Mb-quart REF4.50 User Manual download pdf (Page 6)

4-Channel Amplifiers

REF4.50 / REF4.80

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

- 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:

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: “4” since 2 sets of RCA’s are connected.

2 or 3 Channel System:

- 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 Ch3 +, and its negative terminal to Ch4 - 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: LOW (LOW PASS)

- 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.

Minimum final loudspeaker impedances:

Important: Do not be tempted to connect the hot, or positive outputs, from any source

- 2 ohm per channel in stereo mode.

together to obtain a mono signal, as this could very well damage the output stage of

- 4 ohm mono bridged.

that source.

OUT

Ch3

Ch1

Ch4

Ch2

INPUT

LEVEL

6V 0.2V

15Hz 250Hz

FULL HIGH CLONE

FULL HIGH LOW

(Ch3/4)

HIGHPASS

30Hz 250Hz

LOWPASS

6V 0.2V

LEVEL

0dB 9dB

BASS

BOOST

15Hz 250Hz

HIGHPASS

POWER

PROTECTION

MODE

Ch1/2 Ch3/4

POWER INPUT

GND REM BATT+12V

SPEAKER OUTPUT

Ch1 Ch2

Ch3 Ch4

- + - + - + - +

BRIDGED BRIDGED

SPEAKER OUTPUT

Ch1 Ch2

Ch3 Ch4

- + - + - + - +

BRIDGED BRIDGED

FUSE

OUT

Ch3

Ch1

Ch4

Ch2

INPUT

LEVEL

6V 0.2V

15Hz 250Hz

FULL HIGH CLONE

FULL HIGH LOW

(Ch3/4)

HIGHPASS

30Hz 250Hz

LOWPASS

6V 0.2V

LEVEL

0dB 9dB

BASS

BOOST

15Hz 250Hz

HIGHPASS

POWER

PROTECTION

MODE

Ch1/2 Ch3/4

POWER INPUT

GND REM BATT+12V

FUSE

STEREO LINE INPUT

MONO LINE INPUT

OUT

Ch3

Ch1

Ch4

Ch2

INPUT

LEVEL

6V 0.2V

15Hz 250Hz

FULL HIGH CLONE

FULL HIGH LOW

(Ch3/4)

HIGHPASS

30Hz 250Hz

LOWPASS

6V 0.2V

LEVEL

0dB 9dB

BASS

BOOST

15Hz 250Hz

HIGHPASS

POWER

PROTECTION

MODE

Ch1/2 Ch3/4

1 2 3 4 5 6 7 8 9 10 11

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Mb-quart REF4.50 User Manual Page 6

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