Hafler PRO 2400 Service Manual

Page 1

INSTALLATION

OPERATION

Please refer to this serial
number in all communications
regarding this equipment.

Page 2

SPECIFICATIONS

POWER RATING:
120 watts per channel into 8 Ohms at less than 0.05%
THD from 20Hz to 20kHz with both channels driven.

200 watts per channel into 4 Ohms at less than 0.05%
THD from 20Hz to 20kHz with both channels driven.

400 watts into 8 Ohms (mono bridged) at less than
0.05% THD from 20Hz to 20kHz.

IM DISTORTION (IHF):
Less than 0.005% from 1 to 120 watts. each channel,
into 8 Ohms.

TYPICAL THD AT 120 WATTS INTO 8 OHMS:
20 Hz: 0.003%
1 kHz: 0.002%
20 kHz: 002%

FREQUENCY RESPONSE INTO 8 OHMS:
-3dB, 4Hz to 100kHz at 1 watt.
+0dB, -0.5dB. 10Hz to 40kHz at 120 watts.

SIGNAL TO NOISE RATIO, "A" WEIGHTED:
Exceeds lOOdB referred to 120 watts into 8 Ohms.

INPUT IMPEDANCE:
Unbalanced: 47,000 Ohms.
Balanced: 47.000 Ohms per phase.

INPUT SENSITIVITY for 120 watts into 8 Ohms:
Unbalanced: 2.25 volts RMS
Balanced: 1.125 volts RMS per phase.

DAMPING FACTOR:
300 to lkHz into 8 Ohms. 200 to lOkHz into 8 Ohms.

POWER CONSUMPTION:
9 Amps at 120 watts into 8 Ohms.

SIZE: 5 1/4" high plus 1/2" feet. 19" wide, l0 1/2" deep.

NET WEIGHT: 27 lbs.

ALL SPECIFICATIONS SUBJECT TO CHANGE
WITHOUT NOTICE.

'0 Copyright I993. All rights reserved

INTRODUCTION

The Hafler PR02400 is a two channel medium power audio
amplifier which has been engineered to meet high perfor-
mance and reliability standards while maintaining
affordability.

The amplifier employs a sonically proven circuit topology
driving MOSFET output devices. These devices provide
exceptional reliability as a result of their inherent rugged-
ness and resistance to abusive operating conditions. Con-
sequently. the PR02400 is capable of delivering high
current into low impedance loads, and generally the ampli-
fier will not be damaged in the case of accidental short
circuit at the output. The drive circuitry is a simple and
effective arrangement using high quality components to
ensure longevity and, above all. sonic excellence.

INSTALLATION

VENTILATION

Adequate air flow is important to the continuing reliability
of any power amplifier. Cool air must be able to circulate
freely through the perforations in the cover and under the
chassis, and around the heatsinks. It is expected that the
amplifier will always be resting on its feet. which should be
on a hard enough surface that air flow underneath will not
be obstructed. If the amplifier is mounted in a rack, or
through a panel, the feet may be removed so long as
adequate ventilation is provided through the bottom open-
ings. It is normal for the cover and heatsinks to become
warm during use.

MOUNTING

The front panel is designed to fit a standard 19" rack at 5.25"
intervals or alternatively the unit may be stacked. The feet
may also be removed if desired when rack mounting.

LINE CONNECTIONS AND SWITCHING

The PRO2400 is normally wired for use on 120V AC power
lines, as in the USA. If your line voltage is different,
alternate connections are available inside the amplifier for
100, 120, and 230 VAC. Consult the schematic and/or the
factory. Units wired for 230 VAC may be operated over a
range of 220-240 VAC with no compromise in safety or
performance. Be sure your amplifier is wired for your line
voltage before you plug it in.

The PR02400s power switch may be left on. and the
amplifier switched remotely by connecting its line cord to
a pre-amplifier (or other control center) which provides a
switched 3-way AC outlet. Make sure that the control
device can supply acurrent of 10 Amperes to the PR02400.
in addition to the current required by any other switched
units. You may instead connect the amplifier directly to a
wall outlet and control it with its own front panel power
switch.