ATI AT1802 User Manual

Safety Instructions

WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE.

Read all the safety and operating instructions before
connecting or using this unit.

All warnings on the unit and in this operating manual should
be adhered to.

All operating and use instructions should be followed.

Do not use this unit near water: for example, near a bathtub,
washbowl, kitchen sink, laundry tub, in a wet basement, or
near a swimming pool.

This unit should be installed so that its location or position
does not interfere with its proper ventilation. For example,
it should not be situated on a bed, sofa, rug, or similar surface
that may block the ventilation openings: or placed in a built-in
installation, such as bookcase or cabinet, that may impede
the flow of air through its ventilation openings.

The unit should be situated away from heat sources such as
radiators, heat registers, stoves, or other devices (including
amplifiers) that produce heat.

The unit should be connected to a power-supply outlet only of
the voltage and frequency marked on its rear panel.

The power-supply cord should be routed so that it is not likely
to be walked on or pinched, especially near the plug,
convenience receptacles, or where the cord exits from the unit.

Clean unit only as recommended in this instruction manual.

The power-supply cord of the unit should be unplugged from
the wall outlet when it is to be unused for a long period of
time.

Care should be taken so that objects do not fall, and liquids
are not spilled, into the enclosure through any openings.

The unit should be serviced by qualified service personnel when:
A. The power cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled, into the
unit; or
C. The unit has been exposed to rain, or liquids of any kind; or
D. The unit does not appear to operate normally, or exhibits a

marked change in performance; or

E. The device has been dropped, or the enclosure damaged.

To prevent electric shock, do not use the polarized plug with
an extension cord, receptacle or other outlet unless the
blades can be fully inserted to prevent blade exposure.

Page 2

Please Read First

CAUTION: To reduce the risk of electrical shock, do not
remove the cover (or back). No user serviceable parts inside.
Refer servicing to qualified service personnel.

WARNING: To reduce the risk of fire or electric shock, do
not expose this appliance to rain or moisture.

The lightning flash with arrowhead, within an
equilateral triangle, is intended to alert the
user to the presence of uninsulated “dangerous
voltage” within the product’s enclosure that
may be of sufficient magnitude to constitute a
risk of electrical shock to persons.

The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operation maintenance
(servicing) instructions in the literature
7accompanying the appliance.

PRECAUTIONS:

The amplifier is a wideband design with substantial power
output capability. Certain precautions must be taken to
ensure proper operation.

1. Never expose the unit to moisture

2. Never plug an input cable into the amplifier while the
amplifier is turned on.

3. Never apply the “thumb test” (touching the “hot” lead of
the input cable with your finger) to the tip of the input
cable or input jack of the amplifier. RF rectification and/or
hum will be created and could cause damage to the
loudspeakers. ATI will not be responsible for damage to
the loudspeakers due to improper use of the equipment.

4. Under no circumstances should the output terminals of the
amplifier be short-circuited.

5. Avoid restricting the airflow around the unit. Good
airflow is necessary to help insure proper operation.

6. Be sure that the loudspeakers connected can handle the
output power of the amplifier at the loudspeakers rated
impedance. The warranty on the amplifier does not cover
damage to loudspeakers that have inadequate power
handling capabilities.

7. Do not stack other system components or any other
materials directly on top of the unit. The heat dissipating
system of the amplifier depends on free flowing air around
the chassis.

Table of Contents

Please Read First ............................................................ Page 2

Safety Instructions ........................................................ Page 2

Table of Contents .......................................................... Page 3

Introduction ................................................................... Page 3

Features........................................................................... Page 3

Unpacking....................................................................... Page 3

Placement ....................................................................... Page 3

Handles and Rack Mounting ....................................... Page 3

Getting to Know the Rear Panel .................................. Page 4

Connecting Your Amplifier........................................... Page 5

Input Connections ......................................................... Page 5

Speaker Connections..................................................... Page 5

Making Rear Panel Connections ......................... Pages 6 & 7

Power Control Connections ......................................... Page 8

Power Connection ......................................................... Page 8

Amplifier Operation ...................................................... Page 8

Manual On ...................................................................... Page 8

Automatic On ................................................................. Page 8

Peak Indicator Light ...................................................... Page 8

AC Line Connector and Power Cord ........................... Page 8

Main Circuit Breaker ..................................................... Page 9

Protection Circuitry....................................................... Page 9

ATI Service Information ............................................... Page 9

Care and Maintenance .................................................. Page 9

Trouble Shooting ........................................................... Page 9

A Few Words About Hum and Noise .......................... Page 10

Potential Ground Loops in a Complex A/V System

...Page 10

Power Amplifier Specifications ................................. Page 11

Warranty Terms and Conditions ............................... Page 12

AT1800 Series Power Amplifiers

Congratulations! Thank you for purchasing an ATI Power
Amplifier. Designed, engineered and manufactured in the
United States, it has been carefully designed to deliver the
best possible audiophile-grade performance as well as the
most reliable operation.

The AT1800 Series is comprised of six models; the AT1802
two-channel amplifier, the AT1803 three-channel amplifier,
the AT1804 four-channel amplifier, the AT1805 five-channel
amplifier, the AT1806 six-channel amplifier and the AT1807
seven-channel amplifier. This manual covers all six models
with the only difference being the number of channels you
are using in your audio/video system.

In order to receive the maximum performance from your
new amplifier, please take a few minutes to read this manual.
This important information will help you make certain that
the amplifier is properly configured for operation with the
rest of the equipment in your system.

If you have any questions about this product, its installation
or operation, please contact us via e-mail at
[e-mail] or via telephone at 888-777-8507.

Features

Your new ATI amplifier is a state of the art, high performance,
audio component. It is built utilizing totally complementary
circuitry. A custom-designed, toroidal transformer drives the
high current power supply with multiple windings for each
channel. Each output module employs an advanced optically
coupled protection circuit that replaces the need for
bothersome fuse changes. The amplifier is cooled by convection
through the use of custom designed, efficient heat sinks.

Unpacking

The carton and packing materials used in shipping your new
amplifier were specially designed to protect it from the shock
and vibration of shipping. We strongly suggest that you save
the carton and packing materials to use if you move, or if the
unit ever needs to be shipped back to us for any reason. Should
you discover that your amplifier has been damaged

during

shipping, please contact your dealer or ATI immediately

and

request the name of the carrier so a written claim may be made.

THE RIGHT TO A CLAIM AGAINST A PUBLIC CARRIER CAN BE
FORFEITED IF THE CARRIER IS NOT NOTIFIED PROMPTLY IN
WRITING AND IF THE SHIPPING CARTON AND PACKING
MATERIALS ARE NOT AVAILABLE FOR INSPECTION BY THE
CARRIER. SAVE ALL PACKING MATERIALS UNTIL THE CLAIM
IS SETTLED.

Placement

During normal home operation the heat sinks on the amplifier
will become warm. However, there are instances during high
level playback into low impedance speakers when the heat
sinks will become much warmer than usual. To ensure the
amplifier’s trouble-free operation, it is necessary to provide
adequate ventilation for the heat sinks. Your amplifier should
be kept away from external sources of heat such as radiators
and hot-air ducts. The amplifier should never be placed with
other heat-producing components in a cabinet or enclosure
lacking free airflow. Do not stack other components on top of
your amplifier.

Handles and Rack Mounting

A front panel handle set for the AT1800 is available from your
dealer or ATI for an additional charge. Carefully remove the
four socket-head cap screws using an Allen wrench while
being

careful to avoid scratching the front panel. Follow the
instructions that come with the handles for proper installation.
Your amplifier may be mounted in a standard 19-inch rack by
using the optional 19-inch rack mount panel.

CAUTION: THE RACK MOUNT PANEL CANNOT SUPPORT THE
WEIGHT OF YOUR AMPLIFIER. BE SURE TO MOUNT THE UNIT
ON A STRONG, WELL -SUPPORTED SHELF.

Page 3

Page 4

Getting to Know the Rear Panel

A Audio Inputs

Use the INPUT jacks to connect to the outputs of a
preamplifier, receiver with preout connections, CD player,
or other control devices.

B Remote Trigger Input

Use the REMOTE TRIGGER jack to connect to a compatible
preamplifier, source device, or other product with a

3.3-24VDC output.

C Product Serial Number

Write this number in the space provided on page 10 for
future reference.

D Speaker Outputs

Use the OUTPUT binding posts to connect the amplifier to
your speakers; red for positive, black for negative.

E AC Input

Use the included power cord to connect your amplifier to
an AC power source.

F Master Power Switch

Turns the current to the amplifier on or off.

NOTE: The picture below is an AT1807 seven-channel model.
Other models ranging from two to six channels will only
have two to six sets of audio inputs and speaker outputs.

A

D E F

C

B