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HOME 음향장비PPA
1200 |
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The PPA 1200 is a sophisticated, reliable class AB
power amplifier with microprocessor control for all
functions. Fitted with dual power supplies, it delivers
2 x 600 W in 4 W or 2 x 900 W in 2 W with superb sonic
quality, for an unlimited
period. In bride mode, it delivers 1200 W in 8 W or
1800 W in 4 W RMS.
A built-in two-way electronic 24 dB/oct. Bessel crossover
can be activated to suit Bi-amping of many speaker systems.
Crossover frequency is fixed at 1 kHz, which is the
optimum for use with SA Compact Drivers. Other frequencies
are available on request. |
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Microprocessor
control
For total flexibility, a microprocessor is used to achieve the following:
Control of all functions like input levels, maximum power,
power amp on delay, input ground lift, system ground lift,
stand-by and bridge mode. |
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Display of values of all relevant internal parameters, like
output transistor temperature, average power, peak power,
maximum power, power amp on delay, DC on output and overheating.
LED indication for signal present, clip and power limit and
selected display status. |
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Protection of the amplifier and loudspeakers. |
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Full remote control of up to 250 PPA 1200 amplifiers through
the SAnet, by any PC, fitted with the SAnet card. |
Store and recall PC generated presets of all settings.
Presets for SA's loudspeaker systems are already stored in
memory. |
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Integrated "logging" software enables rental companies
to establish exactly when amps have been used, for how long,
at what levels, etc. |
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A system lock, with programmable lockcode, is added to prevent
unauthorised alteration of any setting. |
Dynamic Damping Control™
DDC comprises special circuitry that measures the voltage on the
loudspeaker terminals by means of extra sensor wiring. These measurements
are compared with the amplifier's input signal and, if discrepancies
are registered, corrections are made. This ensures that the amplifier
has an almost infinite damping, resulting in an exceptionally accurate
sound reproduction.
Auto Energy Control (AEC™)
AEC is a very sophisticated protection against clipping, average
power overload and peak power overload, designed to maintain the
full dynamic range of the program material.
The microprocessor continuously measures output voltages and currents
of the amplifiers, when limits are exeeded, the input gain is reduced
proportionally to the amount of overload.
Once the overloading has disappeared, the gain is automatically
restored to its original value.
Attack and release time depend on the type of overload and are selected
to guarantee an inaudible operation.
Wiring for DDC™
For absolute top quality sound reproduction, the PPA 1200 is equipped
with Dynamic Damping Control™.
The DDC™ system is based on 2 loudspeaker wires that return
from the speaker to the (SA) amplifier.
The picture on the right shows the wiring of 4-pole and 8-pole Speakon
connectors in combination with the DDC™ system. |
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| Frequency
response |
10 Hz - 60 kHz, (300 W/ 8W , +0, - 3 dB) |
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| Input sensitivity |
+6 dBu for specified output (49 V/ 4 W load) |
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| Input impedance |
20 kW, (each leg) |
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| Output power
(RMS / Peak) |
2 x 350 / 350 W in 8 W, 20 Hz - 20 kHz
2 x 600 / 700 W in 4 W, 20 Hz - 20 kHz
2 x 900 / 1400 W in 2 W, 20 Hz - 20 kHz
1200 / 1400 W in 8 W, bridge mode
1800 / 2800 W in 4 W, bridge mode |
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| S/N ratio |
> 105 dB, 20 Hz - 20 kHz |
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| Common mode rejection
ratio |
> 65 dB at 1 kHz; > 55 dB at 20 kHz |
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| Channel separation |
> 90 dB at 1 kHz; > 80 dB at 20 kHz |
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| THD (300 W /
8 Ohms) |
< 0.005 % at 1 kHz; < 0,01% at 20 kHz |
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| IMD |
< 0,01 %, 300 W / 8 W, 20 Hz - 20 kHz |
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| Slew rate |
> 40 V/μs |
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| Damping factor
(with DDC) |
10,000 at 1 kHz; 3,000 at 10 kHz |
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| Housing |
19 in. rack mount, 4 HU high, 375 mm (14.8 in.) deep |
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| Physical dimensions
(h x w x d) |
176 x 483 x 375 mm (6.9 x 19.0 x 14.8 in.) |
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| Weight |
34 kg (75 lb) |
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