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will automatically go into a standby mode in a few mo-

ments.

AC Line Connector and Power Cord

Your amplifier is supplied with an internationally ap-

proved (IEC) power line connector that accepts the sup-

plied detachable, high-current capacity power cord.

WARNING: Under no circumstances should the round

third prong on the plug be cut, bent or in any other way

defeated as this may result in severe shock.

WARNING: Always turn off the amplifier and unplug

the power cord before making any electrical connec-

tions.

ATI Service Information

The AT1820 series does not contain any user servicea-

ble parts inside. If you suspect a problem that may re-

quire service assistance, contact us at support@ati-

amp.com, or by phone at 323-278-0001. It is important

that only an authorized service agent carry out any re-

pairs. This will assure proper service and preserve the

protection of your Limited Warranty. Keep your sales

slip or receipt in a safe place with this manual so that it

will be available to verify the purchase date, should you

experience a problem covered by out warranty.

Care and Maintenance

Cleaning

When the unit becomes dirty, wipe it with a clean, soft,

dry cloth. If necessary, first wipe the surface with a soft

cloth slightly dampened with a mild soapy water, then

with a fresh cloth dampened with clean water. Wipe

dry immediately with a dry cloth. Never use benzene,

thinner, alcohol or any other volatile cleaning agent. Do

not use abrasive cleaners, as they will damage the fin-

ished of the metal parts. Avoid spraying insecticide,

waxes, polishing agents, or any aerosol product near

the unit.

A Few Words About Hum and Noise

Audible hum, or a discernable low frequency noise, is

one of the most common problems in audio/video sys-

tems. This hum, which may be present even when the

volume is at a low level, is usually caused by a problem

known as "ground loops". A ground loop occurs when

there is a difference in ground voltages between two or

more components that are connected electrically. This,

in turn, creates multiple current paths and causes the

low-level noise, or hum.

The growing sophistication and complexity of home

audio/video systems, and the increased number of com-

ponents used to create these systems has dramatically

increased the potential for the possibility of ground

AT1820 Manual

loops. While it is natural to suspect that the components

in your system are the cause of the hum, in many cases

the cause may be due to other conditions. In particular,

cable TV connections from outside the house have be-

come a major source of hum.

In most cases, one of the following suggestions should

help you to solve a hum problem in your system. Please

try these steps in the sequence shown, proceeding from

one step to the next if the prior suggestion does not

eliminate the problem.

Potential Ground Loops

in a Complex A/V System

Suggestion #1:

To determine if a cable TV connection is responsible

for the hum, first turn all components off. Disconnect

the cable TV feed to your system at the first place

where it connects to your components. Alternatively,

disconnect the cable TV wire where it is connected at

the wall outlet. Turn your system back on, and listen if

the hum has disappeared. If removing the cable TV

feed has eliminated the hum, you will need to insert a

Ground Loop Isolator before reconnecting the cable TV

feed, or contact your cable TV operator to see if they

can better isolate your cable feed.

Suggestion #2:

Turn off all components in your system, and then dis-

connect the input cables at the amplifier. Turn the am-

plifier back on, and see if the hum is still present. If the

hum disappears, the fault may be in the input cables

used. Try replacing them with cables that have better

shielding, and make certain that the input cables are not

running on top of any AC power cords. Change the ca-

bles one at a time to determine if one, or all cables is

responsive. If the hum disappears when the input cables

are disconnected, but returns after the cables are

changed and the system re-connected, the problem may

be caused by your source device.

Suggestion #3:

Ground loop problems may also be caused by poor

grounding of the electrical system in your home, partic-

ularly when there are multiple components with three

prong, grounded, power cords. Try unplugging these

components one at a time, and see if one or all of them

is causing the problem. The ultimate solution to this

type of problem is to re-wire your house with an isolat-

ed, star type-grounding configuration. We recognize,

however, that this may be impractical and expensive. In

some cases, the use of an approved AC Power Isolation

Transformer of sufficient capacity may solve this prob-

lem.

Rev-05/21