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Ground zero GZHA 2250 X Manual

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7
Controls and functions
1 Speaker terminals For connection of the speakers
2
Power terminals
GND -> Ground connection
REM -> Remote antenna terminal
BATT -> +12 Volt
3 Satus indication
BLUE
–
OK
RED – Error
4 Cinch inputs
Terminal for connection of the RCA wires.
To avoid failure, please use high quality RCA wires.
5 Input level controlle
r
With this controller you can adjust the input sensitivity.
6
Bass boost controlle
r
(GZHA 2250XII)
For adjusting of the bass boost level in the range from 0 to +12 dB.
7
Bass frequency controller
(GZHA 2250XII)
For adjusting of the bass boost frequency in a range from 30 to 80 Hz.
8
High pass controller
(Subsonic for GZHA 2250XII
and CH 3+4 GZHA 4120XII)
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 3000 Hz will be
reproduced.
9 Mode switch
A
djust the crossover for the chosen utilization.
LPF – Only bass frequencies (below 30Hz - 250Hz) will be reproduced.
FULL – All frequencies will be reproduced.
HPF – Only middle and high frequencies (over 40 Hz – 3 KHz) will be
reproduced.
GZHA 2250XII / GZHA 4120XII CH 3+4:
At LPF adjustment, also the Highpass (Subsonic) is activated.
This equals a Bandpass filter of 5 – 250 Hz.
GZHA 4120XII CH 1+2
The Lowpass filter is not adjustable. It is fixed at 80 Hz.
10 Low pass controller
For subwoofer and Kickwoofer operation -
Only frequencies from 30 Hz to 250 Hz will be reproduced (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.
GZHA 2250XII / GZHA 4120XII CH 3+4:
At LPF adjustment, also the Highpass (Subsonic) is activated.
This equals a Bandpass filter of 5 – 250 Hz.
11
Phase shift controlle
r
(GZHA 2250XII / 4120XII)
This controller allows you to fit the subwoofer channel in-phase to the
front system.
12 Remote control input For connection of the bass remote control.
13
Cinch outputs
(GZHA 4120XII)
For fullrange operation of an additional amplifier.
8
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.
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
80 Hz 7,5 mH 470 uF
100 Hz 6,5 mH 330 uF
120 Hz 5,5 mH 370 uF
150 Hz 4 mH 220 uF
… 12 …


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