59. PFL MASTER
Engaging the master PFL-button, the PRE FADER stereo master signal is
routed to the headphones output. The volume of this signal is not affected
by the setting of the MASTER faders.
60. MASTER L + R
Level controls to adjust the output signals of the left and right main outputs
(MASTER).
Please, make sure that the corresponding input channel fader or at
least the master faders are set to their minimal position or the
STANDBY switch is engaged, before connecting an external sound
source to an input of the PowerMate. This will save you, your audience,
and the equipment from unnecessary stress.
POWER AMPLIFIER
The PowerMate’s PROCESSED PRECISION stereo power amplifier’s
design uses bipolar technology to provide a nominal output power of 500
watts resp. 700 watts at 4 ohms per channel. The minimal load impedance
of 2.7 ohms allows the operation with a maximum of three paralleled 8 ohm
loudspeakers connected to each channel. Their low distortion rate and
inter-modulation provide the amplifiers of the PowerMate with outstanding
transmission capabilities that do not have to fear the comparison with
professional high-end, stand-alone audio power amplifiers.
The amplifier is also designed to live through the hard wearing use of the
touring operation. It incorporates protection circuitry against thermal and
capacitive overload and short circuit as well as against HF-interferences or
the occurrence of DC at the outputs. Further protection against back-feed
of electrical energy is provided by a special circuit. When the PowerMate
is switched on, a relay controls the delayed switching of the power outputs.
The internal ventilators run shortly on full speed, signaling acoustically that
the PowerMate is operational. A limiter controls the initial current inrush,
preventing the mains fuse from being blown during power-on.
The extensive comparator circuitry constantly monitors the input and output
signals and activates the internal limiters whenever a non-linear operational
state is encountered. This provides reliable protection of the connected
loudspeaker systems against overload and clipping. Even when the maxi-
mum input level is overridden, no distortion is heard on the output. The
amplifier also incorporates LPN-filters (DYNACORD patent). Together with
the 12dB/70Hz LO-CUT filters, the Low Pass Notch filters eliminate transi-
ent response faults of typical sound reinforcement speaker systems and
provide your setup with an extraordinarily precise and powerful reproduction
of low frequencies.
MASTER
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