Table of Contents
Advertisement
Available languages
Available languages
Input Mode switch (stereo / mono)
17
This switch is used to adapt the amplifier to the
number of used inputs.
Stereo: Select this switch setting if both input chan-
nels (A and B) are used. In this mode an optimized
sum signal is generated by the input signals of the
channels A and B.
Mono: In mono operation only input channel A
needs to be connected e.g. the signal source only
provides a mono signal for subwoofer applications.
Power & Protect LED
18
The power and protect LED indicates the operating
mode of the amplifier.
Green:
The amplifier is ready for operation.
Yellow:
The amplifier is overheated. The internal
temperature protection shuts down the device until
it reaches a safe temperature level again.
Flashing yellow:
The fuses inside the device are
blown. Please check the fuses and, if necessary,
replace them. They may only be replaced by identi-
cally rated fuses (3 x 30 Ampere) to avoid damage
of the amplifier.
Red:
A malfunction has occurred that may have dif-
ferent root causes. The HELIX C ONE is equipped
with protection circuits against over- and undervolt-
age, short-circuit on loudspeakers and reverse con-
nection. Please check for connecting failures such
as short-circuits or other wrong connections. If the
amplifier does not turn on after that it is defective
and has to be sent to your local authorized dealer
for repair service.
Fuses
19
The input fuses are connected in parallel and pro-
vide protection against an internal fault of the de-
vice, therefore the system must be additionally pro-
tected by a further main fuse located close to the
battery (max. distance from battery: 30 cm / 12").
The HELIX C ONE is equipped with 3 x 30 Ampere
fuses.
Impedance selection switch
20
By using the impedance selection switch the im-
pedance of the connected loudspeakers (4 Ohms,
2 Ohms or 1 Ohm) has to be selected accordingly.
If several loudspeakers are connected, the imped-
ance can be approximately calculated as follows:
Series connection: Z total = Z x n
Parallel connection: Z total = Z / n
(n = amount of loudspeakers; Z = loudspeaker im-
pedance)
Note: If speakers with "3 Ohms" impedance are
used, please choose the position "4 Ohms".
Important: In TwinPower Link operation both am-
plifiers must have the same impedance setting (see
page 19, item 7; TwinPower Link switch).
LED switch
21
This switch is used to turn on and off the extended
LED illumination of the amplifier. It has no effect on
the LEDs below the fan, which are used as ultra
low-noise current sources in the output driver stag-
es. The functionality of the Power & Protect LED
remains unaffected as well.
Note: The number of illuminated LEDs depends on
the settings made on the amplifier – e.g. MONO or
STEREO mode.
Cutoff Frequency switch
22
These switches are used to adjust the maximum
upper cutoff frequency of the highpass (HPF) and
lowpass (LPF) filter. Afterwards a fine tuning can be
done with control 10 (LPF) and 11 (HPF).
X-Over switch
23
This switch allows to set the internal crossover to
highpass, fullrange or bandpass mode.
If the X-Over switch is set to HPF the crossover fre-
quency for the highpass can be adjusted with the
respective Cutoff Frequency switch (22) and control
(11 / HPF).
At switch position FULL (fullrange) the crossover is
bypassed.
At switch position BPF a bandpass is created in
any case. This means that the highpass is always
active. By adjusting the highpass (switch 22 and
control 11 / HPF) and lowpass (switch 22 and con-
trol 8 / LPF) filter any bandpass between 15 Hz and
4,000 Hz can be realized.
21
Advertisement
Table of Contents
