OPERATION
DIP SWITCH SETTINGS (From left to right)
• If a microphone requires phantom power, move the Mic channel’s corresponding
PHANTOM POWER switch to the up position. This applies 12 volts dc phantom
power to the indicated microphone.
• SOURCE 1 MONO; this switch sums the Right and Left inputs of Source 1 to
mixed dual-mono inputs.
• Mic 2 Priority; when in the up position, all program material on Mic 1 and
Sources 2 and 3 will be “ducked” or muted when a signal is present at Mic 2.
Source 1 is left un-muted.
This function is used for paging.
• Source 1 Priority: when in the up position, Source 2,and 3 will be “ducked” or
muted by the signals at Source 1.
This function is for jukebox priority. With a jukebox connected to Source input 1,
and the Talkover switch 2 on, the other Source input signals such as background
music, will be muted and only the jukebox will be heard.
• MONO / STEREO: When up, the output of the MA2355 is summed to mono.
Either jack can be used as a mono output.
FAULT PROTECTION
The fault protection in the MA2355 limits the current to the output stage. This
mode is entered whenever the output stage is called upon for too much power, it
may also be fooled by impedances lower than four ohms - which may cause the
output stage to overheat and be irreversably damaged.
Since the MA2355 is convection cooled, the unit radiates heat from the front panel
and, depending on the load demand, it may become very hot if drawn upon
heavily.
CONNECTION
Inputs
Connect low impedance microphones to the Mic inputs. If a paging microphone is
being used, connect it to Mic Input 2 so it may be used with the Talk Over function.
Connect source signals such as CD players, cassette players or video players to
the RCA Source Inputs. If a jukebox is being connected, and you want its signal to
mute the other source signals, connect it to Source input 1.
For recording purposes, connect a stereo RCA cable to the Record Out jacks, and
to your recording device.
Amp Inserts
To connect a signal processor to the MA2355 signal(s), use an insert plug, or
cable wired as shown in Fig. 1. This return signal is then sent to the output level
section of the amplifier.
Outputs
Connect speakers (we recommend loads no lower than 8 ohms) to the Outputs of
the MA2355 by pressing in each of the spring-loaded terminals and inserting the
proper wire into the proper terminal i.e.; + = red, - = black.
Connect the MA2355 to a properly grounded AC outlet.
3
4
To Amp Insert
Fig. 1
