Owner's manual

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4-Channel Amplifiers

OA400.4 / OA600.4 / OA800.4

Ch1 Ch3

Ch2 Ch4

INPUT

CH3/4

CH1/2

OUTPUT

DUPE CH3/4 HP FULL

0dB 9dB

BASS EQ

X-OVER

10Hz 1.2KHz

HIGH PASS

6V 0.2V

LEVEL

LP/BP HP FULL

X-OVER

PROTECT

POWER

LOW PASS

30HZ 150hZ

INPUT MODE

4CH 2CH

FEATURES:

- 2 Sets of RCA inputs

- LEVEL: Variable sensitivity from 0.2V to 6V

- X-OVER: Selects internal crossover functions

- FULL: Bypasses all crossovers for full frequency operation

- LP/BP: 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

- DUPE 3/4: Allows CH1/2 to Duplicate the settings on 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.

“4” indicates connecting 2 sets of RCA’s to 1/2 and 3/4 inputs.

- LINE OUTPUT: Full range RCA pass through.

- BASS EQ: Adjustable 45Hz bass boost from 0dB to 9dB

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.

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

2 or 3 Channel System:

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.

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 RIGHT +, and its negative terminal to LEFT

advantage of the mono bridging capability of all MB Quart amplifiers. In order to create

- as 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: LP/BP

- 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. If you only have 1 set of RCA outputs from your

Minimum final loudspeaker impedances:

headunit, you can simply connect those to the inputs for ch 1/2 and switch the MODE to

- 2 ohm per channel in stereo mode.

2ch. The amplifier will auto sum the signal and provide mono output for bridged

- 4 ohm mono bridged.

channels 3/4.

POWER INPUT

GND REM BATT+12V

SPEAKER OUTPUT

CH1 Ch2

CH3 Ch4

- + - + - + - +

BRIDGED

FUSE

STEREO LINE INPUT

MONO LINE INPUT

(Unless using procedure

listed above for 2ch)

Ch1

Ch3

Ch2

Ch4

INPUT

CH3/4

CH1/2

OUTPUT

DUPE CH3/4 HP FULL

0dB 9dB

BASS EQ

X-OVER

10Hz 1.2KHz

HIGH PASS

6V 0.2V

LEVEL

LP/BP HP FULL

X-OVER

PROTECT

POWER

LOW PASS

30HZ 150hZ

INPUT MODE

4CH 2CH