Ground Zero GZDSP 4.80A-PRO User manual

DSP SERIES
DSP AMPLIFIER
GZDSP 4.80A-PRO
Owner´s manual
Features
•4-channel amplifier with integrated 8-channel signal processor (DSP)
•High-efficient 2 Ohm stable class D amplifier
•5-channel line input (RCA) / 4-channel line output (RCA)
•6-channel high-level input with smart diagnosis-detection
•Auto-on function / Soft delayed remote turn-on
•AUX input (3.5 mm socket)
•Optical digital input (sampling rate up to 24-bit/192kHz)
•Coaxial digital input (sampling rate up to 24-bit/192kHz)
•Suitable for start-stop equipped vehicles
•8-channel digital signal processor (DSP) - Cirrus Logic 32-bit/192 kHz single core chipset
•Simple handling user interface (Windows ® compatible)
•Realtime setup of all functions (via PC)
•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)
•Optional wireless interface for music streaming available
•LED power and status indicator (protection circuit)
•High temperature / short circuit / overload protection circuit)

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
Product description
The GZDSP 4.80A-PRO is a 4-channel amplifier with integrated digital signal processor increasing the
sound quality of the vehicle´s audio equipment. Based on the 32-bit DSP processor in combination with
a 24-bit AD and DA converter. Due to its audio summing function combining 6 high-level channels and
31-band equalizing on each channel (11-bands on the subwoofer channels), the GZDSP 4.80A-PRO
can be integrated into most OEM sound systems even with OEM DSP feature.
Package contents
•1 x GZDSP 4.80A-PRO amplifier
•1 x USB cable (5 m length)
•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 GZDSP Remote PRO/X with LED display incl. connection wire
•Remote-control unit GZDSP Touch-Remote with color LCD display incl. connection wire
•Interface GZDSP BT-Box with connecting cable (for wireless music streaming)
Table of content
General mounting instructions
3
Technical specifications
4
Audio connections (intput)
5
Audio connections (output) / High-level input harness 6
PC software installation
7
Graphical software user interface (GUI)
8
Time alignment setting
9
Dropdown menu / Memory options
10
Error diagnosis
11
Terms of warranty
12

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
General mounting instructions
•As a precaution, it is recommended to disconnect the vehicles battery before mounting the amplifier.
(Note: For new vehicles, disconnecting the battery might cause various errors in your vehicle´s electric
system that can be cleared only by authorized service partners of your vehicle´s manufacturer! Please ask
your service partner first before disconnecting the battery!)
•The power supply wire (+12 V) has to be protected within max. 20 cm / 8” by a main fuse holder with a
fuse value matching the recommendation for your amplifier
(Note: If there is more than one amplifier connected using this power wire, the main fuse value must be
equal to the sum of the recommended fuses of all connected devices. However, make sure the diameter of
your power wire will be enough for the required current!)
•If necessary, replace a defective fuse by a fuse with identical quality and value
•Never drill a hole to the vehicle´s gas tank or brake lines, to wirings or any other important vehicle parts!
•Never pass wires over sharp edges or vehicle parts due avoid any kind of damage
•Keep the wiring away from the antenna and electronic devices contributing to radio reception
•Lay the power supply wiring always separated from speaker wiring to avoid disturbance
•The amplifier contains a temperature protection circuit that turns the device off in case of overheating. After
a certain cooling time, it will turn on automatically. To avoid heat build-up, enough air supply for cooling
must be provided. Never cover the surface of the amplifier´s heatsink entirely
•The amplifier should NEVER be mounted onto a vibrating part or surface such as a subwoofer enclosure.
This might lead to malfunction due to loosened electrical parts inside the amplifier.
•Some amplifiers offer a high-level input option, however if a pre-amplified output (RCA) is available (at the
head unit), it is strongly recommended to make use of them.
GROUND ZERO products are engineered in Germany
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GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
Technical Specifications
Model
GZDSP 4.80A-PRO
Type
4-channel amplifier with integrated signal processor (DSP)
Frequency range
20 Hz – 20 KHz (-3 dB)
RMS Power @ 4 Ω
CEA Standard CEA-2006-A
4 x 80 W (1% THD+N)
RMS Power @ 2 Ω
CEA Standard CEA-2006-A
4 x 130 W (1% THD+N)
Processor type
Cirrus Logic single core 32 bit, 8-channel, 192 kHz
Sensitivity
High level input: 2 – 15 V RMS
AUX input: 0.6 – 5 V RMS
Input resistance
>47 kΩ (low level input)
Output
4-channel speaker output
4-channel line output (RCA)
Input
6-channel high level input / 5-channel line input (RCA)
AUX input (3.5 mm socket)
Digital input: Optical and coaxial input (max. 24bit/192 kHz)
Remote out
max. 130mA
Recommended fuse(s)
2 x 30 A
Dimensions (heatsink only)
w x h x l
185 x 39 x 201 mm
7.28“ x 1.54“x 7.91“
Dimensions (whole unit)
w x h x l
185 x 42 x 237 mm
7.28“ x 1.77“x 9.33“
Software compatibility
Microsoft Windows™ XP SP3, Vista, 7, 8, 8.1,10
Preset
10 x individually adjustable
Gain range
-40 to +12dB
Equalizer
6 x 31 bands / output A - F (20 – 20000Hz), -18 bis +12dB, Q 0.5 - 9
2 x 11 bands / output G&H (20 – 200Hz), -18 bis +12dB, Q 0.5 - 9
Time alignment
0 – 15 ms / 0 – 502 cm per channel
Active crossover
6 / 12 / 18 / 24 / 30 / 36 / 42 / 48 dB/oct (BPF / LPF / HPF Butterworth)
20 – 20000 Hz
Phase shift
0° / 180° per channel
Optionally available
remote control units
GZDSP Remote PRO/X or GZDSP Touch-Remote
(main level, subwoofer level, source selection and preset selection)
GZDSP 4.80A-PRO

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
Recommended wiring
GZDSP 4.80A-PRO
Speaker wire
min 1.5 mm² / 15 AWG
Power supply wire
min 20.0 mm² / 4 AWG
High-level input wire
min 1.00 mm² / 18 AW
Remote wire
min 0.75 mm² / 20 AW
Audio connections (input)
1
Optical Digital Input
To connect a digital audio source. Attention: If the digital audio source has no level control, we
strongly recommend using one of the available remote-control units
2
Coaxial Digital Input
To connect a digital audio source. Attention: If the digital audio source has no level control, we
strongly recommend using one of the available remote-control units
3
Line Input Front
To connect the front line output (RCA) of the head-unit (if available)
4
Line Input Rear
To connect the rear line output (RCA) of the head-unit (if available)
5
Line Input Subwoofer
To connect the subwoofer line output (RCA) of the head-unit (if available)
6
AUX input
To connect an additional source unit (3.5 mm stereo jack).Attention: If the analog audio source
has no level control, we strongly recommend using one of the available remote-control units
7
High-Level Input
To connect the head unit´s speaker wire output if there is no line output (RCA) available. Using
the high-level input, the unit will turn on automatically recognizing the DC level. It´s not necessary
to connect the 12V remote wire to the power terminal.
Caution:
The high-level input and the line input (RCA) cannot be used simultaneously. This may
lead to malfunction and cause serious damage to the unit
8
BT-Box connector
To connect the wireless audio interface GZDSP BT-Box or the remote-control unit
GZDSP Touch-Remote
(available optionally)
9
Line Out
To connect the 4-channel line out harness delivering the audio signal of channel E/F and G/H for
further amplifiers
10
PC Connect
(USB socket)
To adjust the audio setting the unit must be connected to a PC using the included USB cable
(compatible Windows PC with installed DSP software from the CD). The USB cable should not be
extended to ensure an accurate communication between the DSP unit and the PC. Always close
the PC software first before powering off the amplifier to avoid data loss and flash memory errors
11
Auto Turn On
To turn on/off the auto-on function
12
Remote Control
To connect one of the optionally available remote-control units
GZDSP Remote PRO/X
or
GZDSP Touch-Remote
13
Reset Button
In case the unit does not work properly. Power off the amplifier, push and keep pushed the button
while powering on the unit. Release the button after 3 to 4 seconds

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
Audio connections (output)
1
Power Supply Terminal
GND
ground terminal
REM remote wire (to be used as remote output when using the high-level input)
+12V positive terminal of the battery
2
Speaker Terminal
To connect the speaker wires of the according channels
3
Speaker Terminal
To connect the speaker wires of the according channels
4
Fuse(s)
Defective fuses must be replaced by identical values
5
Status indicator
POWER
green - ok (operation mode)
PROTECT red - error (protection mode)
High-level input harness

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
PC software installation
The PC software is compatible* to Windows™ XP (SP3) operating systems (or later). One USB port and 25 MB free
memory space is required for the installation. The files are located on the included CD-ROM. If there is no CD drive
available, the software can be downloaded from the Ground Zero web page:
www.ground-zero-audio.com
* compatible operating systems: Microsoft Windows®XP SP3 / Vista / 7 / 8 / 8.1 / 10
PC requirements: min. 1.5 GHz processor with 1 GB main memory (RAM) and graphic cards
with a resolution of 1024x600 pixels or more
Run the setup.exe file. The installation wizard will install the GUI software for the DSP on the PC system. The driver will
be installed by clicking INSTALL at the appearing window. Restart the PC after the installation has been finished.
Important note:
We strictly recommend using the latest DSP software available from the web page for GZDSP 4.80A-PRO
Connecting the unit to the PC
USB connection: We don´t recommend using any passive extension cable together with the included USB wire, as the
proper function can´t be ensured.
DSP setting: The GZDSP 4.80A-PRO must be connected to a PC with the DSP software installed using the included USB
wire. To adjust the settings, the amplifier must be in operation mode. Double click on the software icon or select from
the software list to start. The program starting window appears.
Windows®user account control (UAC): In case the PC operating system is set to restricted security clearance regarding
software with unknown source or without digital signature a window will appear each time at the program is starting.
Please confirm with >Yes< (language depends on your local setting) to run the program.
Setup note: The first time the GZDSP 4.80A-PRO is turned on and the software is started there is no audio signal on the
output channels (RCA) available unless the channels are activated in the software.
USB connection and COM port / Windows device manager
In order to use the software, the GZDSP 4.80A-PRO must establish a communication to the PC. Therefore, an unused
USB port is required. During the connection of the USB cable the system will assign automatically a USB port. To avoid
misbehavior during the communication, it´s recommended to select a COM port number between 1 and 9. The
assigned COM port number can be checked at the system´s device manager. The GZDSP unit will appear as “USB-
SERIAL CH 340” device (at the COM&LPT list). The COM port can be changed at the properties manually if necessary.
Demo Mode (offline mode): The software
can be used in offline mode without
having the GZDSP 4.80A-PRO connected
to the PC to become familiar with most of
the features and to create sample setups.
Select >Yes< when the start window
appears.

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
1
2
3
4
5
6
7
8
9
Graphical software user interface (GUI)
1
Source selection
MAIN - RCA input or high-level input
AUX
- 3.5 mm socket
DSD
- Coaxial input
BT
- Optionally available interface for wireless music streaming
SPDIF
- Optical input
Level adjustment (-40 dB up to +12 dB)
Attention!
Set up the level carefully to avoid any kind of damage to the loudspeakers.
Recommended value = 0 dB
2
Channel setting
At factory setting (two channels linked = lock is closed) the adjustments will affect
both channels (crossover and equalizer). By clicking the locking symbol, the channels
can be split to do adjustments for each channel separately. Using the copy buttons
positioned below adjustments can be copied according the arrow symbols shown
from one channel to the other.
3
Input routing
Channel selection
Speaker setting
Input: Select the input signal source by clicking the according channel. Red
highlighted channels show the selected channels.
At the factory setting the inputs 1 and 2 are used for each output channel.
Output:
Click on the channel (or pair of channels) to select for adjustments.
Predefined input:
Clicking one of the input buttons below selects a predefined
input setting, automatically. The
MIX
function enables the audio summing of the 6
input channels.
Speaker Type
: Predefined output settings for connected loudspeakers
There are several settings available:
OFF – channel deactivated
Fullrange – HP/LP/BP filters available - select the required filter (point 6)
Tweeter – high pass filter 3000 Hz (12 dB/oct.)
Midrange – bandpass filter 250 / 3000 Hz (12 dB/oct.)
Kickwoofer – bandpass filter 80 / 250 Hz (12 dB/oct.)
Subwoofer – bandpass filter 20 / 80 Hz (12 dB/oct.)

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
4
Gain setting
Time alignment
Phase control
Select:
Click to highlight the channels creating a group for common adjustments.
Gain:
Level adjustment using the arrows up to required value (max=0)
Delay(ms):
Time alignment for each channel using the arrows. The value can be
edited directly, as well. It´s recommended editing the real distance from the listening
point to the according speaker prior to the adjustment of the
Delay(ms)
in detail
Phase:
Clicking the phase buttons inverts the channel´s phase
Mute:
Highlighting the function button mutes the channel
5
Speaker distance
Editing the speaker distance for the time alignment:
Prior to the detailed setting of the time alignment (point 4), all measured distances of
the connected speakers should be edited. Measure the exact distance between the
listening position (head) to the center of the speaker. The according time alignment is
continuously calculated automatically. The calculated alignment values can be
adjusted in detail (check example below). The
>
Reset
<
function deletes the time
alignment setting. Further adjustments remain unchanged.
6
Crossover slope
Prior to the filter selection it´s required to set a speaker type (point 3). In order to use
both, the high pass and the low pass filter (bandpass configuration) select
Fullrange.
The according slope of the crossover can be set at the dropdown menu between 6
and 48 dB/oct.
Note:
The higher the value of the slope, the steeper the roll-off of the
signal (reduction of the level)
7
Crossover setting
Use the sliders to adjust the crossover point between 20 and 20000 Hz. activate the
crossover filter, first (point 6). The value can be edited directly, as well or be changed
at the frequency chart by keeping the yellow or turquoise button clicked and moved
to the desired frequency point at the chart
8
Frequency chart
The frequency chart shows the estimated response of the 31-band equalizer (point 9)
and the crossover adjustments (point 7) of the selected channel (or pair of channels)
9
Equalizer
The level of each equalizer band can be adjusted to the desired dB value using the
slider. Additionally, the Q of the filter can be selected. Use the arrow buttons or edit
the value directly. By clicking >Bypass< the equalizer will be deactivated without
deleting the setting. >Restore< activates the equalizer again. >Reset< deletes the
equalizer setting
Time alignment setting (example)
All measured distances (cm) must be added to the graphic. The
according alignment values will be continuously calculated and
transferred to the Delay(ms) list to be adjusted in detail if necessary.
edit the distances

GROUND ZERO GZDSP 4.80A-PRO
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File dropdown menu
Open
To open a setup file that has been saved previously to the PC
Save*
To save the current setup as a file to the PC
Save as*
To save the current setup as a file with a certain file name
Factory Setting
To set the unit to default settings
Remote Setting
To choose the pair of channels effected by the subwoofer level adjustment of
the wired remote control
Write to Device*
To write the current setup to the preset memory of the unit. At the following
window, the preset number can be selected. The blue frame indicates the
currently selected preset number
Read from Device**
To open one of the available presets from the memory of the unit. The preset
can be selected from the following window. The blue frame indicates the
currently selected preset number
Delete from Device
To delete one of the presets from the memory of the unit. The blue frame
indicates the currently selected preset number
Chinese
To switch between Chinese and English language
Exit
Quit the software
*Note: In order to use the memory function, it is necessary to edit a security code and a phone number, first. Check
below (Memory access restriction)
** Note: To select one of the memory presets, one of the optionally available remote control units can be used, as well
as soon as the USB cable has been disconnected (with GZDSP Remote Pro presets 1 to 9 are available only)
Help dropdown menu
MCU Version
To view the currently installed MCU firmware version
Flash Version
To view the currently installed Flash memory firmware version
Update MCU
To update the MCU. Select the firmware file in the following step
About
To view the current software version
Memory access restriction
The very first time the memory function is used, it is necessary to set a 6-digit security code to
save a preset. Additionally, a phone number* shall be entered
(*Note: Instead of a phone number another numeric code can be entered as alternative)
After connecting the PC again later on, the code has to be entered at the software startup
enabling to load the preset to the GUI software in order to change the settings.
Connection status
By clicking Connected (PC is currently connected) or Disconnected (PC is currently disconnected) the connection
between the PC and the GZDSP 4.80A-PRO will be disconnected or established accordingly. After unintended
detaching of the USB wire or turning off the unit you may proceed to change the adjustments this way.

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
Error diagnosis
Error
Control
Help / Solution
No function PWR LED on?
-check the fusing
-check the remote wire (AUX mode only)
-check the +12 Volt connection and wire
-check the ground connection and wire
No sound
(PWR LED on)
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
non operational further amplifier
-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 optional remote control
unit is too low
-check the setting at the remote control
Single channels
with no function
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 position
-check the setting of the head-unit
wrong setup of input and output mode
-check the setting
GAIN level too low or Mute function
(software) activated
-check the setting
Impure sound,
incorrect stereo
reproduction
inverted phase of one or more speakers
-check the polarity of the speaker connection
-check the polarity of the high-level input
-check the PHASE setting
-check the TIME ALIGNMENT adjustment
Distorted sound
quality
speaker overload
-reduce the volume level
-check the high pass filter and slope
DSP input override (distortion)
-select the correct input mode
-pay attention to the input sensitivity of the unit
head-unit output override (distortion)
-reduce the volume level of the head-unit
-set the sound controls of the head-unit to center position
-deactivate the Loudness function of the head-unit
amplifier override (clipping)
-max output power of the GZDSP 4.80A-PRO exceeded.
-reduce the level to avoid damage to the amplifier or speakers
Increased
noise level
GAIN level is too high
-reduce the GAIN level (software)
head-unit creates noise
-select a superior quality head-unit
-use the optical output (if available)
-let the audio store or manufacturer check the head-unit
Car specific
interferences
audible through
the audio system
diverse power supplies or ground connection
-the head unit, GZDSP 4.80A-PRO and each further amplifier
should be wired up to a common ground as well as +12 Volt
connection
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 4.80A-PRO or futher amplifier
mounted close to an automotive control unit
-choose another mounting position
analog output of an OEM MOST head-unit
connected
-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 4.80A-PRO

GROUND ZERO GZDSP 4.80A-PRO
DSP SERIES
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. [phone] Fax -8310
www.ground-zero-audio.com