FX4.50 / FX4.70 / FX4.100
4-Channel Amplifiers
FEATURES:
-2 Sets of RCA inputs
-LEVEL: Variable sensitivity from 0.2V to 6V
-BASS EQ: Adjustable 45Hz bass boost from 0dB to 9dB
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-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
OUTPUT | LOW PASS | BASS EQ | Ch 3&4 | HIGH PASS |
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| Ch3 | |
| LP/BP HP FULL | 30Hz | 150Hz | 0dB | 9dB | 10Hz | 1.2kHz | 6V | 0.2V |
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| INPUT MODE |
| HIGH PASS |
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| PROTECTION |
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| POWER | 4CH | 2CH | DUPE 3/4 HP | FULL | 10Hz | 1.2kHz | 6V | 0.2V |
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-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:
Interconnect cable checklist:
-Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables. Switch setting checklist:
-1/2CH X-OVER: FULL
-3/4CH X-OVER: FULL
MODE: “4CH” since 2 sets of RCA’s are connected.
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POWER | PROTECTION | LP/BP HP FULL | ||
4CH 2CH | INPUT MODE | 30Hz 150Hz | LOW PASS | |
DUPE 3/4 HP | 0dB | BASS EQ | ||
FULL |
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10Hz | HIGH | 10Hz | HIGH | |
1.2kHz | PASS | 1.2kHz | PASS | |
6V | LEVEL | 6V | LEVEL | |
0.2V | 0.2V | |||
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Ch2 |
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Ch4 |
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Control checklist:
- Refer to the section “Settings for Best Performance”
Minimum final loudspeaker impedances: - 2 ohm per channel.
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POWER INPUT |
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| GND REM BATT+12V |
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2 or 3 Channel System:
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking advantage of the mono bridging capability of all MB Quart amplifiers. In order to create a 2 channel system, simply follow the example to also mono bridge channel pair 1/2. Interconnect cable checklist:
-Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit with good quality RCA cables.
-A MONO signal source is required to bridge channel pair 3/4, such as would be available from the mono sub bass output of an active crossover, whether 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 1/2 and switch the MODE to 2ch. The amplifier will auto sum the signal and provide mono output for bridged channels 3/4.
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 output stage of that source.
-It is necessary to feed the SAME signal to both left and right inputs via a
-Connect the mono speaker positive terminal to the Ch4 +, and its negative terminal to Ch3 - as shown.
Switch setting checklist:
-1/2CH X-OVER: FULL
-3/4CH
-Refer to the section “Settings for Best Performance” Minimum final loudspeaker impedances:
-2 ohm per channel in stereo mode.
-4 ohm mono bridged.
STEREO LINE INPUT
MONO LINE INPUT 
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| OUTPUT | |
POWER | PROTECTION | LP/BP HP FULL | ||
4CH 2CH | INPUT MODE | 30Hz 150Hz | LOW PASS | |
DUPE 3/4 HP | 0dB | BASS EQ | ||
FULL |
| 9dB |
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10Hz | HIGH | 10Hz | HIGH | |
1.2kHz | PASS | 1.2kHz | PASS | |
6V | LEVEL | 6V | LEVEL | |
0.2V | 0.2V | |||
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Ch2 |
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Ch4 |
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POWER INPUT |
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| GND REM BATT+12V |
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