Initial Start-Up And Functions; Usb Input - HELIX V EIGHT DSP Manual

Initial start-up and functions

1 USB Input

Connect your personal
V EIGHT DSP using the provided USB cable. The
required PC software to configure this amplifier can
be downloaded from the Audiotec Fischer website
www.audiotec-fischer.com.
Please note: It is not possible to connect any USB
storage devices.
2 Control Input
This multi-functional input is designed for HELIX
V EIGHT DSP accessory products like a remote
control which allows to adjust several features of
the amplifier. Depending on the type of remote con-
trol, at first its functionality has to be defined in the
" Device Configuration Menu" of the DSP PC-Tool
software.
3 Control pushbutton
The Control pushbutton allows the user to switch
between the two setup memory positions. To switch
between the setups the button has to be pressed
and held for 1 second. Switching is indicated by
a single red flash of the Status LED. Pressing the
button for 5 seconds completely eras es the internal
memory. This is indicated by a constant flashing of
the Status LED.
Attention: After erasing the setups from memory
the HELIX V EIGHT DSP will not reproduce any au-
dio output.
4 Status LED
The Status LED indicates the current active DSP
setup. Green means that setup 1 is load ed, orange
means that setup 2 is loaded. A flashing red light in-
dicates that no setup is loaded. In that case please
load a new setup via the DSP PC-Tool software. If
the LED starts blinking orange, the internal tem-
perature protection is active. At first the output pow-
er will be reduced to lower the temperature of the
amp. If the temperature still rises the amplifier will
shut down until it has reached a safe temperature
level again.
5 Optical Input
Optical input in SPDIF format for connecting signal
sources with a digital audio output. The sampling
rate of this input must be between 12 and 96 kHz.
The input signal is automatically adapted to the in-
computer to the
ternal sample rate. In order to control the volume of
this input, we recommend to use an optional remote
control.
Notice: This amplifier can only handle stereo input
signals and no Dolby-coded digital audio stream.
6 Highlevel Input
6-channel highlevel loudspeaker input to connect
the amplifier directly to loudspeaker outputs of
OEM / aftermarket radios or OEM amplifiers that do
not have any pre-amplifier outputs. Input sensitivity
is factory-set to 10 Volts (maximum CCW position).
It is possible to vary the sensitivity between 5 and
10 Volts with control 9 (Input Sensitivity). By repo-
sitioning a jumper inside the device the sensitivity
range can be changed to 10 - 20 Volts.
By changing the sensitivity range the input imped-
ance of the highlevel inputs is shifted as well in or-
der to guarantee a perfect operation in combination
with OE radios and high-power OE amplifiers. Input
impedance is set to 13 Ohms for a sensitivity range
of 5 - 10 Volts and 13 kOhms for a sensitivity range
of 10 - 20 Volts.
Attention: Attention: Solely use the pluggable
screw-terminal for the highlevel connector which is
included in delivery or an optional available cable
harness from the HELIX accessory assortment!
Important: It is strictly forbidden to use the High­
level Input and pre-amplifier inputs (Line Input) at
the same time. This may cause severe damage to
the pre-amplifier outputs of your car radio.
7 Line Input
6-channel pre-amplifier input to connect signal
sourc es such as radios. Input sensitivity is
factory-set to 4 Volts (maximum CCW position). It
is possible to vary the sensitivity between 2 and
4 Volts. By repositioning a jumper inside the device
the sensitivity range can be changed to 4 - 8 Volts.
8 Clipping LED
This LED lights up red if one of the six Line Inputs
or Highlevel Inputs is overdriven. The LED has no
function if the device is fed with digital input signals.
If this LED lights up reduce the input sensitivity by
using the control 9 (Input Sensitivity) until the LED
goes out.
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