Ground Zero GZDSP 4.80AMP Service Manual

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DSP-SERIES

AMPLIFIER

MANUAL

GZDSP 4.80AMP

• 4-channel amplifier with integrated 8-channel signal processor (DSP)

• High efficient 2 Ohm stable class D amplifier

• 6-channel line input (RCA)

• 6-channel high-level input (with auto-on function)

• AUX input (3.5 mm socket)

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

• Plug for optional interface (wireless music streaming)

• 4-channel line output (RCA)

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

• Realtime setup of DSP 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 - 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 units available (GZDSP Remote or GZDSP Touch-Remote)

to adjust main and subwoofer level, select the presets and input mode

• LED power and status indicator (protection circuit)

• Power on delay

• High temperature / short circuit / overload protection circuit)

Feature list

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Important safety notes and installation instructions

Audio connections (input)

Audio connections (output)

High-level input harness

PC software installation

Connecting the unit with a Windows PC

USB port selection

Wrong COM port error message

Software user interface

Channel selection

Channel matrix

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

Technical specifications

Error diagnosis

Warranty conditions

Package contents

• 1 x GZDSP 4.80AMP amplifier

• 1 x USB cable (A- to Mini-B connector) 5 m

• 1 x 4-channel line output harness

• 1 x 6-channel high-level input harness

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

• 1 x Owner´s manual (German and English)

• 1 x Fastening Kit

Optionally available:

• Remote-control unit

• Interface

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

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

Table of content

Application examples of the GZDSP 4.80AMP 17

- 3 -

GZDSP 4.80AMP

Speaker wires

min 1.5 mm² / 15 AWG

Power supply wir es

min 20.0 mm² / 4 AWG

High-level input wires

min 1.00 mm² / 18 AW

Remote Leitung

min 0.50 mm² / 20 AW

WARNING!

• As a precaution, it is recommended to disconnect the vehic les battery before mounting (also note the vehicles manual!)

• The power supply wire (+12 V) has to be protected within max. 20 cm / 8” by a main fuse holder with matching fuse value

(Main fuse value has to be equal to the sum of values of the fuses of each connected device)

• If necessary, replace a defective fuse with the identical value only

• Never drill a hole to the vehicles gas tank or brake lines, to wirings or any other important vehicle part!

• Never pass wires over sharp edges or vehicle parts

• Keep the wiring away from the antenna and electronic devices contr ibuting to radio reception

• Lay the power supply wiring always separated from speaker wiring

• The amplifier contains a temperature protection circuit that turns the device off in case of overheating. After a coo ling time,

it will turn on again automatically. To avoid heat buildup, sufficient air supply for cooling must be provided. Never cover the surface of the heatsink entirely.

• The amplifier should not be mounted on a heavily vibrating part or surface (e.g. subwoofer enclosure)

• If a pre-amplified output (RCA) is ava ilable (at the head unit), it is recommended to use it for input wiring

• screwdriver

• electric drill - 3 mm / 0.12“ car bide drill b it

• recommende power wiring

Required parts and tools for the installation

Recommended wiring

Mounting instructions

to excessively high-volume sound levels may cause hearing loss or damage. Also, operation of a motor vehicle while

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 4.80AMP 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 will remain turned off while

connecting parts of the system. If it is necessary to replace the fuse(s), 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!

High powered audio systems in a vehicle can generate "Live Concert" levels of sound pressure. Continued exposure

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.

Selecting a mounting position

Mounting the Unit

Caution

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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 applied at max level!

REMOTE CONTROL

socket

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

GZDSP Touch-Remote

Line Input SUB

Connect the subwoofer line out of the head-unit (if available)

Line Input REAR

Connect the rear line output of the head-unit (if available)

Line Input FRONT

Connect the front line output of the head-unit (if available)

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

LINE OUT

To connect the included 4-channel RCA line out harness delivering the audio signal of channel

HIGH LEVEL INPUT

The High-Level Input must be used if there´s no pre-amplified output at the head-unit, nor offering

Caution: The high-level input and the line input(s) cannot be used simultaneously. This may lead to malfunction and cause serious damage to the DSP unit.

AUX INPUT

The 3.5 mm socket can be connected to an additional source unit. AUX can be selected as audio 10

PC Link switch

To establish a wired connection to the PC, the switch must be in „USB” position. The “BT” position is without function.

BT BOX socket

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

Audio connections (input)

(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.

E/F and G/H for further amplifiers. The signal can be set using the PC soft ware.

a SP/DIF signal. In this case the head-unit speaker output wires must be connected to the highlevel input harness. By using the high-level input, the DSP unit will turn on automatically recognizing the DC level. It´s not necessary to connect the Remote-In wire to the power terminal.

source using the PC software or one of the available remote-control units.

– both are available optionally.

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POWER INPUT

+12V Positive termin al (battery)

Never connect the remote output wire of a source unit in high-level mode to the remote terminal!

130 mA

with a common current exceeding the limitation, an additional relay is required.

FUSE

Defective fuses must be replaced by fuses with identical values

Status indicator

POWER

green/ok (regular operation mode)

PROTECT red/error (protection mode)

SPEAKER OUTPUT

Channel A/B/C/D speaker terminal

ATTENTION!

GND Ground terminal REM Remote input (in RCA mode)

In high-level mode, the switched voltage at the terminal can be used to turn on additional amplifiers. The current of the remote terminal is l imited to

High-level input harness

Please note that the GZDSP 4.80AMP 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

Power input & speaker output connections

audio dealer or the car´s manufacturer.

Remote output (in high-level mode)

. In case of using several units

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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

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 4.80AMP has

established a connection to the PC.

Installing the PC software

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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 4.80AMP must be connected to a PC with the DSP software installed using the included USB wire. The head unit and the DSP unit must be turned on before opening the software. The DSP software starts by double-click the desktop icon. The start screen appears and GZDSP 4.80AMP should be selected as device (Select Device).

The latest software version can be downloaded from this page:

www.ground-zero-audio.com

Demo Mode (Offline Mode): It´s possible to use the software in offline mode without having the GZDSP 4.80AMP 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 dropdown 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 4.80AMP 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,

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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

Main volume control

Gain

Caution:

SOURCE

Software user interface

- RCA line or high-level input

- 3.5 mm input socket

- Optical input (TOSLINK socket)

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

The controls must be used carefully to avoid damaging the speakers.

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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 6 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 input 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)

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 4.80AMP. 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

Speaker distance entry

(Gain & Delay)

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

– Mute of the respective channel

SPEAKER DISTANCE

Before realizing the detailed tuning of each speaker´s time alignment connected speakers should be added to this graphic.

The exact distance between listening position (head) and the 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 all

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Application example (time alignment)

Delay

alignment function. Other DSP settings remain

All measured distances (cm) must be added to the according fields of the graphic

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

Further detailed adjustments can be edited to either the time alignment list (ms) or to the speaker distance window (cm)

The Reset button will delete all settings of the time

list

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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.

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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 4.80AMP 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 4.80AMP. The preset can be selected from the following

Open the dropdown menu at

preset positions. Confirm by clicking

and choose one of the

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Application examples

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

GZDSP 4.80AMP offers various system configurations. Here is a description of the two most common applications:

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

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.

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Technical Specifications

Model

GZDSP 4.80AMP

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

Processor

Sensitivity

Input resitsance

Output

4-channel line output (RCA)

Input

6-channel high level input

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

GZDSP Remote

GZDSP Touch-Remote

4-channel amplifier with integrated signal processor (DSP)

(-3 dB)

4 x 80 W (1% THD+N)

4 x 130 W (1% THD+N)

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

High level input: 2 – 15 V RMS

AUX input: 0.6 – 5 V RMS

>47 kΩ (low level input)

4-channel speaker output

AUX (3.5 mm socket)

max. 130mA

2 x 30 A

185 x 39 x 181 mm

7.28“ x 1.54“x 7.13“

185 x 42 x 215 mm

7.28“ x 1.77“x 8.46“

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

10 x individually adjustable / selectable using the optionally ava ilable

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)

20 – 20000 Hz

0° / 180° per channel

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Error

Control

Help / Solution

check the fuse(s)

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 wire connection (if used) check the further amplifier´s po wer supply

non-operational source is selected

check the source unit

MUTE function activated (software)

check the setup using the DSP software

level at optional remote control is too low

check the setting at the remote control

signal wire has no contact or it´s broken

check the contacts 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 is not in the center position

wrong setup of input and output mode

check the setup using the DSP software

gain (level) is too low, or the MUTE function is activated in the DSP setup

check the polarity of the speaker connection

check the TIME ALIGNMENT adjustment

reduce the volume leve l check the high-pass filter and the slope of the filter

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 4.80AMP exceeded. gain (level) is too high

reduce the gain (level) using the DSP software

select a superior quality head-unit

the head-unit, GZDSP 4.80AMP and each further amplifier

+12 Volt terminal

signal wire has no contact or it´s broken

check the contacts 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

this or further ampl ifier(s) mounted near automotive control units

OEM head-unit´s analog output connected (although car supports MOST connection)

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

non-operational further amplifier

inverted phase of one (or more) speakers

speaker overload

DSP input override (distor tion)

head-unit output override (distortion)

amplifier override (clipping)

head-unit creates noise(s)

diverse power supplies or ground connection

check the remote wire (not required in high-level mode) check the auto-on switch position (in high-level mode) check the +12 Volt connection and wire

check the setting of the head-unit

check the setup using the DSP software

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

set the sound controls of the head-unit to center position

reduce the level to avoid damaging the amplifier or the speakers

use the optica l output (if available) let the audio store or manufacturer check the head-unit

should be wired up to a common ground, as well as a common

choose a mounting position far away from automotive units

use the MOST audio signal of the OEM head-unit*

*Note: To use the digital MOST audio signal of the OEM head-unit as source, an optional MOST to SP/DIF signal converter is requested. Connect the SP/DIF signal directly to the digital input of the GZDSP 4.80AMP using TOSLINK connectors.

- 20 -

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.

Terms of warranty

Ground Zero GmbH

Erlenweg 25, 85658 Egmating, Germany

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

www.ground-zero-audio.com

Ground Zero GZDSP 4.80AMP Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual