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.
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