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5 FRONT PANEL CONTROLS

1

Press this button

to apply power to the HK 3370. When the
switch is pressed in, the unit is placed in a
Standby mode, as indicated by the amber LED
3 surrounding the 

2. This button MUST be pressed in

to operate the unit. To turn the unit off and pre-
vent the use of the remote control, this switch
should be pressed until it pops out from the
front panel so that the word “OFF” may be 
read at the top of the switch.

NOTE: In normal operation this switch is left in
the “ON” position.

2

When the

1 is “ON,” press this

button to turn on the HK 3370; press it again
to turn the unit off. Note that the 

surrounding the switch 3 will 

turn green when the unit is on.

3

This LED will illumi-

nate in amber when the unit is in the Standby
mode to signal that the unit is ready to be
turned on. When the unit is in operation, the
indicator will briefly turn red, and then change
to green. A red indicator during normal opera-
tion means that the unit is in the Protect mode,
and should be turned off and then checked for
a possible speaker-wire short circuit.

4

This jack may be

used to listen to the HK 3370’s output through a
pair of headphones. Be certain that the head-
phones have a standard 1⁄4" stereo phone plug.

5

Press this button to momentarily

silence the speaker output of the HK 3370.

6

Press this button to

turn the speakers connected to the 

output terminals ‡ on or off.

7

Press this button to

turn the speakers connected to the 

output terminals ° on or off.

7

9 !

#

%

&

(

8

)

@ $

^

*

2

1

3

4

5

6

1 Main Power Switch
2 System Power Control
3 Power Indicator
4 Headphone Jack
5 Mute
6 Speaker 1 Selector
7 Speaker 2 Selector
8 Phone Input Selector
9 T-Mon Input Selector

) Tuning Button
! Tape Input Selector
@ Preset Scan
# CD Input Selector
$ Aux Input Selector
% Preset Selector
^ Dimmer Button
& FM/AM Selector
* FM Mode Selector

( Sleep Button
Ó Bass Control
Ô Treble Control
 Balance Control
Ò Volume Control
Ú Volume/Mute Indicator
Û Information Display
Ù Speaker Selection Indicators
ı Remote Sensor Window

6 FRONT PANEL CONTROLS

8

Press this but-

ton to select the output of a turntable that is
connected to the 

inputs §.

9

Press this 

button to listen to the output of a tape
recorder connected to the 

inputs ª. The T-Mon indicator will illuminate
to indicate that the input source is being 
monitored when the HK 3370 is connected to
a three-head tape deck or another unit with
off-head playback.

)

Press the left side of the

button to tune lower frequency stations and the
right side of the button to tune higher frequency
stations. When a station with a strong signal is
tuned, the TUNED indicator will illuminate in
the 

Û. A brief (1/2

second) press of the button will manually tune
to the next frequency increment, while pressing
and holding the button for a longer period will
automatically tune to the next station with a
signal strong enough for acceptable reception.

!

Press this button

to listen to the output of a tape recorder or other
device connected to the 

inputs ⁄.

@

Press this button to auto-

matically scan through the stations that have
been programmed in the HK 3370’s memory.
The tuner will play five seconds of each station
before moving to the next preset station. To
stop the scan when the desired station is
heard, press the button again. (See page 14 for
more information on the tuner memory system.)

#

Press this button

to listen to the output of a CD player connected
to the 

inputs ¶.

$

Press this button

to listen to the output of a device connected to
the 

inputs •.

%

Press this button to

step up or down through the list of stations
that has been entered into the preset memory.
(See page 14 for more information on tuner
programming.)

^

Press this button to

dim the front panel displays and indicators. The
first press of the button will dim the displays to
one-half normal brightness; the next press will
turn all displays off except for the 

3 and the 

Ù. Note that when

the panel is dimmed, it will return to normal
brightness after the unit is turned off, then on
again.

&

Press this button to

select the tuner as the input to the receiver.
When the tuner is in use, press this button to
change between the AM and FM frequency
bands.

*

Press this button

to select the stereo or mono mode for FM tun-
ing. In the STEREO mode, a 

indicator

will illuminate in the 

Û, and stereo reception will be provided when
stations are transmitting stereo signals. In the
MONO mode, the left and right signals from
stereo broadcasts will be mixed together and
reproduced through all channels. Select MONO
for better reception of weak signals.

(

Press this button to place

the unit in the Sleep mode. Each press of the
button selects the amount of time that will
remain before the unit automatically goes 
into the Standby mode, as shown in the

Û, in the following

order:

Ó

Turn this control to modi-

fy the low-frequency output of the left/right
channels by as much as ±10dB. Set this control
to a suitable position for your taste and room
acoustics.

Ô

Turn this control to

modify the high-frequency output of the
left/right channels by as much as ±10dB. Set
this control to a suitable position for your taste
and room acoustics.



Turn this control to

change the relative volume for the front
left/right channels.

Ò

Turn the knob clock-

wise to increase volume, counterclockwise to
decrease the volume.

Ú

This indicator

will glow green when the HK 3370 is turned
on. Its position will enable you to judge the
relative volume of the unit even when the
speakers are muted or turned off. When the
indicator is pointing toward the left, at an
“8 o’clock” position, the volume is low; when 
it is pointing to the right, as in a “3 o’clock”
position, the volume is loud. When the unit has
been muted by pressing the 

button 

5

®, the indicator will flash.

Û

This display

delivers messages and status indications to
help you operate the receiver.

Ù

These indicators light as a green LED next to
the designation for each speaker pair to show
when they are active. Press the

7 or 

7

to activate

either pair of speakers.

ı

The sensor

behind this window receives infrared signals
from the remote control. Aim the remote at this
area and do not block or cover it unless an
external remote sensor is installed.

90

min

80

min

70

min

60

min

50

min

40

min

30

min

20

min

10

min

OFF

7 REAR PANEL CONNECTIONS

AC 120V 60HZ

400W

(120V, 60Hz)

Ω

¢
∞

¡

™

‹

›

fi

‚

⁄

¤

ª

•

§

¶

fl

‡

a

·

°

£

¡ AM Antenna
™ FM Antenna
£ Phono Ground
¢ Remote IR In
∞ Remote IR Out
§ Phono Inputs
¶ CD Inputs

• Aux Inputs
ª Tape Monitor Play/In
‚ Tape Monitor Record/Out
⁄ Tape 2 Play/In
¤ Tape 2 Record/Out
‹ Main In
› Pre-Out/Main-In Jumper Pins

fi Preamp Out
fl Subwoofer Out
‡ Speaker 1 Terminals
° Speaker 2 Terminals
· Accessory Outlets
a Power Cable

8 REAR PANEL CONNECTIONS

¡

Connect the AM loop

antenna supplied with the receiver to these
terminals. If an external AM antenna is used,
make connections to the

and

terminals in accordance with the instructions
supplied with the antenna.

™

Connect an indoor or

external FM antenna to this terminal.

£

Connect the ground

wire from a turntable to this terminal to reduce
system hum.

¢

If the HK 3370’s front

panel IR sensor is blocked due to cabinet doors
or other obstructions, an external IR sensor may
be used. Connect the output of the sensor to this
jack.

∞

This connection permits

the IR sensor in the receiver to serve other
remote controlled devices. Connect this jack to
the “IR IN” jack on Harman Kardon or other
compatible equipment.

§

Connect the outputs of

your turntable or tone arm to these jacks. Note
that only Moving Magnet (MM) type cartridges
may be used.

¶

Connect these jacks to the

output of a compact disc player or CD changer.

•

Connect these jacks to the

line-level output of any audio device such as a
TV, cable converter or portable audio player.

ª

Connect these

jacks to the Play/Out jacks of an audio recorder.

‚

Connect

these jacks to the Rec/In jacks of an audio
recorder.

NOTE: When these jacks are connected to a
three-head recorder or another device with off-
head playback, it will be possible to monitor
the source being recorded.

⁄

Connect these jacks to

the PLAY/OUT jacks of a second audio recorder.

¤

Connect these

jacks to the Rec/In jacks of a second audio
recorder.

‹

These jacks are the input to the

HK 3370’s power amplifier. Unless an external
power amplifier is used, the jumper pins should
remain connected to the 

jacks ›.

›

These pins connect the receiver’s preamp and
amplifier sections. Unless an external amplifier,
equalizer or speaker processor is used, they should
be left connected. See page 12 for more informa-
tion on external amplifier connections.

fi

These jacks provide an

output for the left and right channels to an
optional external amplifier. In normal opera-
tion, unless an external power amplifier is
used, the jumper pins should remain connected
to the 

jacks ‹.

fl

Connect these jacks to

the line level input of a powered subwoofer. If
an external subwoofer amplifier is used, connect
this jack to the subwoofer amplifier input. When
a single, mono subwoofer is used, make the
connection to the bottom jack.

‡

Connect these

terminals to the appropriate terminals on your
speakers.

°

Connect these

terminals to the appropriate terminals on your
speakers.

·

These outlets may

be used to power low-current draw devices
such as CD players or cassette decks. The power
to these outlets remains on as long as the
receiver itself is on. When the receiver is turned
off, or placed in the Standby mode, power to
these outlets is removed.

NOTE: The power consumption of the devices
plugged into these outlets should not exceed
100 watts.

a

Connect the AC plug to a

nonswitched AC wall output.