Audiotec Fischer HELIX DARK BLUE Bedienungsanleitung Seite 7

1 Connecting the ground cable
The ground cable should be connected to a central
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.
2 Connecting the remote lead
The remote lead is connected to the automatic antenna (aeri-
al positive) output of the head unit (radio). This is only activa-
ted if the head unit is switched ON. Thus the amplifier is swit-
ched on and off with the head unit.
3 Connecting the battery cable
Connect the +12 V power cable to the positive terminal of the
battery. Recommended cross section: min. 16mm
4 Fuses
The input fuses are connected in parallel and provide protec-
tion 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 rating for DARK BLUE 2 is 1 x 30 amperes and
2 x 25 amperes for the DARK BLUE 4.
5 Speaker terminals
To connect the speaker cables. See figures on page 6.
Never connect the loudspeaker cables with the car chas-
sis gound. It damages your amplifier. Ensure that the loud-
speaker systems are correctly connected (phase), i.e. plus to
plus and minus to minus. Exchanging plus and minus causes
a total loss of bass reproduction.The plus pole is indicated on
most speakers.
The impedance per channel should not be lower than
2 ohm as overheating could cause a shut down of the ampli-
fier.
6 Signal inputs
The DARK BLUE amplifiers have RCA connectors for RCA
cables that can be connected with the pre-amplifier output of
the line-outputs of the headunit or with a pre-amplifier. This
connectors are gold-plated to ensure a better signal trans-
mission.
7 High- and low level signal switch
To change the input signals from low level (head unit or pre-
amplifier) to high level (speaker outputs of head unit). In both
cases RCA cables function as line-inputs.
Downloaded from www.Manualslib.com
8 Level controls for input sensitivity
ground These controls can be used to match the input sensitivity of
the individual channels to the output voltage of the connec-
ted head unit. These controls are not volume controls and are
solely intended for the purpose of sensitivity trimming. The
control range extends from 200 mV to 8 V.
9 Bassboost control
To raise the bass signal from 0 to 18 dB at 45 Hz.
dB
variabel
2
.
20 30 45 100 200
0 dB 18 dB
10 Frequency range control for highpass
To adjust the crossover frequency from 15 Hz to 4000 Hz
Highpass: 15 - 4 kHz
variabel
15 Hz
11 Control for HP / Fullrange / and TP/BP
To switch from the internal active frequency crossover to high
pass / full range / full range (linear) or lowpass.
If this switch is set on HPF Highpass the crossover frequen-
cy for the highpass can be adjusted with control 10.
At switch position Full (fullrange) the internal frequency cros-
sover is not active.
At switch position LP/BP (lowpass/bandpass) the highpass is
always active. That means a bandpass is built in any case.
With switch 10 adjust the highpass and with control 12
adjust the lowpass. Thus every desired bandpass between
15 Hz and 4000 Hz can be adjusted.
manuals search engine
Stereo
Hz
300 500
4-channel
2K 5K Hz
4 kHz
2-channel
SPEAKER CONNECTIONS DARK BLUE 2
Mono
SPEAKER CONNECTIONS DARK BLUE 4
3-channel
7