Initial Start-Up And Functions - HELIX P TWO Manual

Initial start-up and functions

Caution: To avoid a loss of gain make sure that the
crossover frequencies of the high- and lowpass fil-
ters do have an interval of at least two octaves
when generating a bandpass.
That means if the lowpass signal is adjusted to
320 Hz the highpass should be adjusted to 80 Hz
or less (one octave = doubled frequency or halved
frequency). If a subwoofer is connected we recom-
mend to use the highpass control (control 6) as vari-
able subsonic / low-frequency highpass filter or turn
it counterclockwise to 15 Hz to get a subsonic filter.
8 LPF Frequency
This control is used to adjust the crossover frequen-
cy of the lowpass filter from 15 Hz to 4,000 Hz.
9 Bass Boost Frequency
This control is used to adjust the center frequency
of the bass boost from 40 Hz to 120 Hz. The adjust-
ed bass frequency can be enhanced from 0 to 9 dB
with control 10. This is useful to emphasize or cor-
rect a determined frequency range of the subwoofer
or kickbass.
16
Bass Boost Gain
10
This control is used to increase the adjusted bass
center frequency (see item 9, Bass Boost Frequen-
cy) from 0 to 9 dB.
Input Mode
11
This switch is used to route the input signals to the
respective amplifier channels.
Stereo: If the head unit / car radio provides one ste-
reo output, both speaker outputs are supplied with
the corresponding input signal.
Stereo Summed: In this mode a sum signal is gen-
erated by the input signals of the channels A and B.
Mono: If only the Line Input or Highlevel Input of
channel A is connected, both amplifier channels
are supplied with this signal. In this mode the input
signal of channel A is routed to channel B. Please
consider that the balance control of the head unit /
car radio has the same effect on channel B as on
channel A.
Note: The Optical Input always provides a ste-
reo signal. When this signal input will be used
please choose switch position "Stereo" or "Stereo
Summed", depending on the application.
Optical Input
12
Optical input in SPDIF format for connecting signal
sources with a digital audio output. The sampling
rate of this input must be between 28 and 96 kHz.
Thanks to the SPDIF Direct In switch the input stage
of the P TWO can be bypassed and allows to direct-
ly route the signal from the integrated DA converter
to the internal power stage. For this purpose, you
have to open the device and change the position
of the SPDIF Direct In switch to "On" as well as the
position of the X-Over switch to "Full" (see page 17,
item SPDIF Direct In switch).
Important: The signal of a digital audio source nor-
mally does not contain any information about the
volume level. Keep in mind that this will lead to full
level on the outputs of the HELIX P TWO. This may
cause severe damage to your speakers. We strong-