Ground Zero GZEQ 4.7X User manual

PARAMETRIC
EQUALIZER
ANLEITUNG / OWNER‘S MANUAL
GZEQ 4.7X
Features
•Pre amplifier with adjustable input sensitivity
•Up to 7 Volts RMS output
•Individual left and right sensitivity control for Main & Aux
•Four band parametric equalizer with 16 dB boost cut
•Specific boost frequency for each band
•Low noise BI-FET op-amp for low distortion
•Subwoofer output and level controls
•Front & Rear fader
•Subwoofer LPF adjustable (50 Hz ~ 250 Hz)
•Universal Half-DIN chassis for ease of installation
•Main/Aux (Radio/CD) input selector

2
Technical data
Parametric range
Sub 20 - 70 Hz
Low 150 - 400 Hz
Mid 1.5 - 4 kHz
High 10 - 20 kHz
Boost cut -16 -> +16 dB
Bandwidth Specific to each band-hi shelving
Signal to noise ratio 90 dB Ref 1V input
Frequency response 5 Hz - 30 kHz +/- 1 dB
Sub Level LPF 50Hz ~ 250 Hz ( 12 dB slope)
Output impedance 50 K Ohm
Max. output voltage 7 V RMS
THD 0,05 %
Input sensitivity Adjustable 50 mV ~ 3 V RMS
Input impedance 15 k Ohm
Stereo separation 82 dB / 1 KHz
Operating voltage 11-15 V Negative Ground
Dimensions Width x Height x Depth 175 x 25 x 95 mm
6.89“ x 0.98“ x 3.74“

3
Controls
1
Fader control
This control adjusts the volume between the front and rear output
2
Input selector switch
This switch selects the AUX or MAIN input.
3
Illumination switch
Red / Blue color back light select switch.
4
Master volume control
Main control to adjust the output level.
5
Subwoofer output volume
This control adjusts output level of subwoofer RCA output. By using
a small screwdriver you can also adjust the cut off frequency of the
subwoofer output between 50 and 250 Hz.
6
Parametric Equalizer controls
To control the boost level. By using a small screwdriver you can
also adjust the boost frequency.
Wiring
+12V
Remote
turn on
Masse / Ground
Aux-Input (CD, DVD, MP3 Player,…)
Head Unit
Sub
Verstärker /
Amplifier
Full Range
Verstärker /
Amplifier
Subwoofers
Front
Lautsprecher /
Speaker
Rear
Lautsprecher /
Speaker

4
Set-up adjustment
We recommend to use an oscilloscope for an adequate adjustment. With that tool you can detect
the maximum possible, distortion-free output-level of the head unit and the GZEQ 4.7X by using a
sine wave signal.
In case you do not have the possibility to proceed as per above description, please follow the
instruction below:
Before turn on:
-Turn the master volume of the GZEQ 4.7X fully counter- clockwise to MIN position
-Turn the L + R input gains on top of the GZEQ 4.7X fully counter- clockwise to MIN
position
-Turn the head unit volume to minimum.
-Set all EQ controls to flat (12 o’clock).
System turn on:
-After completing all wiring and signal connections you can turn the system on.
Adjust:
-Turn the input sensitivity of the connected amplifiers between min and ¼.
-Turn the main volume of the GZEQ 4.7X to maximum.
-Adjust left and right input gains of the GZEQ 4.7X to middle position
-Gradually increase head unit volume until clipping. Use a high quality signal (high
resolution CD! No compressed audio files!) Set back all sound affecting adjustments of
the head unit.
-Start carefully increasing input gains of the GZEQ 4.7X until distortion is audible, then
reduce slightly.
Make sure that the head unit volume should be set between ½ and ¾. Always use the GZEQ 4.7X
volume control as a master (main) volume control.
To avoid any defect and realize the maximum performance, we anyhow recommend to ask your
dealer for assistance.
Warning
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, thus constituting to a potential traffic hazard. In the interest of safety, Consumer Electronics
recommends listening at lower volume levels while driving.

5
Troubleshooting
Die Gewährleistung entspricht der gesetzlichen Regelung. Eine Rücksendung kann nur nach vorheriger Absprache und in der
Originalverpackung erfolgen. Bitte unbedingt einen maschinell erstellten Kaufbeleg und eine Fehlerbeschreibung beilegen. Von der
Gewährleistung ausgeschlossen sind Defekte, die durch Überlastung, unsachgemäße Behandlung oder bei Teilnahme an Wettbewerben
entstanden sind. Wir behalten uns das Recht vor, zukünftig nötige Änderungen oder Verbesserungen an dem Produkt vorzunehmen ohne
den Kunden darüber zu informieren.
Limited warranty - defective products must be returned in original packaging - please add a copy of the original purchasing invoice showing
the purchasing date and a detailed description of the failure. Failure caused by overload, misuse or by using the product for competition
purpose are not covered by the warranty. We reserve the right to make needed change or improvement to the product without informing
customer about this in advance.
De Garantie bepalingen van alle door ground zero geleverde producten is volgens wettelijke
bepalingen geregeld, Een retourzending kan alleen na duidelijke afspraak en in de originele
verpakking plaatsvinden.SVP een aankoopbon en een duidelijke storingsomschrijving bijvoegen.Van garantie uitgesloten zijn defecten door
overbelasting, onkundig gebruik, of door deelname aan wedstrijden (SPL) ontstaan zijn. Wij behouden ons het recht om de nodige
veranderingen of verbeteringen aan het product door te voeren zonder de klant hierover te informeren.
La garantie est conforme aux droits légaux. Un retour du produit défectueux doit être dans son
emballage d'origine sur présentation du reçu ou de la facture indiquant la description du defaut.La présente Garantie n'est pas applicable
lorsque le produit a été endommagé en raison: Mauvaise alimentation, Trop de puissance (HP,Subwoofer) Accident, Installation ou
Utilisation non conforme aux normes Technique (Concours SPL etc). Nous nous réservons le droit d'entreprendre à l'avenir nécessairement
des modifications ou des
améliorations au produit sans informer le client.
Ground Zero GmbH
Erlenweg 25, 85658 Egmating, Germany
Tel. [phone] Fax -8310
www.ground-zero-audio.com
Symptom
Possible remedy
Signal processor dies not turn
on
-No remote turn-on wire
-+12V wire is not connected
-Ground wire is properly connected
Level of sound is low
-Wiring is not loose or cables
misconnected / disconnected
-RCA cables are faulty
Background noise is too high.
-Wiring is not loose or cables are
misconnected / disconnected
-Ground wire is properly connected
-RCA cables are faulty