HFi55.4 / HFi100.4 4-CHANNEL AMPLIFIER APPLICATIONS
4 CHANNEL FULL RANGE SYSTEM
2 or 3 CHANNEL SYSTEM
- HI PASS: N/A
Here we show how to use the 4 channel amplifiers as straightforward discrete 4
- LOW PASS: N/A
channel full range units.
Interconnect cable checklist:
Channels 3/4:
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
- HI PASS: N/A
- LOW PASS: N/A
Switch setting checklist:
- 1/2CH X-OVER: FULL
Level control checklist:
- 3/4CH X-OVER: FULL
- Refer to the section “Setting up systems after installation for best performance”
Minimum final loudspeaker impedances:
Crossover frequency control checklist:
- 2 ohm per channel.
Channels 1/2:
Switch setting checklist:
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking
- 1/2CH X-OVER: FULL
advantage of the mono bridging capability of all Hifonics amplifiers.
- 3/4CH X-OVER: LPF
The following example shows how to create a 3 channel system by mono
bridging channel pair 3 / 4. In order to create a 2 channel system, simply follow
Crossover frequency control checklist:
the example to also mono bridge channel pair 1 / 2.
Channels 1/2:
- HI PASS: N/A
Interconnect cable checklist:
- LOW PASS: N/A
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head
unit with good quality RCA cables.
Channels 3/4:
- A MONO signal source is required to bridge channel pair 3/4, such as would be
- HI PASS: N/A
available from the mono sub bass output of an active crossover, whether
- LPF: 11 o’clock
standalone, or built into a head unit or equalizer. If you only have 1 set of RCA
outputs from your headunit, you can simply connect those to the inputs for ch
TIP: If you are using the mono sub bass output of an active crossover, there is
1/2 and switch the MODE to 3ch. The amplifier will auto sum the signal and
nothing wrong with switching in the low pass filter in these amplifiers for a
provide mono output for bridged channels 3/4.
steeper low pass rolloff.
Important: Do not be tempted to connect the hot, or positive outputs, from any
source together to obtain a mono signal, as this could very well damage the
Level control checklist:
output stage of that source.
- Refer to the section “Setting up systems after installation for best performance”
- It is necessary to feed the SAME signal to both left and right inputs via a Y-
adapter RCA cable.
Minimum final loudspeaker impedances:
- Connect the mono speaker positive terminal to the RIGHT +, and its negative
- 2 ohm per channel in stereo mode.
terminal to LEFT - as shown.
- 4 ohm mono bridged.
4
LINE OUTCH3/4 CH1/2
L L
R R
6V 0.2V 0dB 12dB FULL LPF HPF 60Hz 12KHz 30Hz 250Hz
LEVEL BASS EQ X-OVER HPF LPF
6V 0.2V 0dB 12dB FULL LPF HPF 60Hz 12KHz 30Hz 250Hz 2 3 4
LEVEL BASS EQ X-OVER HPF LPF MODE
POWER
PROTECT
POWER INPUT
GND REM BATT+12V
CH 1/2 SPEAKER OUTPUT CH 3/4
RIGHT LEFT RIGHT LEFT
- + - + - + - +
BRIDGED BRIDGED
FUSE
H F
LINE OUTCH3/4 CH1/2
L L
R R
6V 0.2V 0dB 12dB FULL LPF HPF 60Hz 12KHz 30Hz 250Hz
LEVEL BASS EQ X-OVER HPF LPF
6V 0.2V 0dB 12dB FULL LPF HPF 60Hz 12KHz 30Hz 250Hz 2 3 4
LEVEL BASS EQ X-OVER HPF LPF MODE
POWER
PROTECT
POWER INPUT
GND REM BATT+12V
CH 1/2 SPEAKER OUTPUT CH 3/4
RIGHT LEFT RIGHT LEFT
- + - + - + - +
BRIDGED BRIDGED
FUSE
H F
STEREO LINE INPUT
MONO LINE INPUT
(Unless using procedure
listed above for 3ch)
(16 pages)
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