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Ground zero GZRA 4100 X Manual

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11
Controls and functions
1
Power terminals
GND -> Ground connection
REM -> Remote antenna terminal
BATT -> +12 Volt
2 Speaker terminals For connection of the speakers
3 Satus indication
GREEN – OK
RED – Error
4 Remote control input For connection of the bass remote control.
5
High pass controller
(Subsonic)
Set the filter switch to „HIGH“ position.
Adjust the variable HPF crossover frequency to the desired frequency
using the controller. All frequency between 5 and 4000Hz will be
reproduced.
6 Low pass controller
For subwoofer and Kickwoofer operation -
Only frequencies from 40Hz to 4000Hz will be reproduced (GZRA
4.100G(-W)) / 40 – 500 Hz (GZRA 2.200G(-W)) or 30 – 250 Hz (GZRA
1.600D(-W)) (depending on the LPF filter controller position). Set the
filter switch to „LOW“ position. Adjust the variable LPF frequency to the
desired frequency using the controller.
At LPF adjustment, also the Highpass (Subsonic) is activated.
This equals a Bandpass filter of 5 – 4000Hz (GZRA 4.100G(-W)) /
5 – 500 Hz (GZRA 2.200G(-W)).
7 Bass boost controller For adjusting of the bass boost level in the range from 0 to +12 dB.
8 Input level controller With this controller you can adjust the input sensitivity.
9
Subsonic controller (GZRA
1.600D)
For adjustment of the subsonic filter in a range of 5 – 50 Hz.
10
Phase Shift Regler
(GZRA 1.600D)
This controller allows you to fit the subwoofer channel in-phase to the
front system.
11 Mode Schalter
Adjust the crossover for the chosen utilization.
LPF – Only bass frequencies below 40Hz -4000 Hz (GZRA 4.100G(-W)) /
40 – 500 Hz (GZRA 2.200G(-W)) will be reproduced.
FULL – All frequencies will be reproduced.
HPF – Only middle and high frequencies (over 5Hz – 4000Hz) will be
reproduced.
At LPF adjustment, also the Highpass (Subsonic) is activated.
This equals a Bandpass filter of 5 – 4000Hz (GZRA 4.100G(-W)) /
5 - 500 Hz (GZRA 2.200G(-W)).
12 Cinch inputs
Terminal for connection of the RCA wires.
To avoid failure, please use high quality RCA wires.
13 Output For connection of additional amplifiers.
Turning on the amplifier
The amplifier automatically turns on a few seconds after you turn on your radio.
Note: Your amplifier temporarily shuts down if it gets too hot, then restarts automatically once it cools
(At about 80° / 176° F).
Adjusting the audio level
1. LEVEL (Min/Max): Turn fully counter- clockwise to MIN position
2. Turn the auto sound system's volume control to about two-third of its full range.
3. Adjust LEVEL to a comfortable listening level.
12
Connecting the speaker for trimode operation - notes
TRI MODE operation output allows a subwoofer to be operated in mono mode while the main speakers are
playing in stereo. Leave the crossover switch on “Full” position.
Use 100 volt, non-polar capacitors for a high pass crossover to filter out low frequencies and Air- core or
Ferrit- ore coils with a minimum diameter of 1 mm / 0.039” for the lowpass crossover to filter out high
frequencies.
The capacitor and inductor values as written in the below table. The front and rear channels of this amplifier get
this capability. Only the rear left and right channels are shown on the following pictures.
Values for 6dB passive crossover
Frequency
Inductor
Capacitor
7,5 mH
470 uF
100 Hz
6,5 mH
330 uF
120 Hz
5,5 mH
370 uF
150 Hz
4 mH
F
… 46 …


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