11
1 Power/Protect LED
The Power/Protect LED indicates the operating state
of the amplifier. A green LED shows that the amplifier is
ready for operation.
A red LED indicates that a malfunction has occurred.
A malfunction may have different causes as the HELIX B
FIVE is equipped with different protective circuits. These
protections shut off the amplifier in case of overheating,
over- and undervoltage, short-circuit on loudspeakers,
low impedance and false connection.
Please check for connecting failures such as short-
circuits, wrong connections, wrong adjustments and over-
temperature. If the amplifier does not turn on it is defect
and has to be send to your local authorized dealer for
repair service. A detailed description of the malfunction
and the purchase receipt has to be attached.
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. Recommended cross section: min. 25 mm
2
.
3 Connecting the remote lead
The remote lead should be 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 amplifier is switched on and off with the head unit.
4 Connecting the battery cable
Connect the +12 V power cable to the positive terminal of
the battery. Recommended cross section: min. 25 mm
2
.
5 Fuses
The input fuses are connected in parallel and provide
protection 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 / 12"). The fuse value for the HELIX
B FIVE is 3 x 30 Amperes.
6 Speaker terminals
To connect the speaker cables. See figures on page 13.
Never connect the loudspeaker cables with the car
chassis ground. It damages your amplifier. Ensure that the
loudspeaker 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 Ohms. In this case the protection electronics shut down
the amplifier.
7 & 22 Signal inputs
The HELIX B FIVE is equipped with 6 RCA inputs. They can
be connected with the pre-amplifier outputs / line outputs
of the control device (head unit, processor etc.).
Please consider that a sum signal for the 5th channel is
formed by the last two signal inputs (channel 5 „L“
and „R“).
8 Highlevel speaker input
The HELIX B FIVE is equipped with four extra highlevel
speaker inputs. They can be directly connected to the
speaker outputs of the head unit.
We recommend to operate the highlevel input only
with the enclosed connecting cable or with a HELIX wire
harness (optional) to avoid wrong connections or damage
of the connector.
9 Input signal mode switch
2-channel - 4-channel - 5-channel mode
2-channel mode: When head units with one stereo
output are operated, all amplifier channels are supplied
with this signal. This means, that only the first and
second RCA / highlevel input must be connected.
In this mode the channel 1 input signal is relayed
parallel to channel 3 and channel 2 is relayed parallel to
channel 4. For channel 5 (subwoofer output) a sum
signal is formed by the channel 1 and channel 2 input
signals.
