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Front Panel Controls

4

ƒ

This button activates the test signal
that is used when adjusting output
levels. When the button is tapped
once the test noise will circulate
between the speakers at a two (2)
second interval. When you press
and hold the button for a few
seconds the test noise will circulate
for five (5) seconds at each speaker.
The red indicator above the button
will illuminate when the test noise is
present to remind you that the audio
output has momentarily been
changed. Press the button at any
time when the noise is heard to
cancel the test.

Note: The test signal noise is not
available when the ADP303 is in the
BYPASS mode. The test signal does
not circulate to the subwoofer in any
mode.

It is suggested that the five second
test noise be used for initial
adjustment of the output levels, and
the shorter two second circulation
be used as a final brief check after
adjustments have been made.

©

Press this button to momentarily
silence the audio output of the
ADP303. Press it again to resume
normal operation. An indicator light
above the button  will illuminate
when the MUTE button is engaged
to remind you that the unit is turned
on, but silenced. The MUTE function
will not work when the ADP303 is in
the BYPASS mode.

˙

These controls are used to adjust
the audio output level of each
individual channel. Use the small
Allen wrench supplied with the
ADP303 to remove the cover when
adjustment of the level trims is
required. 

î

This knob adjusts the master volume
level of the ADP303’s output. Turn it
clockwise to increase the volume
and counterclockwise to decrease
the volume. 

When the ADP303 is used in a
system where the receiver/amplifier
(such as the AVR80 ) has a “6
Channel Direct” input, the volume
should be set to the “12 o’clock”
position.

å

Push this switch once to turn it on.
Press it again to turn the unit off. An
indicator above the power switch will
illuminate when the unit is turned on.

∫

Press this button to set the delay
time for the surround channels. Each
press of the button changes the
delay time by 5 milliseconds. The
delay time range is from no delay to
15 milliseconds. The indicator LEDs
above the Delay Time button
indicate the delay setting.

ç

Press this button to remove the
ADP303 from the circuit when it is
installed between a preamp and
amplifiers. An indicator LED above
the button will light to indicate the
BYPASS mode.

∂

Press one of these buttons to select
the digital input source. An indicator
above the buttons will illuminate to
confirm the selections. 

é

This LED will illuminate when a
digital source is selected and the
decoder has successfully locked to
the incoming digital signal.

POWER

Volume

Delay Time

0

5

10

15

Bypass

RF

Optical

Coaxial

Test

Mute

LEFT

CENTER

RIGHT

LEVEL TRIM

SUB. W

L • SURROUND • R

å

∫

ç

∂

é

©

ƒ

˙

î

24093_ADP 303 Eng.  27/02/1998 10:34  Side 5

5

Rear Panel Connections

¡ AC-3 RF IN Jack

Connect the AC-3 RF Output jack of
a compatible Laser Disc player
here.

™ AC-3 Digital IN - Coax Jack

These terminals are for connection
to the coax data AC-3 output of
future AC-3 digital products such as
DVD, DSS and HDTV.

£ AC-3 Digital IN - Optical

Jack
These terminals are for connection
to the optical data AC-3 output of
future AC-3 digital products such as
DVD, DSS and HDTV. To avoid dust
contamination, leave the protective
cap inserted unless the jack is in
use. 

IMPORTANT NOTE: These input
jacks are for AC-3 digital signals
only. Do not connect standard audio
outputs or the PCM digital output of
an LV or CD player to these AC-3
Input Jacks.

¢ 6 Channel Input Jacks

When the ADP303 is used with an
external preamplifier, an outboard
surround processor or any AV
receiver with PREAMP-OUT/MAIN-
INPUT jacks, connect these jacks 
to the outputs of the preamp or
processor.

∞ 6 Channel Output Jacks

These jacks deliver the outputs of
the AC-3 decoder or pass through
the inputs from a preamplifier/
processor (see item 4) when the
ADP303 is in the BYPASS mode.
Depending on your application, they
will either be connected to the “6
Channel Direct” inputs of products
such as the AVR80 or directly to
external power amplifiers .

§ Front SPK Switch

This switch determines if low
frequency signals are sent to the
front left/right speakers. The factory
default “Small” sends them to the
subwoofer output only, while “Large”
sends a full range signal to the front
left/right speakers.

¶ Surr SPK Switch

This switch determines if low
frequency signals are sent to the
surround speakers. The factory
default, “Small,” sends them to the
subwoofer output only, while “Large”
sends a full range signal to the
surround speakers. Select “none” if
you will not use surround speakers
and to route surround audio to the
front left/right speakers.

• Center SPK Switch

This switch determines if low
frequency signals are sent to the
center speaker. The factory default ,
“Small,” sends them to the
subwoofer output only, while “Large”
send a full range signal to the center
speaker. Select “none” if you will not
use a center speaker and to route
center channel audio to the front
left/right speakers.

ª Subwoofer switch

This switch, in conjunction with the
other “SPK” switches, directs the
output of low frequency (LFE)
signals. If a subwoofer is used,
select “ON”  to send all system
sound below 100 Hz to the
subwoofer output. If the “OFF”
position is used, the LFE output will
be directed to either the front
left/right or center speaker outputs,
depending on the position of
switches 

§ and •.

Caution: When you want to change
settings of any ot these switches,

§¶•ª you must turn the power

switch off and back on in order to
effect the changes you want. 

‚ AC Outlet (Unswitched)

This unswitched outlet will supply
power to any device in your system
as long as the ADP303 is connected
to AC power, even when the
ADP303’s power switch is in the off
position.

The maximum power this outlet can
supply is 200 watts.

⁄ Power cable

Connect the power cable to an
unswitched AC power outlet. Plug
into a household AC power outlet.

L            R

SURROUND

SUB

WOOFER

CENTER

L            R

AC-3

DIGITAL IN

OPT

MODEL NO.: ADP303
HARMAN KARDON
NORTHRIDGE
CALIFORNIA, USA
MADE IN JAPAN

AC-3

DIGITAL IN

COAX

AC-3
RF IN

FRONT SPK.

LARGE

SMALL

SURR. SPK.

CENTER SPK

SUB. W SPK

IN

OUT

AC OUTLET

UNSWITCHED

LARGE

NON

SMALL LARGE

NON

SMALL

OFF

ON

¡

™ £

¢ ∞

§ ¶ • ª

‚

⁄

24093_ADP 303 Eng.  27/02/1998 10:34  Side 6

Installation & Setup

The ADP303 delivers optimal perfor-
mance when it is used with the Harman
Kardon AVR80 or AVI250 although it is
also compatible with many other home
theater system configurations. Please
follow the instructions in this section
that describe the equipment and speaker
choices that most closely resemble that of
your own system. Depending on the
equipment in use, some of the switches
and settings may require adjustment,
while in other cases they may be left in
their factory preset positions.

Depending on the specific equipment in
your home theater setup, the ADP303 can
be connected in one of three configura-
tion options:

• Direct connection to A/V products such
as the Harman Kardon AVR80 or AVI250
that feature a SIX CHANNEL DIRECT
INPUT.

• Connection between an existing A/V
surround processor/pre-amp and your
power amplifier(s) and subwoofer (for
owners of separates-based home theater
systems).

• Connection to the PRE-OUT/MAIN-IN
jacks on the rear panel of your A/V
receiver, provided that it is equipped 
with 5 pre-out/main-in jack pairs and a
subwoofer output jack.

The home theater system you already
have installed should work with the
ADP303 provided that there are left,
center and right front speakers, left and
right rear/surround speakers and a
subwoofer. For best results we
recommend that the front speakers be of
the same type, with identical or similar
driver units. This will deliver smooth
pans across the front sound stage as the
action moves from side to side.

Rear channel speakers need not be
identical to the front channel speakers,
but they should be of high quality. One
of the benefits of Dolby Digital AC-3 is
that the surround channels are full
range, while they were frequency limited
in earlier ProLogic type systems.

Bass effects are also an important part of
home theater. For optimal enjoyment a
subwoofer should be used as it is
optimized for low frequency
reproduction. If you have large full range
front speakers, however, they may be
used in place of a subwoofer with proper
setting of the rear panel switches.

For the best advice on speaker selection
consult your Harman Kardon dealer.

Since the ADP303 may be used with a
wide variety of speaker types, it is
important that you adjust the rear panel
speaker mode switches before use. Setting
these switches will tell the ADP303 what
type of speakers you are using so that the
audio outputs will be directed to the
proper speaker.

In general, a “Large” speaker is defined
as a traditional full range speaker that
includes a woofer or some prepackaged
“satellite/subwoofer” systems and is
capable of reproducing sounds below 100
Hz. For the purposes of this product, a
“Small” speaker is one that is not
capable of delivering sounds significantly
below 100 Hz. (Most “satellite” type
speakers fall into this category.) Before 
setting the switches make note of the type
of front, center and rear speakers that
will be used. For further clarification of
your speakers’ type consult the speaker
owner’s manual and look on the
“specifications” page to find the
frequency range.

When you have the information on your
speakers, set the four switches as follows:

1) Front Speaker Mode 
This switch determines the frequency
range of the front left/right speakers.
Select Large or Small depending on the
type of speaker you will be using. The
factory default setting is “Small”.

Large: Set the switch to this position if
you are using full range speakers that are
capable of reproducing sounds below 100
Hz. In this position, the output to the
front left/right output jacks is full range.

This switch position should also be used
if you are using a packaged speaker
system where the first input feed is to the
subwoofer. Although subwoofer/satellite
systems normally use the “small”
setting, some systems contain a crossover
within the subwoofer, and send filtered
sounds to small speakers. Consult your
dealer or the speaker system’s owner’s
manual if you are uncertain if this is an
appropriate setting.

Small: Set the switch to this position if
you have small, frequency limited
satellite type speakers that do not
reproduce sounds below 100 Hz, and
whenever a subwoofer is used. Use this
setting if you have a subwoofer satellite
system where there are separate feeds to
your subwoofer and the small satellite
speakers (but then an extra subwoofer is
neccessary for the LFE channel). When
the Subwoofer Mode Switch 

ª

is in the

“ON” position, front Low Frequency
Effects (LFE) audio will be routed to the
subwoofer.

2) Surround Speaker Mode
This switch determines the frequency
range of the rear surround speakers.
Select Large, None or Small depending
on the type of speakers you will be using.
The factory default setting is “Small”.

6

24093_ADP 303 Eng.  27/02/1998 10:34  Side 7

1. Using the remote control or front
panel controls appropriate to your
receiver, processor or pre-amp, make
note of the delay time setting you use for
normal surround listening.

2. Press the front panel DELAY 

∫

button

until the delay time indicator illuminates
to show a setting that is closest to that
used with your conventional surround
system.

The ADP303 may be used in one of three
operating modes, depending on the other
equipment in your system. Before
proceeding to the final adjustments,
check to make certain that the ADP303 is
connected to the components in your
system based on one of the three options
shown on the following pages. Note that
proper system calibration and operation
are dependent on making the right
connections and use of the controls as
outlined on each page.

If you will be using the ADP303 in
conjunction with an AVR80, AVI250 or
other AV receiver equipped with direct
inputs for a “6 Channel Direct”
connection via RCA jacks, use the system
configuration shown on page 8.

If you will be using the ADP303 in
conjunction with an external preamp or
surround sound processor, use the system
configuration shown on page 9.

If you will be using the ADP303 in
conjunction with an AV receiver equipped
with “pre-out/main-in” jacks for all five
audio channels, use the system
configuration shown on page 10.

Installation & Setup

Large: Set the switch to this position
when using traditional full range
loudspeakers that are capable of
handling sounds below 100 Hz. In this
position, the output to the surround
output jacks is full range. 

None: Set the switch to this position
when no surround speakers are
connected.  In this position the full range
surround audio that would otherwise be
routed to the surround channels will be
mixed in with the FRONT LEFT and
FRONT RIGHT audio. 

Small: Set the switch to this position
when using smaller bookshelf or
“satellite” speakers that have limited low
frequency range and are unable to
reproduce sounds below 100 Hz. When
the switch is in the “Small” position all
sounds below 100 Hz will be routed to the
Subwoofer output jack. When the
Subwoofer Speaker Mode switch 

ª

is in

the “ON” position, LFE surround audio
will be routed to the subwoofer. When the
Subwoofer Speaker Mode Switch 

ª

is in

the “OFF” position, LFE surround audio
will be routed to the front left/right
speakers.

3) Center Speakers Mode
This switch determines the frequency
range for the center channel speaker.
Select Large, None or Small depending
on the type of center channel speaker
installed. The factory default setting is
“Small”.

Large: Set the switch to this position
when using traditional full range loud-
speakers that are capable of handling
sounds below 100 Hz.

None: Set the switch to this position
when a center channel speaker is not
connected.  Full range audio signals that
would otherwise be routed to the center
channel will be mixed in with the
FRONT LEFT and FRONT RIGHT audio.

7

Small: Set the switch to this position
when using a smaller bookshelf or
“satellite” center speaker that has limited
low frequency range and is unable to
reproduce sounds below 100 Hz. When
the switch is in the “Small” position, LFE
Center audio will be routed to the
Subwoofer output, provided that the
Subwoofer Speaker Mode Switch 

ª

is in

the “ON” position. Otherwise it’s routed
to the front speakers.

4) Subwoofer Mode
Set this switch to determine the routing
of low frequency sounds for all channels.
The factory default setting is “ON”, to
indicate that a subwoofer is present.

On: Select this position if the ADP303 is
connected to an amplifier or Receiver
equipped with a Subwoofer INPUT
terminal, or if it is directly connected to a
powered subwoofer.

Off: Select this position if a Subwoofer
will not be used. 

In this position the low frequency sounds
(below 100 Hz) will be routed to the
FRONT LEFT, RIGHT and/or CENTER
terminals, depending on the setting of
the speaker switches for those channels. 

5) System Reset
Once you have completed any changes to
the Speaker Selection Switches turn the
ADP303 off, and then on again to enter
the settings into the unit’s memory for
future use.

Delay time adjustment enables you to
adjust the timing between signals at the
front and rear channels. Since the use of
the ADP303 may bypass the delay settings
in your receiver or preamp it is important
to establish a proper delay setting for use
in 6 channel operation.

24093_ADP 303 Eng.  27/02/1998 10:34  Side 8