HELIX blue B FIVE Bedienungsanleitung Seite 14

The HELIX B FIVE offers many different options for
operating a speaker system in fully active mode. This
means that each speaker is connected to a separate
channel and no passive crossovers are used. A 2-way
speaker system, consisting of two tweeters and two
woofers each, and one subwoofer is the typical choice for
this operating mode. The ideally coordinated HELIX blue
speaker systems, such as the „HELIX B 62C"
(2-way component system) and the „HELIX B 12E"
30-cm subwoofer in a closed box), are perfectly suited to
this use.
Connecting the speakers:
Each speaker is connected directly to a separate channel
on the power amplifier without the use of any passive
crossovers. The speakers should be connected as follows:
- In fully active mode, the tweeters (of the „B 62C") are
directly connected to speaker outputs 1 („CH 1") and
2 („CH 2") on the amplifier.
- The woofers (of the „B 62C") are connected to speaker
outputs 3 („CH 3") and 4 („CH 4").
- The subwoofer („B 12E") is connected to the 5th
speaker output („CH 5").
Signal inputs:
There are a number of different connection options for the
allocation of the signal inputs in fully active mode. You will
find a detailed explanation of the way in which the input
signal switch (9) works on Page 4. The GAIN control knob
is used to adjust the volume of the individual speaker
outputs.
- 2-channel mode: In this case, only the cinch or high-
level signal inputs from Channel 1 („CH 1") and
2 („CH 2") are supplied with the signal. The input
signal switch is set to „2-CH".
- 4-channel mode: In this case, the cinch or high-level
signal inputs from channels 1 to 4 are supplied with
the signal. For this option, the corresponding input
signal is allocated to each speaker output; the subwoofer
output is supplied with the sum of all the input signals.
The input signal switch is set to „4-CH".
- 5-channel mode: In this case, all five cinch inputs on
the amplifier are supplied with the signal and the
14
FULLY ACTIVE MODE
signal is then allocated to the corresponding speaker.
When using the high-level signal input, we recommend
using the 4-channel mode. The input signal switch
is set to „5-CH".
Crossover:
It is particularly important to set the internal crossover
correctly. If not, the speakers connected might be damaged
as a result.
- Channel 1 and 2: For these channels, a highpass filter
(„HPF") must be set in the internal crossover (switch
12). The cut-off frequency is usually between 2 kHz
and 4 kHz. For our example system, the B 62C, this
value should be set at approx. 3 kHz.
- Channel 3 and 4: For these channels, a bandpass must
be activated in the internal crossover. To do so, set the
lowpass filter („LPF") (switch 16), which automatically
forms a bandpass. The frequency of the lowpass filter
(18) should be set to the same frequency as the
highpass frequency for Channel 1 and 2, i.e. approx.
3 kHz. After that, another highpass frequency (17) is
set to configure a bandpass. For our system, the value
should lie somewhere between 70 Hz and 90 Hz. Bass
Boost is not used in the fully active mode.
- Channel 5: The low pass is always active for this
subwoofer channel. The lowpass filter (19) should be
set to the same frequency as the highpass filter for
Channels 3 and 4, i.e. between 70 Hz and 90 Hz. In
addition, the intensity of the woofer reproduction can
be increased for this channel by adjusting the
Bass-Boost control knob (20).