Connection Of Master And Slave Mode; Speaker Connection - HELIX Dark Blue Instruction Manual

1 Fuse
The input fuse (DARK BLUE 1000.1 only) provides protection
against an internal equipment fault. In addition, the amplifier
must be protected by a further line fuse located in the vicini-
ty of the battery (max. distance from battery: 30 cm). For this
fuse the rating for DARK BLUE 1000.1 is 1 x 80 amperes and
120 amperes for the DARK BLUE 1000.2
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
2
battery. Recommended cross section: min. 25 mm . (35 mm
for DARK BLUE 1000.2)
4 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.
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
1 ohm as overheating could cause a shut down of the ampli-
fier.
6 Speaker connection for Master and Slave Mode
See figures on this page and instructions following No. 16
7 Protect Bridge
To reach maximum power from the Master and Slave Mode
during competition (60 to 80 Hz test tone) for a low-ohmic
subwoofer combination, the protection circuit can be
deactivated by bridging the Protect Bridge contacts.
Don't bridge contacts when operated with music signals.
8 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.
9 Signal outputs
Full range RCA outputs to connect other amplifiers.
10 Level controls for input sensitivity
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 6 V.
2
11 Bassboost control
To raise the bass signal from 0 to 18 dB at 45 Hz.
dB
variable
20 30 45 100 200 300 500
0 dB
18 dB
12 Lowpass control
To adjust the crossover frequency from 35 Hz to 250 Hz.
Caution! To avoid a lost of sound pressure make sure
that the crossover frequencies of subsonic- and lowpass
are separated by 2 octaves.
That means: If the lowpass signal is adjusted to 60 Hz the
subsonic should be adjusted 2 octaves lower on approx.
15 Hz. (1 octave = double frequency or half frequency)
13 Frequency range control for subsonic filter
The use of the adjustable subsonic filter (10 - 50 Hz) relieves the
amplifiers as well as the subwoofer by eliminating unreprodu-
cable frequencies.
CONNECTION OF MASTER AND SLAVE MODE DARK BLUE 1000.1
Amplifier 1
Master
Signal Input
Amplifier 2
Slave
Hz
SPEAKER CONNECTION DARK BLUE 1000.2
Stereo Mono
7