AUX harness)

- optical input (TOSLINK socket)

Main volume control

- Main volume (-40dB to +12dB).

Caution: The controls have to be used carefully to avoid damaging the

- 12 -

Channel selection

Clicking the -Icon will invert the left and right inputs.

Warning

CH SETTING

Trying to synchronize (link) two channels, which have already been adjusted separately, will cause a pop-up warning.

Confirming this with OK will reset all channel wise done previous adjustments. This cannot be revoke. Therefore, either a separate adjustment is recommended or alternatively the copyfunctions

or can be used.

Clicking the

-Icon will link the relevant pair of channels allowing function

adjustments simultaneously (Crossover / Slope / Equalizer) for both channels.

Simultaneous adjustment of channel A and B

Independent adjustment of channel A and B

Clicking

will copy the current adjustment of the left channel to the right channel.

will copy the current adjustment of the right channel to the left channel.

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Configuration of in- and outputs

Input

Output

Speaker Type Input-MIX –

CHANNEL MATRIX

This setup should be chosen if the head unit has filtered (HPF/LPF/BPF) speaker output channels. All 4 high level input channels will be summed to a full-range audio signal.

Outputs A+C+E+G receive a summed audio signal from the input channels FL+RL Outputs B+D+F+H receive a summed audio signal from the inpu t channels FR+RR

We recommend connecting the input channels as follows Front left and Front right: Highpass filtered audio signal Rear left and Rear right: Bandpass filtered audio signal

Input summing of filtered signals

– Assignment of the corresponding input channel to the respective output A – H. The following input options are available:

Channel A/B : F-L ( Channel C/D/E/F : F-L (

Channel G/H: F-L (

or F-L+R (

Front-L) and F-R (Front-R) Front-L) and F-R (Front-R)

or R-L (

Rear-L) and R-R (Rear-R)

Front-L) and F-R (Front-R)

or R-L (

Rear-L) and R-R (Rear-R)

or R-L+R ( or F+R-L ( or F+R-R (sum of Front-R and Rear-R)

sum of Front-L and Front-R) sum of Rear-L and Rear-R)

sum of Front-L and Rear-L)

The following options will be displayed and might be selected as well. However, these cannot be used with the GZDSP 4.60ISO amplifier.

SUB-L and SUB-R

SUB-L+R (

sum of SUB-L and SUB-R)

: Clicking the corresponding channel will allow adjustments of crossover, slope and equalizer functions. Same as CH Setting (2) function.

The mentioned information to channel A, B, C and D refer to the speaker output of the GZDSP 4.60ISO. The signal of channel E, F, G and H will be available at the RCA line output (via line out harness).

: Pre-selection of the connected speakers.

3 different options can be chosen.

OFF – Channel deactivated Fullrange – All filters deactivated! (individually selectable) Tweeter (A/B) – Highpass filter preset 3000 Hz (12 dB/oct) Midrange Kickwoofer Subwoofer

(C/D) – Bandpass filter preset 250 / 3000 Hz (12 dB/oct)

(E/F) – Bandpass filter preset 80 / 250 Hz (12 dB/oct)

(G/H) – Bandpass filter preset 20 / 80 Hz (12 dB/oct)

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Channel configuration (level adjustments and time alignment)

Select:

Select

Gain

Delay

Gain:

Delay(ms)

Warning:

(5)

Delay(ms)

Phase

Delay(ms)

GAIN & DELAY

Marking the channel as channels together for combined adjustments of

To adjust the output level of the respective channel

: To adjust the time alignment of the respective channel. Will be displayed in milliseconds.

It is recommended to fill in the measured distances of the speakers to the listening position first fine-tuning later at the

– 0 / 180° Phase inversion of the respective channel

– Mutes the respective channel

SPEAKER DISTANCE

Speaker distance entry

Before realizing the fine-tuning of each speaker´s time alignment in window 4 all connected speakers should be added to the graphic.

The exact distance between listening position (head) and cone center of each speaker must be measured.

The explanation of a correct implementation on the following page can be used as an application example.

ed allows grouping the respective

and

and realize detailed

, the measured distances of

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Application example (time alignment)

Delay(ms)

All measured distances (cm) must be added to the graphic.

Clicking the button will cause the calculation of the respective time alignment and transfer the data to the

Further adjustments can be edited to either the time alignment list or to the distance window.

The Reset button will delete all settings of the time alignment. Other DSP settings remain.

list.

- 16 -

Adjustment of the crossover

Important:

Speaker Type

Fullrange

Slope

Note:

Adjusting the cutoff frequency

Note

Hint:

SLOPE

CROSSOVER

Before choosing the filter, a

must be defined in window 3.

When the setup consists of a front system connected to channel A/B and a rear speaker system connected to channel C/D, the

entry should be selected. According to the speakers and listeners request a high pass filter (HP) can be activated at the

window.

High pass (

) / Bandpass (BP) and low pass (LP) can be chosen at the

window for the selected channel(s).

A slope of 6 to 48 dB/oct can be selected at the drop down menu.

The higher the selected value the steeper the slope starting at the crossover frequency.

The filters can be adjusted continuously from 20 – 20000 Hz.

The controls can only be used if a filter (Slope/6) has been selected

first.

: If a filter has been selected, it is possible to adjust the crossover frequency directly with the cursor at the frequency chart (8). Click and hold the red (HPF) or blue (LPF) dot with the cursor and move it to the desired point on the frequency chart.

Instead of using the crossover control, it is possible to adjust the crossover point by typing the required value directly into the box above and confirm with >ENTER< or by using the up/down cursor buttons.

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Function of the frequency diagram

Adjusting the parametric 31-band equalizer

FREQUENCY DIAGRAM

The frequency chart displays the adjustments of the 31 band equalizer (9) and the setting of the crossover (7) for every output channel or a pair of output channels.

Furthermore the curves can be adjusted individually using the mouse (drag&drop).

EQUALIZER

The output channels A to F can be equalized by adjusting 31 frequency bands (20 - 20000 Hz) using the controls (-18 to +12dB) individually. The subwoofer output channels G/H offer 11 bands (20 - 200 Hz) to adjust the audio signal. Each frequency can be adjusted individually in 1-Hz steps in the F(Hz) window. Additionally, it is possible to change the filter Q (bandwidth/slope) by typing the required value directly into the box below each band control (0,5/narrow - 9,0/wide) or by using the up/down cursor buttons.

Furthermore, the curves can be adjusted individually in window 8 using the mouse (drag&drop).

The EQ-function can be deactivated with the

Using the not affected).

button will cause a full reset of the EQ-setup to factory setting. (Other adjustments are

button without resetting the EQ-setup.

- 18 -

PC Contrl

Opens the „Select COM“ window (page 9)

Open

Opens a setup file that has been saved previously to the PC memory or an external drive

Save

Saves the current setup as a file to the PC with unmodified filename. If no filename has been selected yet, the dialogue will ask for the input.

Save as

Saves a setup file with a certain filename.

Factory setting

Sets the unit to default settings

Class-D AMP Setting

No function

Write to Device*

Saves the current setting to the preset memory of the GZDSP 4.60ISO unit. At the following window, the preset number can be selected.

Read from Device*

Opens one of the available presets from the memory of the

window. The blue frame indicates the actually selected preset number.

Exit

Closes the DSP software

Select Save Place

Save

Select Read Place

Read

*Important: The 10 presets can be used if the optional remote control GZDSP Remote or GZDSP Touch-Remote is connected. Without the remote-control unit, it is only possible to use and edit the last preset that has been saved.

*Note: All presets must be covered in numerical order (Pos 1>Pos 2>Pos 3>…) without skipping a position, otherwise it will not be possible to access all presets with the remote control.

Preset memory saving and loading

FILE dropdown menu

GZDSP 4.60ISO. The preset can be selected from the following

Open the dropdown menu at

preset positions. Confirm by clicking

and choose one of the

- 19 -

Remote setting / Subwoofer channel selection

Front and rear speaker system + subwoofer (e.g. active sub)

2-way front system (active) + + subwoofer (e.g. active sub)

Channel

A/B

Front system at speaker output

HP: 50 – 80 Hz

Tweeter at speaker output

HP: 2500 – 4500 Hz

C/D

Midwoofer at speaker output

LP: 2500 – 4500 Hz

E /F - -

G/H

Subwoofer

LP: 50 – 80 Hz

Subwoofer

LP: 50 – 80 Hz

One pair of channels can

be selected as subwoofer output. These two channels are effected using the subwoofer level control of the optional remote control unit.

The dropdown menu offers the choice of four pairs of channels to select from.

The setting is finished by clicking confirmation.

Application examples

GZDSP 4.60ISO offers various system configurations. Here is a description of the two most common applications:

Note: The final crossover points depend on the speaker´s capacity that have been installed. The technical specifications of the speakers will supply more information about possible applications and suggested crossover points. Above, these are just noncommittal examples. Ground Zero will not be legally responsible for any kind of damage of speakers or other components caused by wrong settings.

High pass filter

Rear system at speaker output High pass filter HP: 50 – 120 Hz

Bandpass filter HP: 10 – 30 Hz

High pass filter

Bandpass filter HP: 50 – 80 Hz

Bandpass filter HP: 10 – 30 Hz

- 20 -

Technical Specifications

Model

GZDSP 4.60ISO

Type

Frequency range

20 Hz – 20 KHz

RMS Power @ 4 Ω

CEA Standard CEA-2006-A

RMS Power @ 2 Ω

CEA Standard CEA-2006-A

Max. Power @ 2 Ω

CEA Standard CEA-2006-A

Processor

Sensitivity

Input resistance

Output

4 x high level output (via ISO harness)

4 x line output ( RCA)

Input

4 x high level input (via ISO harness)

Digital input: TOSLINK optical max. 24bit/96 kHz (PCM stereo)

Remote out

Recommended fuse

Dimensions Heatsink only W x H x L

Dimensions Whole unit W x H x L

Software compatibility

Preset

Gain range

Equalizer

Tiome alignment

Crossover

Phase shift

Optionally available Remote control units

4-channel amplifier with integrated DSP and ISO connection

(-3 dB)

4 x 40 W (1% THD+N)

4 x 50 W (1% THD+N)

4 x 60 W (10% THD+N)

Cirrus Logic single core 32 bit, 8-channel, 192 kHz

High level input: 2 – 15 V RMS

AUX input (RCA): 0.6 – 5 V RMS

>47 kΩ (low level input)

AUX: 2 x RCA input (via AUX harness)

max. 130mA

20 A

185 x 39 x 96 mm

7.28“ x 1.54“x 3.78“

185 x 42 x 132 mm

7.28“ x 1.65“ x 5.20“

Microsoft Windows™ XP SP3, Vista, 7, 8, 8.1,10

10 x individually adjustable / selectable using the optionally available

remote control unit GZDSP Remote or GZDSP Touch-Remote

-40 to +12dB

6 x 31 bands at output A - F (20 – 20000Hz), -18 bis +12dB, Q 0.5 - 9

2 x 11 bands at output G&H (20 – 200Hz), -18 bis +12dB, Q 0.5 - 9

0 – 15 ms / 0 – 502 cm per channel

6 / 12 / 18 / 24 / 30 / 36 / 42 / 48 dB/oct (BPF / LPF / HPF Butterworth)

(main level, subwoofer level, source selection and preset selection)

GZDSP Remote or GZDSP Touch-Remote

20 – 20000 Hz

0° / 180° per channel

- 21 -

Error

Control

Help / Solution

check the fusing

check the ground connection and wire

no setup selected

select the setup using the DSP software

signal wire no contact or broken

check the contact or replace the wire

no audio signal from the head-unit

check the audio output signal of the head-unit

check the remote OUT wire if used check the further amplifier´s power supply

non operational source selected

check the selected source

MUTE function activated (software)

check the setting in the software

adjusted level on optiona l remote control is too low

signal wire no contact or broken

check the contact or replace the wire

no audio signal from the head-unit

check the audio output signal of the head-unit

balance or fader control of the head-unit not in center pos ition

wrong setup of input and output mode

check the setting

GAIN level too low or Mute function (software) activated

check the polarity of the speaker connection

check the TIME ALIGNMENT adjustment

reduce the volume level check the high pass filter and slope

select the corr ect input mode pay attention to the input sensitivity of the unit

reduce the volume level of the head-unit

deactivate the Loudness function of the head-unit

max output power of the GZDSP 4.60ISO exceeded. GAIN level is too high

reduce the GAIN level (software)

select a superior quality head-unit

the head unit, GZDSP 4.60ISO and each further amplifier should

connections

signal wire no contact or broken

check the contact or replace the wire

defective head unit

let the audio store or manufacturer check the head-unit

defective amplifier

let the audio store or manufacturer check the amplifier

GZDSP 4.60ISO or futher amplifier mounted close to an automotive control unit

analog output of an OEM MOST head-unit connected

Error diagnosis

No function PWR LED on?

No sound

(PWR LED on)

Single channels

with no function

Impure sound,

incorrect stereo

reproduction

Distorted sound

quality

Increased

noise level

Car specific

interferences

audible through

the audio system

non-operational further amplifier

inverted phase of one or more speakers

speaker overload

DSP input override (distortion)

head-unit output override (distort ion)

amplifier override (clipping)

head-unit creates noise

diverse power supplies or ground connection

check the remote wire (AUX mode only) check the +12 Volt connection and wire

check the setting at the remote control

check the setting of the head-un it

check the setting

check the polarity of the high-level input check the PHASE setting

set the sound controls of the head uni t to center position

reduce the level to avoid damage to the amplifier or speakers

use the optical output (if a vailable) let the audio store or manufacturer check the head-unit

be wired up to a common ground as well as +12 Volt

choose another mounting position

connect the digital MOST audio signal to the digital input*

*Note: Use an optional car specific interface to connect the digital MOST audio signal directly to the digital input of the GZDSP 4.60ISO

- 22 -

Terms of warranty

The limited warranty for this product is covered by Ground Zero´s local distribution partners and their

terms and conditions. For further information contact your local retailer or distributor.

Ground Zero GmbH

Erlenweg 25, 85658 Egmating, Germany

Tel. +49 (0)8095/873 830 Fax -8310

www.ground-zero-audio.com

Ground Zero GZDSP 4.60ISO Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual