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HOME 음향장비ES
20 |
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The Stage Accompany ES 20 is a dual channel, high
efficiency power amplifier and comprises the following
components:
Balanced input stages. |
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Two high efficient amplifiers which deliver each
500 Wrms into 8 Ω, 770 Wrms into 4 Ω and 960 Wrms
into 2 Ω or 610 W peak into 8 Ω, 1000 W peak into
4 Ω, and 1400 W peak into 2 Ω. |
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Advanced protection circuits. |
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The audio inputs and link outputs
are connected internally without electronics. This is done to prevent
any loss of sound quality. With an input impedance of 22 kΩ, it
is possible to connect a maximum of 30 ES 20s to a 600 Ω source
like the SA 1310 graphic equaliser. If more than 30 units need to
be connected to a single source, a separate signal driver must be
used.
The ES 20 is protected against the connection of speaker impedances
less than 2 Ω or even short circuiting of the output. In these cases
the output current is limited but the amplifier keeps working.
The ES 20 has a number of features, including:.
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High efficiency class G operation. |
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Variable speed DC fan. |
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DDC (Dynamic Damping Control). |
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EFN circuit (Extended Function Network) |
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Soft start to reduce power on inrush current. |
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Temperature, DC, HF and short circuit protection. |
Class G operation
The power supply of the ES 20 amplifier produces 2 different supply
levels. Each channel actually consists of two power amplifiers.
One produces the output signal, the other one selects the power
supply voltage. This way, the ES 20 uses the low level supply at
low output power and the high level supply at high output power
which reduces internal dissipation significantly.
DC Fan
The built in DC fan has a continuous variable speed. Its control
circuit monitors the temperature of the output devices and the temperature
of the power supply. The speed of the fan is calculated out of this
information. This system ensures that the fan always runs at optimum
speed and thus produces less noise.
DDC
DDC (Dynamic Damping Control) is a special way of measuring the
cone movement of a loudspeaker. The voltage induced in the voice
coil is sensed and fed back to the amplifier’s feedback circuit.
Hence, a virtually infinite damping is achieved, which results in
an exceptionally tight sound reproduction.
EFN
Through the internal EFN circuit, with plug-in modules, extra functions
can be added to the amplifier, like cross-over, high- low- or band-pass
filtering, equalisation and loudspeaker protection. Special protection
boards are available for all Stage Accompany loudspeaker systems.
The installation of an EFN module needs to be done by an authorized
Stage Accompany service center.
Soft Start
The soft start circuit is active when the ES 20 is turned on. The
mains inrush current, which normally is in excess of 100 A is limited
to a safe value. However, take care not to switch on too many ES
20 amplifiers at the same time, or you risk that the main fuses
of your distribution may trip.
Temperature, DC, HF and Short Circuit
Protection
The amplifier and the loudspeakers are protected against all possible
damages. |
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| Input |
1.76 Vrms (+7 dBu)
(full continuous power into 4 O) |
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| Maximum Input
Level |
+22 dBu |
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| Input Impedance |
22 kO each leg |
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| Common Mode Rejection
Ratio (CMRR) |
> 70 dB @ 20 Hz - 20 kHz |
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| Frequency Range |
10 Hz - 20 kHz, -0.3 dB @ 100 W into 8 O
10 Hz - 70 kHz, -3 dB @ 100 W into 8 O |
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| Gain |
30 dB (31.6x) |
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| Channel Separation |
75 dB @ 1 kHz, 100 W into 8 O
60 dB @ 20 kHz, 100 W into 8 O |
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| Total Harmonic
Distortion (THD) |
< 0.2 % @ 20 Hz - 20 kHz, more than 2 O load at all powers,
1 dB below clipping.
< 0.01 % @ 1 kHz, 100 W into 8 O
< 0.1 % @ 20 kHz, 100 W into 8 O |
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| Intermodulation
Distortion (IMD) |
< 0.1 % @ 200 Hz - 10 kHz,
< 0.3 % @ 10 kHz - 20 kHz
F1 = 70 Hz, 4:1, 100 W into 8 O |
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| Signal to Noise
Ratio |
110 dB A-weighted |
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| Slew Rate |
> 40 V/μs @ 8 Ω |
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| Damping (with
DDC) |
10.000 @ 1 kHz, 10 V across 8 Ω |
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| Continuous Power
Delivered |
2 x 500 W RMS into 8 Ω
2 x 770 W RMS into 4 Ω
2 x 960 W RMS into 2 Ω |
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| Peak Power Delivered |
2 x 610 W into 8 Ω
2 x 1000 W into 4 Ω
2 x 1400 W into 2 Ω |
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| Continuous Bridged
Power Delivered |
1 x 1000 W RMS into 16 Ω
1 x 1540 W RMS into 8 Ω
1 x 1920 W RMS into 4 Ω |
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| Peak Bridged
Power Delivered |
1 x 1220 W into 16 Ω
1 x 2000 W into 8 Ω
1 x 2800 W into 4 Ω |
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| Mains Supply
Voltage |
internally switchable 110-120/220-240 VAC |
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| Power consumption
typical Idle |
50 VA |
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| 1/8 Power, pink
noise @ 2 O |
1400 VA |
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| Weight |
21.4 kg / 47 lb |
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| Housing |
19 in rack mount,
3 HU high, 410 mm (16.1 in) deep behind the mounting surface
(without connectors) |
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| Dimensions (h
x w x d) |
133 x 482 x 415 mm (without connectors and rack handles)
(5.25 x 19.0 x 16.3 in) |
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