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4-Channel Amplifiers
FX4.50 / FX4.70 / FX4.100
6
FEATURES:
- 2 Sets of RCA inputs
- LEVEL: Variable sensitivity from 0.2V to 6V
- BASS EQ: Adjustable 45Hz bass boost from 0dB to 9dB
- X-OVER: Selects internal crossover functions
- FULL: Bypasses all crossovers for full frequency operation
- LP: Selects the built in LOW PASS filter, variable from 30Hz to 150Hz
- HP: Selects the built in HIGH PASS filter, variable from 10Hz to 1.2kHz
- POWER LED: Indicates the powered up and turned on condition
- PROTECTION LED: Indicates a high voltage, low voltage, short circuit,
hard clip, over heating or DC fault condition.
- MODE: “2CH” indicates one set of RCA’s are being used. This will also pass signal to channels 3/4 through 1/2 inputs.
“4CH” indicates connecting 2 sets of RCA’s to 1/2 and
3/4 inputs.
- LINE OUTPUT: Full range RCA pass through.
4 Channel Full Range Stereo:
Control checklist:
Interconnect cable checklist:
- Refer to the section “Settings for Best Performance”
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Switch setting checklist:
Minimum final loudspeaker impedances:
- 1/2CH X-OVER: FULL
- 2 ohm per channel.
- 3/4CH X-OVER: FULL
MODE: “4CH” since 2 sets of RCA’s are connected.
Important: Do not be tempted to connect the hot, or positive outputs, from any source together
2 or 3 Channel System:
to obtain a mono signal, as this could very well damage the output stage of that source.
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter RCA cable.
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking
- Connect the mono speaker positive terminal to the Ch4 +, and its negative terminal to Ch3 - as
advantage of the mono bridging capability of all MB Quart amplifiers. In order to create
shown.
a 2 channel system, simply follow the example to also mono bridge channel pair 1/2.
Interconnect cable checklist:
Switch setting checklist:
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit
- 1/2CH X-OVER: FULL
with good quality RCA cables.
- 3/4CH X-OVER: LP
- A MONO signal source is required to bridge channel pair 3/4, such as would be
Control checklist:
available from the mono sub bass output of an active crossover, whether standalone, or
- Refer to the section “Settings for Best Performance”
built into a head unit or equalizer. If you only have 1 set of RCA outputs from your
Minimum final loudspeaker impedances:
headunit, you can simply connect those to the inputs for ch 1/2 and switch the MODE to
- 2 ohm per channel in stereo mode.
2ch. The amplifier will auto sum the signal and provide mono output for bridged
- 4 ohm mono bridged.
channels 3/4.
POWER INPUT
GND REM BATT+12V
Ch4 Ch3 Ch2 Ch1
- + - + - + - +
BRIDGED BRIDGED
FUSE
STEREO LINE INPUT
MONO LINE INPUT
INPUT MODE X-OVER HIGH PASS LEVEL
LP/BP HP FULL 30Hz 150Hz 0dB 9dB 10Hz 1.2kHz 6V 0.2V
OUTPUT X-OVER LOW PASS BASS EQ HIGH PASS LEVEL INPUT
4CH 2CH DUPE 3/4 HP FULL 10Hz 1.2kHz 6V 0.2V
Ch1 Ch3
Ch2 Ch4
Ch 1&2
Ch 3&4
POWER
PROTECTION
INPUT MODE X-OVER HIGH PASS LEVEL
LP/BP HP FULL 30Hz 150Hz 0dB 9dB 10Hz 1.2kHz 6V 0.2V
OUTPUT X-OVER LOW PASS BASS EQ HIGH PASS LEVEL INPUT
4CH 2CH DUPE 3/4 HP FULL 10Hz 1.2kHz 6V 0.2V
Ch1 Ch3
Ch2 Ch4
POWER
PROTECTION
POWER INPUT
GND REM BATT+12V
Ch4 Ch3 Ch2 Ch1
- + - + - + - +
BRIDGED BRIDGED
FUSE
INPUT MODE X-OVER HIGH PASS LEVEL
LP/BP HP FULL 30Hz 150Hz 0dB 9dB 10Hz 1.2kHz 6V 0.2V
OUTPUT X-OVER LOW PASS BASS EQ HIGH PASS LEVEL INPUT
4CH 2CH DUPE 3/4 HP FULL 10Hz 1.2kHz 6V 0.2V
Ch1 Ch3
Ch2 Ch4
POWER
PROTECTION