Hafler JF2000 Manuel utilisateur

TABLE OF CONTENTS

Introduction

.....................................................

Page

Features ..........................................................

Page

Installation and Setup...................................... Page 2

Special System Configurations ....................... Page 4

Rear Panel ...................................................... Page8

Operation ........................................................ Page 9

LED Displays ................................................... Page 9

Care ................................................................ Page

Troubleshooting .............................................. Page

Specifications

..................................................

Page

Warranty

..........................................................

Page 13

INTRODUCTION

The JF2000 is the first amplifier in the signature series line

of Hafler audio components. In the Hafler tradition, it is hand-

made in America. The signature series embodies Hafler's

philosophy of supplying the same quality music reproduc-

tion of higher priced audio components for less.

FEATURES

Output Section

High Current

Capability

Wide Load

Range

SOAProtection

(Safe

Operating

Area)

Thermal

Protection

The

JF2000

uses 32 MOSFET output devices

16 per

channel

to source the high current and power required.

Each device is rated at 4.0 Amperes continuous drain

current at 100 degrees Celsius.

Each channel can safely produce peak transient output

currents exceeding 50 Amperes. This ensures that mo-

mentary speaker impedance dips and surge current require-

ments are easily supplied.

The JF2000 is fully rated for loads of 4 and 8 Ohms. It is

stable to 2 Ohms. (This means it will operate safely, cleanly

and stably into 2 Ohms, but very high power dissipation may

lead to frequent thermal shutdown.)

The 16 output devices per channel assure operation well

within the MOSFET Safe Operating Area with low imped-

ances and/or reactive loads.

The output devices of the JF2000 are protected by a so-

phisticated analog computing system. The device instanta-

neous temperature is continuously calculated by the com-

puter and compared to a maximum limit. If the limit is

reached, the computer cuts back thte power and lights the

channel’s distortion (red) front panel LED.

A pair of thermistors, one mounted on each heatsink, mea-

sure temperature of the output system. They control fan

speed and provide thermal shutdown in case temperatures

become too high for safe operation. (Thermal shutdown

turns the power lamp red.)

Toroidal

Transformer

Energy Storage

Great Flexibility

Display

Fan Cooling

The fan cooling system is a key to the

JF2000’s

perfor-

mance. The fan is of a very quiet design, with continuous

variable speed control. When the amp is cool, the fan is

off

As the amp is driven harder, the fan gradually turns on and

speeds up only to the extent needed to sustain the power

dissipation needed for the conditions.

The power supply for the JF2000 is based on a 1000 Volt-

Ampere toroidal (donut-shaped) line transformer. We use

the toroid core (which is more expensive than a conventional

square transformer) for its higher efficiency, lower weight,

smaller size, and freedom from stray magnetic fields. The

1000 Volt-Ampere rating indicates that the transformer can

supply power to a load of 1000 Watts continuously.

Energy storage for the power supply consists of two 42,000

Microfarad capacitors. This large energy storage capability

provides a low-impedance source of extremely high current

for surges, musical transients, variations in speaker imped-

ance, and very low frequencies.

Individual channel gain controls match the JF2000 to a wide

range of installations.

Four Output Modes are available to fit almost any require-

ment: Normal Stereo, Stereo plus Bridged Mono, Bridged

Mono, and Dual Mono.

Simple three-LED multicolor display shows amplifier status

including power, signal level, distortion, and thermal condi-

tion.

INSTALLATION AND SETUP

Amplifier

Placement

The JF2000 is designed to be placed on a shelf or other

substantial support. (A rack-mount front panel is available.)

Take care to ensure unimpeded airflow behind the amplifier,

as the intake and exhaust vents are located at the rear. If the

amp is to be placed in an enclosed wall unit or cabinet, it

would be a good idea to allow for fresh air intake and hot air

exhaust venting in the back of the cabinet, especially for

continuous high-output operation.

Power

Connection

Speaker

Connection

Normal Stereo

Connections

The

JF2000 is designed to operate on 120 Volts AC, 60 Hertz

standard U.S. line output) only. Connection is via a standard

3-prong grounded AC plug. If a 3-prong (grounded) outlet is

rot available, the third (ground) wire MUST be grounded to

satisfactory electrical ground using adapters available at

nost hardware stores.

If an extension cord must be used, it will rob power from the

amplifier. Use only the highest qualtiy 3-wire (grounded)

extension

cords, with large wire

(14-Gauge

or larger) to

educe

losses.

Speaker

connectors are heavy-duty

gold-plated

“5-way”

binding posts, spaced for standard banana jack connectors.

They will accept bare stranded wire up to approximately

12-

Gauge. Banana connectors may be more convenient.

For

normal stereo operation leave ALL REAR PANEL

SWITCHES IN. The amplifier’s left channel red binding post

connects to the left positive (+) speaker terminal and the left

black

post goes to the left negative (-) speaker terminal. Wire

the right channel the same. (Refer to Figure 1)

Figure 1

Left

positive (+) terminal (red) to Left Speaker positive (+)

Left

negative (-) terminal (black) to Left Speaker negative (-)

Right

positive (+) terminal (red) to Right Speaker positive (+)

Right

negative (-) terminal (black) to Right Speaker negative (-)

Speaker

Polarity Note Be sure to observe speaker polarity (+ and

leads) through-

out your system. Getting them wrong can result in missing

bass, massive distortion, or blown speakers!

SPECIAL SYSTEM CONFIGURATIONS

Biamplification

Dual Monaural

(Mona)

What

‘PLEASE NOTE: The minimum nominal load impedance for

each

channel of the amplifier is 4ohms. In bridged mode,

each

channel of the amplifier uses half of the nominal load

impedance. Therefore, in bridged/mono mode the minimum

equired load impedance is 8 ohms.

If the speaker system in use is capable of having separate

inputs for the woofer and midrange or tweeters, or if the

system

has a woofer in a separate box and satellite midrange

and

tweeters, then the final sound from the system could be

improved by biamplifying. This means using two amplifers in

normal

stereo mode, each being driven by a dedicated signal

high or low frequency

and loaded by a dedicated driver

high

or low frequency. This allows different power levels to

applied to the high and low frequency drivers of a speaker

system.

(Refer to Figure 2 for proper hook-up.)

Figure 2

Both

channels are driven by the same signal. (In the JF-

2000,

the common signal input is the Left channel input.) In

his mode, both amplifiers are controlled by the left input gain

control

and put out exactly the same kind of signal and

power.

Why

How

Bridged Mono

What is Bridging?

may wish to drive biamplified pairs of speakers with

identical signals if the speakers have internal crossovers.

‘You may wish to drive multiple speakers which would be too

low in impedance if driven together (under 4 Ohms).

Set the INPUT switch to MONO (out). This feeds the right

and left channel power amplifier section from the left input

signal jack. Connect the speakers the same as you would for

standard stereo. Leave all other switches in the standard

position (IN) unless you have other reasons for using them.

(Refer to Figure 3)

Figure 3

Left positive (+) terminal (red) to Left Speaker positive (+)

Left

negative (-) terminal (black) to Left Speaker negative (-)

Right

positive (+) terminal (red) to Right Speaker positive (+)

Right

negative (-) terminal (black) to Right Speaker negative

(-)

“Bridging” an amplifier means using two amplifier channels

to drive a single speaker. Normally, one terminal of the

speaker is driven by an amplifier section, and the other

terminal is grounded (that is, current is returned to the driving

amplifier). When a speaker load is driven by a bridged

amplifier pair, each terminal of the speaker is driven by a

separate amplifier section.

Bridging applies muchmore power to the speaker load than

either amplifier channel would alone.

For an 8-Ohm speaker,

the JF2000

is rated for a minimum output of 200 Watts for a

single channel. For both channels bridged into the same

speaker,

the minimum output would be 600 Watts.

When the application calls for higher power levels than you

can get from the JF2000 in normal stereo, you can use the

bridged mono mode.

USE CAUTION! Most speakers cannot handle the power of

the JF2000 in bridged mono mode.

Typical applications include: driving large (mono) subwoofers,

large power hungry speaker systems, or bi-amp applications

where large amounts of power are required.

In order to use both channels of input to sum the signal to

drive a mono speaker, set the input switch to stereo (IN) and

the output switch to mono (OUT). The amplifier’s left channel

red binding post connect to the positive (+) speaker terminal

and the right channel red binding post connects to the

negative (-) speaker terminal. (Refer to Figure 4)

Figure 4

Bridged Mona

Stereo Plus Stereo satellites can be driven at the same time as a bridged

mono subwoofer or bridged center channel speaker (with

one JF2000).

If you have satellites designed specifically for midrange and

treble, with a single mono subwoofer designed for bassonly:

Set output switch to MONO (OUT). All other switches IN.

This inverts the right channel output, while leaving the input

stereo. You will connect the left speaker normally, but the

right speaker POS (+) and NEG (-) will be REVERSED from

normal stereo. The center (bridged mono) channel will be

connected between the two RED (MONO) amplifier termi-

nals. (Refer to Fig. 5)

Figure 5

Left Positive (+) terminal (red) to Left Speaker Positive (+)

Left Negative (-) terminal (black) to Left Speaker Negative (-)

Right Negative (-) terminal (black) to Right Speaker Positive (+)

Right Positive (+) terminal (red) to Right Speaker Negative (-)

Left Positive (+) terminal (red) to Mono Speaker Positive (+)

Right Positive (+) terminal (red) to Mono Speaker Negative (-)

REAR PANEL

Switches

Balanced/

Unbalanced Input

Switch

Home Version

Input Switch

(Right Channel)

Output Switch

(Right Channel)

Ground Switch

Input

Connections

Level Adjust

Speaker Fuses

NOTE: Normal stereo position for all rear panel switches is

IN. The only time any of the switches should be OUT is for

one of the special functions in this section.

Be sure to turn the amplifier OFF before changing rear panel

switch positions (to avoid possible pops and clicks).

The Balanced/Unbalanced Input Switch is disabled in the

JF2000. This function is used only with special professional

connectors (XLR and

1/4

inch phone plugs) available with

the PRO6000 professional back panel.

IN position: Stereo. Right input feeds Right channel.

OUT position: Mono. Left input feeds Right channel.

IN position: Stereo (normal). Right channnel is in phase with

Left.

OUT position: Mono. Right channel is reversed in phase

compared to Left.

IN position: Floating (normal). Chassis ground separate

from Output section ground.

OUT position: Chassis. Chassis ground connected to output

section ground.

This switch should be set for minimum system hum.

Input is via standard “RCA” style pin jacks.

Input sensitivity is adjustable with the level controls adjacent

to each input RCA jack. The overall gain ranges form zero

(fully counter-clockwise) to 36 dB (fully clockwise).

The JF2000 is equipped with AGC5-Ampere speaker pro-

tection fuses. These fuses are for speaker protection only.

Most speakers will not handle more than a 5-Ampere fuse (or

less). Refer to your speaker manufacturer’s recommenda-

tions for your fuse selection.

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