Electro-Voice P2000 - Manual (Page 3)

Operating Voltage:
120 V, 60 Hz ac
Power Consumption (both channels
operating in dual mode,
1 / 8 power),
4 Ohms:
800 VA
Dimensions, (See Figure 1)
Height:
132.5 mm (5.25 in.)
Width:
483 mm (19.0 in.)
Depth:
426 mm (16.8 in.)
Color:
Gray
Net Weight:
26 kg (57.2 lb)
Shipping Weight:
30 kg (66 lb)
DESCRIPTION
The Electro-Voice P2000 Precision Series
TM
amplifier is a very-high-quality power amplifier
designed to elicit maximum performance from
any speaker system. Its ultralow distortion and
powerful amplifiers ensure that program mate-
rial will be amplified very accurately.
Each channel of the P2000 delivers more than
500 watts continuous average power into
8 ohms, 800 watts into 4 ohms and 1,000 watts
into 2 ohms over the full audio frequency range.
In the bridge mode, the amplifier can deliver
more than 1,600 watts into 8 ohms and 2,000
watts into 4 ohms at less than 1% THD. The
power supply, with its large toroidal transformer,
gives the amplifier impressive headroom and
current output.
The P2000 contains 32 high-power output de-
vices with 8,000 watts of dissipation capability.
These devices are protected from overheating
by four, three-speed, temperature-sensitive
fans. The fans are quiet enough to permit use of
the P2000 in noise-sensitive applications such
as recording studios and houses of worship.
The output devices are mounted to a massive,
extruded-aluminum heat sink that is engineered
to minimize thermal gradients and allow the
amplifier to operate safely into low-impedance
loads. The output devices have a maximum
junction temperature of 200 °C (392 °F), so high
operational temperatures present no problems.
The output devices are mounted directly to the
heat sink without mica insulators to ensure
better dissipation of heat.
Many electronic circuit innovations exist in the
P2000. Among the most novel of these circuits
is the Mirrored Frontend Power Supply Bridge
TM .
This design ensures complete symmetry for
each bridged amplifier and both signal polari-
ties, and eliminates asymmetrical rise and fall
times. The Dual Differential Discrete Topology
TM
is part of the front end of the amplifier and uses
discrete electrical components instead of inte-
grated circuits to help the P2000 achieve its
phenomenally low distortion.
The P2000 has sophisticated protection cir-
cuits that guard it and the load from problems.
Protection circuits guard against overload,
overtemperature, shorted outputs, radio-fre-
quency interference and dc faults. The output
devices are protected against damage from
reverse feeding of electrical energy (back EMF)
and are switched on via relays to avoid tran-
sients which could damage speakers.
The P2000 has built-in limiters to protect speak-
ers from the deleterious effects of amplifier
clipping. The limiter’s action is governed by
very sophisticated input/output comparators
which have acoustically optimized time con-
stants to preserve the integrity of the source.
The limiter’s time constants are switchable fast/
slow, so the limiter may be matched to the
application for which the amplifier is being
used.
The P2000 has built-in switchable high- and
low-cut filters. These filters attenuate infrasonic
and ultrahigh-frequency signals, preventing
them from being amplified; this allows more
effective use of the amplifier’s power and adds
a measure of load protection. These filters are
switchable on/off for use in applications utiliz-
ing frontend units (like crossovers or equaliz-
ers) which have these filters built-in.
A multifunction display keeps the user informed
of the operating status of the amplifier. Sepa-
rate LED displays for each channel show power
on, input signal, output signal, limiter on and
protection active.
The P2000 has electronically balanced XLR-
type input and output connectors that allow
easy, problem-free connections and signal
routing. The P2000 has an input routing switch
that allows selection of either normal dual-
channel operation, or parallel mono operation,
which routes an input to both channels but still
allows for independent level control. The P2000
also has a constant-gain option which allows
the voltage gain to be fixed. This permits differ-
ent amplifiers to be used in fixed installations
without rebalancing, and ensures headroom is
not wasted.
The P2000’s professional Neutrik Speakon ®
output connectors provide a sturdy, reliable
connection and allow use of heavy wire for loss-
free signal transmission. There are separate
output connectors for channels A and B, and for
the bridge mode. The bridge-mode connector is
sealed with a plastic cover to prevent connec-
tion errors.
To prevent ground loops from occurring, the
P2000 is equipped with a ground-lift switch.
When the amplifier is operated in a rack with
units of different ground potential, the switch
may be adjusted to eliminate hum.
Calibrated, detented potentiometers on the front
panel regulate the gain of the P2000. The panel
nomenclature shows the amount of attenuation
accurately.
The P2000 also has a constant-gain option
which, with input level controls full clockwise,
provides a 26-dB voltage gain that is identical to
that of all Electro-Voice Precision Series
TM am-
plifiers in the constant-gain option, regardless
of power rating. This makes it possible to ex-
change amplifiers of different power ratings
without upsetting delivered sound pressure lev-
els or spectral balances.
The Electro-Voice P2000 is the choice for seri-
ous, professional amplification applications
which require optimum sound quality, speaker
protection, and the highest level of construction
quality and long-term reliability.
Figure 3 shows P2000 front and rear panels.
The block diagram is shown in Figure 4.
ARCHITECTS’ AND ENGINEERS’
SPECIFICATIONS
The power amplifier shall be a dual-channel
model of solid-state design employing high-
power output devices in a true-complementary-
symmetry output circuit. It shall be capable of
operating from a 120/200/220/240-V, 50/60-Hz
ac line. The power amplifier shall contain a
modern limiter circuit with switchable time con-
stants to protect the load from damage by
amplifier clipping.
The amplifier shall contain sensing circuitry to
provide protection for the output transistors
against overtemperature, excessive output
voltage, radio-frequency interference, shorted
loads, excessive phase shift and back-EMF
current. The load shall be similarly protected
against infrasonic signals, start-up/shutdown
transients, low ac line voltage and dc.
Rear-mounted panel controls shall include an
input routing switch for selecting dual/stereo or
parallel mono operation, a switch for turning the
infrasonic and ultrasonic filters on or off, a
switch for selecting dual/stereo or bridged op-
eration and a switch for selecting fast or slow
speed for the built-in limiters. Input connections
for each channel shall include a 3-pin female
XLR-type connector wired in parallel with a
male 3-pin XLR output connector for signal
routing. Output connectors shall be Neutrik
Speakon
® NL4MP’s for channels A and B, and
for bridged operation.
Front-panel indicators shall include power on,
input present, output, limit and protect LED’s for
each channel. Front-panel controls shall include
a power switch and level controls that shall be
calibrated, detented potentiometers and have
accurate markings. The amplifier shall have a
constant-gain option that, with input level con-
trols full clockwise, provides a 26-dB voltage
gain that is identical to that of all Electro-Voice
Precision Series
TM power amplifiers.
The power amplifier shall meet the following
performance specifications: maximum input
voltage, 7.75 V rms; rated output power from
20-20,000 Hz at less than 0.1% THD, each
channel, 500 watts into 8 ohms, 800 watts into
4 ohms, 1,000 watts into 2 ohms, 1,600 watts
bridged into 8 ohms and 2,000 watts bridged
into 4 ohms; hum and noise, at least 100 dB
(A weighted) below rated output power; fre-
quency response, 10-30,000 Hz (+0, –3 dB) at
any output power up to rated output power;
damping factor, >300 at any frequency up to 1
kHz in any mode with an 8-ohm load; THD (total
harmonic distortion), <0.05% at 1 kHz at rated
power; transient intermodulation distortion (DIN
30 or DIN 100), <0.01%; crosstalk, <70 dB
below rated output power. Dimensions shall be
132.5 mm (5.25 in.) x 483 mm (19.0 in.) x 426
mm (16.8 in.) hwd. Net weight shall be 30 kg (66
lb). Color: gray.