REF4.50 / REF4.80
4-Channel Amplifiers
FEATURES:
-2 Sets of RCA inputs
-LEVEL: Variable sensitivity from 0.2V to 6V
-BASS BOOST: Adjustable 45Hz bass boost from 0dB to 9dB
-Crossover functions
-FULL: Bypasses all crossovers for full frequency operation
-HIGH: Selects the built in HIGHPASS filter, variable from 15Hz to 250Hz
-CLONE (Ch3/4): Will automatically duplicate the settings on Ch3/4 for Ch1/2
INPUT |
| Ch1/2 |
| LEVEL |
| Ch3/4 | LOWPASS | BASS | OUT | ||||
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| LEVEL | HIGHPASS | HIGHPASS |
| BOOST | POWER | ||||||
Ch4 | Ch2 |
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| 6V | 0.2V | 15Hz | 250Hz | 6V |
| 0.2V 15Hz | 250Hz | 30Hz | 250Hz 0dB | 9dB PROTECTION | ||
Ch3 | Ch1 |
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| 4 | 2 |
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| FULL | HIGH CLONE |
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| LOW |
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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: “2” indicates one set of RCA’s are being used. This will also pass signal to channels 3/4 through 1/2 inputs. “3” indicates bridging channels 3/4 while running 1/2 in stereo. “4” 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: “4” since 2 sets of RCA’s are connected.
| Ch3 | Ch4 |
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| INPUT |
| 6V | LEVELHIGHPASS |
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FULL HIGH CLONE (Ch3/4) | 0.2V 15Hz 250Hz | Ch1/2 | |
| 6V |
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MODE | 4 2 | LEVEL |
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FULL HIGH LOW | 15Hz 250Hz 30Hz 250Hz | HIGHPASSLOWPASS | Ch3/4 |
| 0dB | BOOST | BASS |
| 9dB |
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| PROTECTION | POWER | OUT |
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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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OUTPUT |
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SPEAKER |
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FUSE |
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| GND REM BATT+12V |
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POWER INPUT |
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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.
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 Ch3 +, and its negative terminal to Ch4 - as shown.
Switch setting checklist:
-1/2CH X-OVER: FULL
-3/4CH X-OVER: LOW (LOW PASS) Control checklist:
-Refer to the section “Settings for Best Performance” Minimum final loudspeaker impedances:
-2 ohm per channel in stereo mode.
-4 ohm mono bridged.
MONO LINE INPUT
STEREO LINE INPUT
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| INPUT |
| 6V | LEVELHIGHPASS |
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FULL HIGH CLONE (Ch3/4) | 0.2V 15Hz 250Hz | Ch1/2 | |
| 6V |
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MODE | 4 2 | LEVEL |
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| 0.2V |
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FULL HIGH LOW | 15Hz 250Hz 30Hz 250Hz | HIGHPASSLOWPASS | Ch3/4 |
| 0dB | BOOST | BASS |
| 9dB |
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| PROTECTION | POWER | OUT |
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OUTPUT | BRIDGED | + - |
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SPEAKER |
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BRIDGED |
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POWER INPUT |
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| GND REM BATT+12V |
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