ENGLISH
6
Install the cabling in a manner which precludes any danger
of the leads being exposed to shear, crushing or rupture for-
ces. If there are sharp edges in the vicinity (e.g. holes in the
bodywork) all cables must be cushioned and protected to
prevent fraying.
Never lay the power supply cables adjacent to leads and
lines connecting other vehicle equipment (fan motors, fire
detection modules, gas lines etc.).
In order to ensure safe installation, use only high-quality connec-
tions and materials. Ask your dealer for HELIX accessories.
1 Connecting the remote lead
The remote lead is connected to the automatic antenna
(aerial positive) output of the head unit (radio). This is only
activated if the head unit is switched ON. Thus the ampli-
fier is switched on and off with the head unit.
2 Connecting the ground cable
The ground cable should be connected to a central ground
reference point (this is located where the negative terminal
of the battery is grounded at the metal body of the vehicle),
or to a bright bare-metal location on the vehicle chassis, i.e.
an area which has been cleaned of all paint residues.
3 Connecting the battery cable
Connect the +12 V cable to the positive terminal of the bat-
tery. Recommended cross section: min. 10mm
2
.
4 Fuses
The input fuses are connected in parallel and provide pro-
tection against an internal equipment fault, i.e. the system
must be additionally protected by a further line fuse located
in the vicinity of the battery (max. distance from battery:
30 cm). The fuse ratings are 2 x 25 amperes, and both must
be installed as the amplifier protection rating is 100 ampe-
res (2 x 25 A).
5 - 7 CPS (Color Protection System)
The LEDs show the operation status of the amplifier.
Blue (No. 5) = on
Yellow (No. 6) = malfunction of amplifier. E.g., battery vol-
tage lower than 8,5 V or over 16 or, speaker wires are shor-
ted to the ground)
Red (No. 7) = the amplifier has shut off due to overheating.
In this case it will take some time (depending on outside
temperature) until it switches on again.
8 - 9 Signal inputs
The HXA 1000 QX has RCA connections for cinch cables
leading from the pre-amplifier outputs, the line outputs of
the head unit or the outputs of a pre-amplifier/equalizer, e.g.
HXE 100. These connections are gold-plated in order to
ensure better signal transmission.
10 Mono/stereo input signal selector
For stereo operation (two cinch leads) the switch has to be
in position B (stereo), both inputs (8 and 9) are occupied.
For mono operation only input 8 is occupied and the switch
is in position A (mono).
11 Add-on subsonic filter
If reqiured an additional subsonic filter (26Hz/30dB/oct can
be switched on.
Position A: subsonic filter off
Positiong B: subsonic filter on
12 Speaker connection terminals
The impedance minimum of all connected speakers must
not be lower than 2 ohms.
Attention!
When tuning bass reflex systems, this value will soon be
fallen below. Please check with the maker of your subwo-
ofer. When using bass reflex systems we suggest to have the
subsonic filter (switch 11, position B) switched on.
Important notice!
Never connect the speaker cables to the vehicle ground
(chassis). This can destroy your amplifier.
13 Level controls for input sensitivity
These controls can be used to match the input sensitivity to
the output voltage of the connected head unit. These con-
trols are not volume controls and are solely intended for the
purpose of sensitivity trimming. The control range extends
from 600 mV to 8,0 V.
14 Damping factor control
For individual sound tuning the damping factor can either
be raised (more bass) or lowered (balanced and warm).
15 Operation mode selector switch
Position A: The amplifier works linear, the integrated active
frequency cross over and the parametric equalizer are swit-
ched off.
Position B: The input signal is sent to parametric equalizer
and can be adjusted with the controls 16 - 19.
Position C: The input signal is sent to the parametric equa-
lizer and to the active frequency crossover and can be adju-
sted with the controls 16 - 19, the switch 20 and the controls
21 and 22.
Parametric equalizer
With its integrated highly innovative parametric equalizer
the HXA 1000 QX amplifier offers a wide range of indivi-
dual subwoofer sound tuning. Switch 14 has to be in positi-
on B or C.
16 Phase control
This conztrol enables the bass signal to be shifted by 180°
in order to achieve optimum delay equalization with the
other channels. (see fig. 1)
17 Setting the center frequencies
Control 17 can be used to select a frequency of
50 - 150 Hz on the preset low-pass frequency band (see con-
trol 22). This center frequency can be raised using control
26, by between 0 and 9 dB. This is desirable if certain fre-
quencies of the subwoofer are to be enhanced (kick bass) or
corrected. (see fig. 2)
18 Band width adjustment
Control 18 can be used to enhance the Q of the frequency set at
control 17. The resultant band width can be infinitely varied
from 10 to 110 Hz. (see fig. 3)
19 Level control for raising the cut-off frequencies
This control enables the center frequency set at control 17
to be raised from between 0 and 9 dB. (see fig. 4)
Important notice!
Incorrect adjustment of the parametric equalizer can have a
considerable deleterious effect on sound quality. In such
cases, consult your HELIX dealer. If this is not immediately
possible, turn controls 16 to 19 completely counter-clock-
wise or turn switch 15 to position A so that the amplifier
operates in the linear mode.
Adjustable frequency crossover
The HXA 1000 QX has an integrated, adjustable active
crossover. For operation position C must be chosen for
switch 15.
20 Switch for high pass, low pass or band pass
Position A: band pass
Pösition B: low pass
Position C: high pass
21 Active high pass filter
With this control the frequency range of the amplifier is
infinitely variable from 50 to 250 Hz as high pass. Chose
position C for switch 20 or position A in the band pass
range.
22 Active low pass filter
With this control the frequency range of the amplifier is
infinitely variable from 50 to 250 Hz as low pass. Chose
position C for switch 20 or position A in the band pass
range.
21 and 22 Active band pass filter
The frequency crossover is in band passs operation when
switch 20 is in position A. Control 21 is used for high pass
setting and control 22 for low pass setting.
Attention: Overlapping frequency settings will result in a
very low signal level that cannot be sufficiently amplified.
For this reason the low pass frequency must at least double
the high pass frequency.
For example:
If high pass is set on 50 Hz, low pass must at least be set on
100 Hz (2 x 500 Hz).
