MB QUART REF1.800 installation manual REF4.50 / REF4.80, Channel Amplifiers

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

LEVEL

HIGHPASS

HIGHPASS

BOOST

POWER

Ch4

Ch2

6V

0.2V

15Hz

250Hz

6V

0.2V 15Hz

250Hz

30Hz

250Hz 0dB

9dB PROTECTION

Ch3

Ch1

4

2

FULL

HIGH CLONE

FULL HIGH

LOW

MODE

(Ch3/4)

-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
			INPUT
	6V	LEVELHIGHPASS
FULL HIGH CLONE (Ch3/4)	0.2V 15Hz 250Hz		Ch1/2
	6V
MODE	4 2	LEVEL
	0.2V
FULL HIGH LOW	15Hz 250Hz 30Hz 250Hz	HIGHPASSLOWPASS	Ch3/4
	0dB	BOOST	BASS
	9dB
	PROTECTION	POWER	OUT

Control checklist:

- Refer to the section “Settings for Best Performance”

Minimum final loudspeaker impedances: - 2 ohm per channel.

			-
			Ch4
OUTPUT	BRIDGED		+ -
			+Ch3
SPEAKER			-+-Ch2
	BRIDGED
			Ch1
FUSE			+
		GND REM BATT+12V
POWER INPUT

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 Y-adapter RCA cable.

-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

			INPUT
	6V	LEVELHIGHPASS
FULL HIGH CLONE (Ch3/4)	0.2V 15Hz 250Hz		Ch1/2
	6V
MODE	4 2	LEVEL
	0.2V
FULL HIGH LOW	15Hz 250Hz 30Hz 250Hz	HIGHPASSLOWPASS	Ch3/4
	0dB	BOOST	BASS
	9dB
	PROTECTION	POWER	OUT

		-
			Ch4
OUTPUT	BRIDGED	+ -
			+Ch3
SPEAKER			-+-Ch2
	BRIDGED
			Ch1
		+
	FUSE
POWER INPUT		GND REM BATT+12V

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