Electro-Voice Precision P3000 Specifications page 3

Operating Voltage:
120 V, 60 Hz ac
Power Consumption (both channels
1
operating in dual mode, / power),
8
4 Ohms:
1,200 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:
28 kg (61.6 lb)
Shipping Weight:
32.7 kg (72 lb)
DESCRIPTION
The Electro-Voice P3000 Linear Precision
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 P3000 delivers more than
750 watts continuous average power into
8 ohms, 1,200 watts into 4 ohms and 1,500
watts into 2 ohms over the full audio frequency
range. In the bridge mode, the amplifier can
deliver more than 2,800 watts into 8 ohms and
3,600 watts into 4 ohms at less than 1% THD.
The power supply, with its large toroidal trans-
former, gives the amplifier impressive head-
room and current output.
The P3000 contains 48 high-power output de-
vices with 12,000 watts of dissipation capabil-
ity. These devices are protected from overheat-
ing by four, three-speed, temperature-sensitive
fans. The fans are quiet enough to permit use of
the P3000 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
P3000. Among the most novel of these circuits
is the Mirrored Frontend Power Supply Bridge
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
is part of the front end of the amplifier and uses
discrete electrical components instead of inte-
grated circuits to help the P3000 achieve its
phenomenally low distortion.
The P3000 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 P3000 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 P3000 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
TM
switchable on/off for use in applications utiliz-
ing front-end 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 P3000 has electronically balanced XLR-
type input and output connectors that allow
easy, problem-free connections and signal rout-
ing. The P3000 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 P3000 also
has a constant-gain option which allows the
voltage gain to be fixed. This permits different
amplifiers to be used in fixed installations with-
out rebalancing, and ensures headroom is not
wasted.
The P3000'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
P3000 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.
TM
.
Calibrated, detented potentiometers on the front
panel regulate the gain of the P3000. The panel
nomenclature shows the amount of attenuation
accurately.
TM
The P3000 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
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 P3000 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 P3000 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
TM
Precision Series
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, 750 watts into 8 ohms, 1,200 watts
into 4 ohms, 1,500 watts into 2 ohms, 2,400
watts bridged into 8 ohms and 3,000 watts
bridged into 4 ohms; hum and noise, at least
100 dB (A-weighted) below rated output power;
frequency 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
TM am-
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 32.7 kg (72 lb). Color: gray.
power amplifiers.