HELIX M FOUR Instruction Manual page 12

Connectors and control units
Line Input
1
RCA inputs for connecting lowlevel line
signals.
Highlevel Input
2
Highlevel speaker inputs for connecting a
factory radio or an aftermarket radio without
lowlevel line outputs.
Input Level
3
Control for adjusting the input sensitivity of
the lowlevel Line and Highlevel Inputs for the
individual stereo signals.
HPF
4
Control for adjusting the highpass filter from
15 Hz to 4,000 Hz.
Speaker Output
8
Speaker outputs for connecting speaker
systems.
Power & Protect LED
9
This LED indicates the operating mode of the
amplifier.
+12 V
10
Connector for the +12 V power cable of the
positive terminal of the battery.
12
1 2 3
3
5
6
7
8 9
11
12
4 5 6
4 5 7
X-Over
Switch for activating the filters for each
channel pair.
Input Mode
Switch to route input signals to respective
amplifier channels.
LPF
Control for adjusting the lowpass filter of the
channels C and D from 40 Hz to 4,000 Hz.
10 11 12
REM
Connector for the remote cable.
GND
Connector for the ground cable (negative
terminal of the battery or metal body of the
vehicle).