![](/images/new-backgrounds/1221217/2212179x1.webp)
Q4.80 / Q4.150
4-Channel Amplifiers
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
-MULTIPLIER FREQUENCY: X1
-FILTER SLOPE: 12dB
-3/4CH X-OVER: HP-FULL
INPUT MODE: 4CH since 2 sets of RCA’s are connected.
Control checklist:
- Refer to the section “Settings for Best Performance”
Minimum final loudspeaker impedances: - 2 ohm per channel.
CH4 | CH3 |
| INPUT |
CH2 | CH1 |
OUT
CLIP INDICATOR | CLIP INDICATOR | |||
| AMBER- |
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GREEN- | SOFT CLIP | GREEN- |
| SOFT CLIP |
PRE CLIP | RED- | PRE CLIP |
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LEVEL | LEVEL | |||
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9V | 0.2V | 9V |
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BASS BOOST | BASS BOOST | |||
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0dB | 12dB | 0dB |
| 12dB |
MULTIPLIER | BASS FREQUENCY | |||
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FREQUENCY |
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| 30Hz |
| 80Hz |
X15 | X1 | HIGH PASS | ||
FILTER SLOPE |
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6dB | 12dB | 15Hz |
| 1KHz |
CHANNELS 1&2 | CHANNELS 3&4 | |||
HIGH PASS | LOW PASS | |||
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(x1) 20Hz | 300Hz | 40Hz |
| 4.5KHz |
(x15) 300Hz | 4.5KHz | CROSSOVER | ||
CROSSOVER |
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DUPE | ||||
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PROTECT | INPUT MODE | |||
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POWER | 4CH | 2CH | ||
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FUSE |
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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
-MULTIPLIER FREQUENCY: X1
-FILTER SLOPE: 12dB
-3/4CH X-OVER: LP-BP MONO
INPUT MODE: 4CH, Stereo Left and Right to CH1&2 and MONO to CH3&4
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 ![](/images/new-backgrounds/1221217/2212179xi3.webp)
![](/images/new-backgrounds/1221217/2212179xi4.webp)
STEREO LINE INPUT
4
CH4 | CH3 |
| INPUT |
CH2 | CH1 |
OUT
CLIP INDICATOR | CLIP INDICATOR | |||
| AMBER- |
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GREEN- | SOFT CLIP | GREEN- |
| SOFT CLIP |
PRE CLIP | RED- | PRE CLIP |
| RED- |
| HARD CLIP |
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LEVEL | LEVEL | |||
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9V | 0.2V | 9V |
| 0.2V |
BASS BOOST | BASS BOOST | |||
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0dB | 12dB | 0dB |
| 12dB |
MULTIPLIER | BASS FREQUENCY | |||
FREQUENCY |
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| 30Hz |
| 80Hz |
X15 | X1 | HIGH PASS | ||
FILTER SLOPE |
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6dB | 12dB | 15Hz |
| 1KHz |
CHANNELS 1&2 | CHANNELS 3&4 | |||
HIGH PASS | LOW PASS | |||
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(x1) 20Hz | 300Hz | 40Hz |
| 4.5KHz |
(x15) 300Hz | 4.5KHz | CROSSOVER | ||
CROSSOVER |
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DUPE | ||||
(3&4) |
| MONO STEREO | ||
PROTECT | INPUT MODE | |||
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POWER | 4CH | 2CH | ||
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SPEAKER |
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POWER INPUT |
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