Dynacord PowerMate 2200 Mode D'emploi page 49

MASTER
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 chan-
nel 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 au-
dience, and the equipment from unnecessary stress.
POWER AMPLIFIER
The PowerMate's PROCESSED PRECISION stereo po-
wer amplifi er'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 par-
alleled 8 ohm loudspeakers connected to each channel.
Their low distortion rate and inter-modulation provide the
amplifi ers of the PowerMate with outstanding transmission
capabilities that do not have to fear the comparison with
professional high-end, stand-alone audio power amplifi ers.
The amplifi er is also designed to live through the hard wea-
ring 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 Power-
Mate 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 sys-
tems against overload and clipping. Even when the maximum
input level is overridden, no distortion is heard on the output.
The amplifi er also incorporates LPN-fi lters. Together with the
12dB/70Hz LO-CUT fi lters, the Low Pass Notch fi lters elimi-
nate transient response faults of typical sound reinforcement
speaker systems and provide your setup with an extraordi-
narily precise and powerful reproduction of low frequencies.
49