Hafler 945 manual Video Switching, Preamplifier Section

Page 13

ANTENNA CONNECTIONS

INITIAL POWER- UP/MUTING SYSTEM

AUDIO LINE LEVEL INPUTS

AUDIO LINE LEVEL OUTPUTS

VIDEO

SWITCHING

A simple "T" shaped dipole ribbon antenna has been provided for FM reception. Connect its leads to the rear panel terminals marked “FM 300 OHM”. For best results, the “arms” of this antenna should be fully

extended,

and

mounted flat against a wall

or

equipment cabinet.

A “loop”

type

antenna has been provided

for

AM reception. It is to be connected to the rear panel

terminals marked “AM ANT” and “GND”. This antenna is attached at one end by a snap-in hinge. As this

antenna is directional, it will usually

be beneficial

to

allow the

antenna to

swing away from the body of

the

tuner, orienting it for best reception. The antenna may

be

completely

detached for maximum freedom

of

placement, by carefully prying it

loose from

the

plastic

hinge.

 

The antennas supplied will yield satisfactory reception in most situations. For further information regarding these antennas, as well as alternate antenna types, consult the section “Additional Information”.

As soon as the 945 Preamp/Tuner is plugged into AC power, the Power Switch will glow amber,

indicating a low power stand-by mode. When the

unit is

turned ON via the front panel Power Switch or

Remote Control, the Power Switch light will

turn

green,

and

the

Volume

Control

Indicator will

begin to

flash green. Once the muting delay period

has

passed

and

the

power

supply

has stabilized,

the light

will turn steady green (unless MUTE was selected when the unit was previously turned off). The Preamp/ Tuner is now ready to enjoy.

The muting will reactivate immediately (and the Power Switch turn amber) upon loss of AC line voltage, operating the Power Switch, or if line voltage falls below a level which precludes proper operation of the Preamp/Tuner’s circuitry.

All selected operating modes that were set

when the unit was turned off will resume

when the power is

turned on again.

It will not, however, “remember” some of the set operating modes if AC power is lost

entirely. Tuner Presets and selected inputs will be retained in memory for a few days.

 

PREAMPLIFIER

SECTION

 

 

 

 

 

 

 

 

 

 

 

 

The

audio

input

jacks

labelled

CD, AN1 ,

A/V2,

and

AN3 are

identical line

level

inputs. These

inputs,

along with the internal AM/FM Tuner, are

selected

via

the front

panel

Input Selector buttons or via the

Remote

Control.

The

selected

function will

be indicated by a green light on

the

corresponding

button.

LINE

OUT:

This

output feeds the selected input

signal to the power amplifier.

 

 

 

A/V

OUT:

This

output

feeds

any

selected

audio

input

signal

(except

A/V3)

to

a

video recorder.

This

may

be

done to

allow

an audio

recording

along

with

a video

signal,

or for

an

audio-only recording.

A/V3 is blocked from this output to avoid possible feedback conditions. A/V3 is for playback (viewing) purposes only, or is recommended to be used as the recording (destination) unit when dubbing from one video device to another.

 

The video input jacks labelled

Video 1, Video 2, and Video

3

are

selected

simultaneously with the

 

corresponding audio AN inputs. When

A/V1 or

A/V2

is selected,

the video signal is fed to both the Video

 

Record

and

Video

Monitor

Outputs

through separate buffer amplifiers. In most

cases, the

Video

Monitor

i Output

will

be

connected to

the

video input of a television receiver/monitor, and

the Video

Record

Output

1 will be connected to the video

input of a video recorder for

dubbing

purposes.

 

 

 

 

 

When

A/V3

is

selected, the

video signal is fed to the Video Monitor Output, but the Video Record output

 

 

is

de-activated

to

prevent

possible

feedback

conditions. AN3

is

for

playback

(viewing)

purposes

only,

 

or

is

recommended

to be

used

as

the recording

(destination)

unit

when dubbing

from one video

device

 

to

another.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-12-

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Page 12 Page 14
Contents Series 945 Preamp/Tuner Power Cord Protection Power SourcesPower Cord Grounding Read InstructionsDamage Requiring Service CleaningPower Lines Object and Liquid EntryTable of Contents Tuner SECTION-FM Tuner SECTION-AM General Information Performance SpecificationsConnection Rackmounting Ventilation Placement Line VoltageRP P Front Panel CALL-OUTS Yant UNSWITCHED’ L I N’ E C O R D Line OUT Video Switched AC Line VoltageOutlet Connector P E 2/EPL Video Record Left ChannelVideo Record Video Switched AC Line Voltage Outlets Rating G H TLine OUT Lefi OUTPreamp /TUNER Remote Control Vszc Preamplifier Section Video SwitchingSignal Signal flow inside the unitTo affect signals sent to the tape deck, then First Signal path. This will depend on TypeMute Control VolumeBalance Control Mono AM/FM SelectorAuto Selector UP/DOWNMono Control Audio Line Level Input Selector System Switching Line AmplifierMuting System AM/FM Tuner General Trouble Shooting Hints Ground LoopsBy a High Will Poor quality Could be Source Noise ThisNoise, rather than a hum If such interferenceAM Antenna Remote Control

945 specifications

The Hafler 945 is a high-performance power amplifier renowned for its exceptional sound quality and innovative design. Serving both audiophiles and professionals in the music industry, this amplifier embodies Hafler's commitment to precision and reliability.

At the heart of the Hafler 945 is its robust architecture, capable of delivering powerful audio output while maintaining clarity and fidelity. With a power rating of approximately 100 watts per channel into 8 ohms, it provides ample power for driving a wide range of speakers, making it suitable for both home audio systems and professional applications.

One of the standout features of the Hafler 945 is its use of a differential input stage, which minimizes distortion and ensures a clean signal path. This design approach enhances the amplifier's ability to reproduce subtle details in the music, allowing listeners to experience their favorite recordings as intended by the artists.

The Hafler 945 also incorporates advanced thermal management technologies. This includes an efficient heat dissipation system that ensures the amplifier operates coolly and reliably, even during extended listening sessions. The incorporation of high-quality components, such as capacitors and resistors, further contributes to the amplifier's overall performance and longevity.

Furthermore, the Hafler 945 is designed with speaker protection circuitry that prevents damage to both the amplifier and connected speakers due to short circuits or overloads. This safety feature provides peace of mind for users, allowing them to enjoy high volume levels without the fear of damaging their equipment.

The build quality of the Hafler 945 is another point of admiration; it features a sturdy chassis with a sleek design that fits seamlessly into various audio setups. Its straightforward controls and connectivity options make it user-friendly, appealing to both seasoned audiophiles and newcomers to the world of high-fidelity audio.

In summary, the Hafler 945 is an exceptional power amplifier that combines powerful performance with advanced technology. Its differential input stage, thermal management, and protection features collectively enhance its reputation as a reliable choice for anyone looking to elevate their audio experience. Whether for critical listening or casual enjoyment, the Hafler 945 remains a distinguished option in the realm of audio amplification.
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