MB QUART Reference Amplifiers - Manual (Page 7)

4-Channel Amplifiers
RA480.4 / RA640.4 / RA1000.4
6
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.
(If only 1 set of RCA’s are available, feed them to Inputs
1&2 and switch MODE to 2. This will internally route signal
to channels 3&4.)
Control checklist:
- Refer to the section “Settings for Best Performance”
Minimum final loudspeaker impedances:
- 2-Ohms per channel.
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 suggested 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. If you only have 1 set of RCA
outputs from your headunit, you can simply connect those
to the inputs for ch 1&2 and switch the MODE to 2.
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.
- Connect the mono speaker positive terminal to the CH3&4
Left +, and its negative terminal to CH3&4 Right - as shown.
Switch setting checklist:
- 1/2CH X-OVER: FULL
- 3/4CH X-OVER: LPF
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.
FULL RANGE
SPEAKERS
FULL RANGE
SPEAKERS
FULL RANGE
STEREO LINE
INPUTS
FULL RANGE
STEREO LINE
INPUTS
MONO INPUT
CHASSIS GROUND
CHASSIS GROUND
REMOTE TURN-ON
REMOTE TURN-ON
TO BATTERY +12V
VIA FUSE
TO BATTERY +12V
VIA FUSE
SUBWOOFER