Features
The MA247 sets a new standard as a professional 6 zone PA
mixing amplifier/preamplifier for commercial and industrial
applications, either as a standalone unit or as the central device in
an expandable, simple but clever paging system. The amplifier is
equipped with 4 balanced mic/line inputs, each with adjustable gain
and tone controls, up to 4 line level inputs and an emergency input.
The MA247 has a six level priority system. The emergency/
telephone input has the highest priority and is activated by a
switch or vox circuitry. Its signal goes directly to the main amplifier,
bypassing any level control accessible at the front of the unit. An
attenuator next to the input sets its level. Micro¬phone input 1 has
the second priority level, followed by the mic 2, 3 and 4 and finally
the line signals (music).
Zones 2 to 6 can be volume controlled individually. Please note
that zones number 5 and 6 are 70 Volt outputs, these are
compatible with 100 Volt speakers, but by nature, these outputs
will have a slightly reduced output level, meant for the ‘quiet’
zones in a multizone system. For even more flexibility, zone 1 is an
independent zone with a separate line level output, which turns
the MA247 into a true 2 zone mixing amplifier with integrated
preamplifier. During paging, the corresponding integrated volume
control will be automatically bypassed. When priority has been
activated in any zone, the internal 24VDC supply output (max
0.6A) can activate priority relays of loudspeaker attenuators or
other devices. There is a dedicated 24V output per zone! Even an
emergency 24 VDC supply input is present on the unit. The supply
will automatically keep the amplifier powered when mains power is
interrupted. Mic input 1 is optimized to be used with our MICPAT-6,
a selective paging station 6 zone microphone.
This mic is the master mic. Maximum 5 of these mics can
