Electro-Voice Precision P1250 - User Manual

P1250
Precision Series
TM
Power Amplifier
• Built-in processor ensures
optimum sound quality and
amplifier/speaker matching
• 370 watts per channel
at 8 ohms, 550 watts per
channel at 4 ohms, 650 watts
per channel at 2 ohms
• Compact, two-rack-space chassis
• Neutrik Speakon
®
output
connectors allow use of heavy-
gauge speaker wire for low-
loss connections
• Three-year parts-and-labor
warranty
SPECIFICATIONS
Conditions:
1. 0 dBu = 0.775 V rms.
2. Dual-mode ratings are for each channel,
both operating, unless noted.
3. 120-volt ac line voltage maintained
throughout testing.
Continuous Rated Output Power
(20-20,000 Hz at less than 0.1% THD,
both channels driven per EIA RS-490),
Dual Mode, 2 Ohms:
600 watts
Bridged Mode, 4 Ohms:
1,200 watts
Dual Mode, 4 Ohms:
500 watts
Bridged Mode, 8 Ohms:
1,000 watts
Dual Mode, 8 Ohms:
350 watts
Continuous Rated Output Power (1 kHz,
1% THD, both channels driven per EIA
RS-490),
Dual Mode, 2 Ohms:
650 watts
Bridged Mode, 4 Ohms:
1,300 watts
Dual Mode, 4 Ohms:
550 watts
Bridged Mode, 8 Ohms:
1,100 watts
Dual Mode, 8 Ohms:
370 watts
Power Bandwidth
(+0, –1 dB, reference 1 kHz),
Dual Mode, 4 Ohms:
20-20,000 Hz
Bridged Mode, 8 Ohms:
20-20,000 Hz
Dual Mode, 8 Ohms:
20-20,000 Hz
Frequency Response
(–1 dB, reference 1 kHz/1 watt):
10-30,000 Hz
Voltage Gain, 1 kHz, Input Level Controls
Full Clockwise, Constant-Gain Option:
1
26 dB
Input Sensitivity, 1 kHz, Dual Mode for 550
Watts into 4 Ohms:
0 dBu (775 mV)
Maximum Input Level, 1 kHz:
+20 dBu (7.75 V)
Input Impedance (per channel,
20-20,000 Hz), Balanced:
20 kilohms
Phase Response (at rated power, any
mode, 10-30,000 Hz):
±22.5 degrees
THD Plus Noise at 1 kHz (at rated power,
measurement bandwidth 80 kHz):
<0.01%
IMD (SMPTE) (60 Hz/7 kHz, typical, at
rated power; see Figure 2):
<0.01%
Rise Time (10% to 90% at rated power,
any mode):
<2.5 microseconds
Slew Rate, Any Mode:
>30 V/microsecond
Damping Factor, Any Mode:
>300
Amplifier Protection:
Excessive output voltage; shorted loads;
excessive phase shift; rf interference;
overtemperature; excessive back EMF;
In-rush current limiter
Load Protection:
Start-up/shutdown transients; dc fault;
infrasonic signals; low ac line voltage;
nonlinear signal limiter
Output Topology:
True complementary symmetry with
ungrounded collectors (no mica insulators
means better heat transfer)
Output Devices,
Total Number: 20 devices
P
d
(max) Rating: 250 watts
I
c
(collector current): 16 amps dc
T
j
(max): 200 °C (392 °F)
Controls and Switches,
Rear (see Figure 3):
Limiter Time Constant (Fast/Slow);
Processor(LPN/B6/Off); Pole
Frequency—low-pass notch (60 Hz,
43 Hz, 26 Hz); Bridged Mode switch
(Bridged/Normal); Hi-Lo-Cut Filter
(15 Hz/31 Hz/Off); Input Routing
(Parallel Mono/Dual Stereo);Circuit ⊥
To Chassis Switch (Grounded/
Ungrounded);
Front (see Figure 3):
Two calibrated input level controls;
power switch
Front-Panel Indicators:
Six LED’s per channel (12 total) for power
on, input signal; output signal; limiter
on; protection on and processor on
Connections,
Input:
3-pin female XLR-type connectors for
each channel in parallel with a 3-pin
male XLR-type output connector for
easy signal routing; the XLR connec-
tors are wired according to the IEC 268
standard: pin 1 shield, pin 2 positive,
pin 3 negative
Output:
Neutrik Speakon
®
NL4MP for channels
A, B and for bridged mode
Power:
14-gauge, 3-wire, permanently attached
power cable
_______________
1. Configured for constant-gain option, all Precision Series
TM
amplifiers, regardless of power rating, have a maximum
voltage gain of 26 dB.

Summary

P1250 Amplifier Specifications

Continuous Rated Output Power

Dual and bridged mode power output ratings at specified THD.

Frequency Response and Gain

Amplifier frequency response, voltage gain, and input sensitivity.

Signal Integrity and Protection

THD, IMD, rise time, slew rate, damping factor, and protection circuits.

Output Topology and Devices

Description of output circuit design and power device specifications.

Controls and Switches Overview

Details on front and rear panel controls, indicators, and connections.

Amplifier Description and Features

Processor and DSP Functionality

Built-in processor for sound quality, speaker matching, and protection.

Protection and Limiter Systems

Circuits for overload, overtemperature, shorted outputs, and clipping limiters.

Filtering and Input;Output

High/low-cut filters, XLR inputs, Speakon outputs, and signal routing.

Architects and Engineers Specifications

Core Design and Performance

Dual-channel design, output topology, and key performance metrics.

Protection and Processing Requirements

Mandatory protection circuits and signal processing capabilities.

Control and Connection Standards

Specifications for front/rear panel controls, indicators, and connectors.

Product Warranty and Service Information

Uniform Limited Warranty Details

Coverage for defects, exclusions, and obtaining warranty service.

Service and Repair Contact

Address for product service and repair.

Electro-Voice Precision P1250 Specifications

General

THD	<0.03%
Signal-to-Noise Ratio	>100 dB
Damping Factor	>300
Input Impedance	20 kOhms (balanced), 10 kOhms (unbalanced)
Frequency Response	20 Hz - 20 kHz
Cooling	Variable speed fan
Dimensions	483 x 133 x 394 mm (19 x 5.25 x 15.5 in)