12 Switch for
highpass - fullrange - lowpass / bandpass
To switch the internal active frequency crossover to highpass,
fullrange (linear) or lowpass / bandpass.
If this switch is set on HPF (highpass), the exact crossover
frequency for the highpass can be adjusted with control 11.
At switch position FULL (fullrange) the internal frequency
crossover is not active.
At switch position LPF (lowpass / bandpass) the highpass is
al
ways active. That means a bandpass is built in any case.
As highpass (11) and lowpass (13) are adjusted every desired
bandpass between 15 Hz and 4000 Hz can be adjusted.
Caution! To avoid a lost of sound pressure make sure that the
crossover frequencies of high- and lowpass are separated of
2 octaves when building a bandpass.
That means: If the lowpass signal is adjusted to 320 Hz the
highpass should be adjusted 2 octaves lower on approx.
80 Hz. (1 octave = double frequency or half frequency)
If a subwoofer is connected we recommend to use the-
highpass control 11 as variable subsonic filter or turn it
counter-clock-wise to 15 Hz to get a subsonic filter.
13 Lowpass control
To adjust the crossover frequency from 40 Hz to 4000 Hz.
14 Signal outputs
Wide band (fullrange) RCA outputs to connect other ampli-
fiers.
SPEAKER CONNECTIONS HELIX B FOUR
4-channel 3-channel 2-channel
Channel 1 Channel 2
Channel 3 Channel 4
Channel 1 Channel 2
Channel 3 (CH3 + CH4 bridged) Channel 2 (CH3 + CH4 bridged)
Channel 1 (CH1 + CH2 bridged)
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