Mono Modes - Crown MARCO-TECH 5000VZ User Manual

Notes
MA-5000VZ Front Panel
Display Circuitry
ILOAD/ILIMIT LED's flash green with the audio when program material is
being deüvered to a load. Its functíon ¡s similar to that of the SPI, except
that it comes on when the amplifier is loaded, SPI does not require a
load. This is the ILOAD f unction. In the event of current ümiting action the
light will flash to yellow. This ¡s the ILIMIT function.
MONO MODES
The MA-5000VZ has three main
operating modes, namely dual
(stereo), bridge mono, and parallel
mono.
There are a number of precautions
which should be taken when
operatingtheamplifierineithermono
mode. The VZ mode switches for
each channel must be set the same.
Sensitivity, LOI, and Compressor
switches for channel 2 make no
difference. The input must be to
channeM only. The input to channel
2 and conírols for channel 2 are NOT
defeated in either mono mode,
therefor no connection to channel 2
may be made in either mono mode.
The channel 2 level control should be
turned down (counterclockwise) f ully
¡n either mono mode.
Monaural amplifier operating modes are covered in detail in the MA-
5000VZ Owner's Manual. The discussion below primarily aides in
understanding how to the mono modes work for testing purposes.
Bridge Mono
Bridge mono is intended for loads of 4 ohms or greater. The feedback
loop for channel 1 also drives the input to channel 2 in this mono mode.
The input to channel 2 is, however, inverted. This causes the output of
channel 2 ío be of equal magnitude and opposite polarity (for double
voltage output) the output of the amplifier is balanced, and channel hot
output is connected to load hot (+), channel 2 hot output is connected
to load return (-).
Parallel Mono
Parallel mono is intended for loads less than 4 ohms (as Iow as 1 ohm)
¡n a monaural amplifier configuration. The channeM and 2 amplifier hot
outputs must be shorted by an external shorting buss (10 AWG or
larger). The amplifier output to the load(s) is taken f rom either channel's
hot output to load hot, and either channel's negative output to the load
return (-). The shorting buss must be removed prior to changing from
parallel mono to either other mode.
30 - MA-5000VZ