Audio Research GSi75 Manuale utente

H I G H D E F I N I T I O N ®

GSi75

Stereo Integrated Amplier

User Guide

H I G H D E F I N I T I O N ®

Thank You.

Thank you for choosing the GSi75 to be a part

of your high performance music listening

system. Since 1970, Audio Research has

been creating some of the world’s nest

audio equipment. Each piece is handcrafted

in Minnesota, and has been designed to

provide many years of listening enjoyment.

We understand you are eager to begin

listening; however, please take a few

minutes to read through this guide for

useful information concerning the operation

of your new integrated amplier. Once

installed, please allow an appropriate break-

in period to fully appreciate the benets

this amplier will provide to your system.

After reading the user guide, if you have any

further questions regarding your integrated

amplier, contact your dealer or Audio Research

customer service - they will be happy to help

you make the most of your new component.

Happy Listening!

Contents

Warnings

Installation

Before Operating the GSi75

To Remove the Top Cover

In Your System

Connections

Back Panel Controls and Connections

Input Connectors

Output Connectors

IR Input

12 volt Trigger

RS-232 Control

Matching

A.C. Power Connection

Operation

Front Panel Controls and Displays

Start-Up

Shut-Down

Break-in

Front Panel Controls

Remote-only Controls

Settings Menu

Using the Headphone Output

Output Tube Bias

Using a Turntable

Using the Digital-to-Analog Converter

Windows Software Installation

Conguring the DAC for Windows

Conguring JRiver Media Center for Windows

Conguring the DAC for Mac OS

Conguring JRiver Media Center for Mac

Conguring Signalyst HQPlayer for Mac

Maintenance

Servicing

Cleaning

Disposal and Recycling Guidelines

Warranty

Specications

Warnings

To prevent re, or shock hazard, do not

expose your GSi75 to rain or moisture.

Do not place objects containing water on top of this unit.

This unit contains voltages which can cause serious injury

or death. Aside from the tube cover, do not operate

with covers removed. Refer servicing to your authorized

Audio Research dealer or other qualied personnel.

The detachable power cord on your GSi75 is equipped

with a heavy gauge, 3-conductor cable and a standard

three-prong grounding plug. For absolute protection,

do not defeat the ground power plug. This provides

power line grounding of the GSi75 chassis to provide

absolute protection from electrical shock.

The appliance coupler (a.c. power connector)

at the rear of this unit must be accessible

for emergency power disconnect.

The GSi75 is shipped with a protective, ventilated

cover. While the cover may be removed, its

use is recommended to prevent accidental

contact with the hot vacuum tubes.

For continued protection against re hazard,

replace the fuse only with the same type and

rating as specied at the fuse holder.

The power button on the front of this unit, when

o, does not disconnect all power from this

unit. This unit is in sleep mode when not on.

This unit is RoHS compliant.

A note about packaging...

Save all packaging in a dry place away from re hazard.

Your GSi75 integrated amplier is a precision electronic

instrument and should be properly cartoned any time

shipment is made. You may not have occasion to

return your unit to the factory for service, but if that

should prove necessary, or other occasion requiring

shipment occurs, the original packaging will protect

your GSi75 from unnecessary damage or delay.

Before operating the GSi75

This unit has been shipped with the vacuum tubes

installed in protective foam in separate boxes packed

inside the shipping carton. Included are two matched

pairs of KT150 power output tubes and two 6H30 tubes.

Remove the tubes carefully from the protective foam.

To remove the top cover

Use a phillips-head screwdriver to remove the fastening

screws from the front and back edges of the tube cover

(you do not need to remove any screws from the side

panels of the cover). Note that the screws between

the tube cover and transformer cover can be dicult

to reach; the included screwdriver will reach them as

well as provide a magnetic tip to remove the screws.

Once all of the screws have been removed, carefully

lift the cover away from the chassis making

sure not to scratch the other surfaces.

After removing the top cover and the vacuum tubes

packed in protective foam, see the accompanying

illustration for instructions on installing the tubes for

your GSi75 in their proper locations in the chassis. Note

that the numbers written on each tube correspond

to a ‘V’ number etched on the chassis next to each

tube socket. Insert each tube rmly, carefully aligning

the tube pins with the corresponding socket holes.

Installation

Note

Double damping rings are installed at the factory and

positioned on each 6H30 tube for maximum sonic

performance.

Installation

In your system

To insure normal component life and safe operation

this unit must be operated only in an upright

position. Adequate airow and proper cooling

can occur only if there is no restriction above

and behind the unit and on either side.

The special non-marring elastomer feet provide

adequate spacing and stability only on a smooth,

hard surface, and also assist to isolate the amplier

from spurious vibrations. For upright stability and

best performance, never operate the unit while it is

sitting on a soft surface such as a thick rug or carpet.

Due to its weight, this amplier must be supported

on a surface specically rated for such a load. Check

with the manufacturer of your support system

to be sure it is rated to handle this weight.

If the unit is to be operated in an enclosure such as an

equipment rack, make certain that adequate airow

above and to each side of the unit is provided.

The ‘ambient’ operating temperature should never

exceed 120 F or 49 C. Improper installation will

cause premature tube failure and will aect your

warranty, as well as the service life of the unit.

It is normal for a vacuum tube power amplier to run

quite warm, and if used for prolonged periods, hot

to the touch. All components within are, however,

operated at safe, conservative levels and will not

be improperly aected thereby, providing the

requirements outlined above are adhered to.

Do not stack components or other objects directly on top

of the GSi75.

Connections

Phono and

Analog Inputs

Digital

Inputs

Speaker

Terminals

(right channel)

Speaker

Terminals

(left channel)

A.C. Mains

Connector

Fuse

RS-232

Connector

Input

Back Panel Connections

Connections

Input Connectors

The GSi75 provides four pairs of single-ended, analog input

connectors: SE1 - 3, and PHONO, and three digital input

connectors: USB, TOS, and RCA. Please note that input

SE3 can be selected as a unity gain ‘processor’ input; in

this case, SE3 should only be connected to a component

with a volume control (such as a home theater

processor). For further information about the SE3

processor mode, see the section ‘Processor’ on page 16.

Note

The phono stage of the GSi75 has two gain settings

of 45 and 62 dB; please keep this in mind when

selecting a phono cartridge to pair with your

preamplier. For further information about

connecting a turntable, please see page 22.

Output Connectors

Heavy-duty output terminals are provided on the rear

panel for 4 or 8-ohm speaker impedance loads. Using

high-quality speaker cables, securely fasten the (-)

speaker lead to the ‘0’ (black) terminal, then the

(+) lead to the ‘4’ or ‘8’ (red) terminal. Follow your

speaker manufacturer’s impedance specication to

determine if you should use the 4 - or 8 - Ohm tap.

The GSi75 puts out the same amount of power

whether the 4 or 8-ohm terminals are used.

RS-232 Connection

The RS-232 connection allows for remote control via

systems such as Creston or other automation systems.

IR Input

The IR input can be used to link the GSi75 to an IR repeater

system with a standard mono 1/8” connector.

Matching

It is important to use as close as possible an

impedance match between the amplier and speaker

for optimum transfer of power to the speaker

with minimum distortion. In the case of speaker

systems with signicant variations in impedance

throughout the frequency spectrum, such as most

electrostatic types, determine the best impedance

match empirically for best overall sonic results.

Connections

A.C. Power Connection

It is important that the GSi75 be connected via its

supplied 20 amp IEC 12-gauge power cord to a

secure, dedicated A.C. power receptacle. Never

connect to convenience power receptacles on other

equipment. Only use the power switch on the front

of the GSi75 for On/O control of the amplier.

The AC power source for the GSi75 amplier should

be capable of supplying 10 amperes for 100 or 120

volt units, or 5 amperes for 220 or 240 volt units.

For the very best performance on 100 or 120 volt

circuits, the GSi75 should be connected to its own

AC power circuit branch, protected by a 15 amp

breaker. The other audio equipment should be

connected to a dierent power circuit and breaker.

The GSi75 should be turned on after the other

components of your system. If the GSi75 is turned

on before other components, the amplier will

amplify any extraneous turn-on noises those

components might generate, which could potentially

damage the loudspeakers. Good operating practice

dictates that the amplier should be turned on

last, and turned o rst in an audio system.

The GSi75 uses a grounding system that does not require

a ground-lifter adapter plug on the A.C. power cord to

minimize hum. The power cord supplied with the GSi75

has a standard grounding plug to provide maximum

safety when properly connected to a grounded wall

receptacle. If there is any question regarding proper

grounding procedures in your installation, seek help

from a qualied technician. Caution should be taken

before using custom after-market power cords: they

must be at least 12-gauge and have a standard grounding

plug properly installed. These power cords are to be

used with caution, at the sole risk of the owner.

If other AC powered equipment is used with the GSi75

it may be necessary to use ‘ground lifter’ adapters

on the power plugs of that equipment to minimize

system hum. Generally, the lowest hum is achieved

when the only direct connection between audio

common ‘ground’ and true earth ground occurs in the

preamplier, through its grounded power cord. Other

equipment in the system should have some form of

isolation to prevent ground loops and associated hum.

Indice

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