Thank you for choosing a Harman Kardon
Tunnel Cooled amplifier. This is a superb
piece of high fidelity equipment that has
been meticulously designed to provide you
with many hours of enjoyment.
Harman Kardon's Tunnel Cooled amplifiers
are the result of an extensive engineering
project to create the finest automotive highfidelity amplifiers available. These amplifiers provide superior performance, can
operate under extreme environmental
conditions, and are highly adaptable to
various system configurations.
This manual describes the features and
capabilities of your new amplifier. In
addition,
connecting your amplifier to your system.
Please read this owner's manual and carefully follow the instructions for connection.
it
describes the proper methods for
Table of Contents
Harman Kardon design philosophy
TC600, TC300, and TC304 features
introduction
Installation precautions
Charging system considerations
Mounting location
System configurations
Connecting the TC-series amplifier
General information
Power connections
Audio input connections
Speaker output connections
Controls and operation
Application drawings
Series-Parallel and minimum impedance
speaker connection
Troubleshooting checklist
Fan reversal for multiple amplifier
installations 33
Specifications
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5
6
7
7
8
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13
17
18
19
22
29
3
34
4
I
1
1
O
1990
Harman Kardon. Inc.
Harman Kardon design philosophy
The TC Series amplifiers employ the key
Harman Kardon design principles of highinstantaneous current capability (HCC),
ultrawidebandwidth, low negative feedback,
and fully discrete preamp and output
circuitry.
HCC (High-instantaneous
Current Capa,bility)
While reproducing dynamic music
signals, the instantaneous impedances of
nearly all loudspeakers drop to less than a
third of the nominal rating. These low
momentary impedances typically require
three to six times more current from the
amplifier than would a nominal Cohm
resistive load. The TC600 amplifier can
supply 100 amperes of instantaneous
current, while the TC300 and TC304 can
supply 50 amperes. This HCC provides
control over the low impedance and
fluctuating phase angles produced by
normally operating speakers, ensuring
that your speakers will be able to continually reproduce the entire dynamic range
of music without premature clipping or
current limiting.
Bridgeable
All TC Series amplifiers are designed to
provide increased power into
4
stereo or
lower-quality amplifiers, the TC Series
amplifiers can
power. Stable, reliable operation in these
higher power modes is assured by the TC
Series' wide-margin Safe Operating Area
(S.O.A.), which anticipates the toughest
operating conditions.
ohms bridged. Unlike many
be
bridged for increased
2
ohms
Ultrawidebandwidth
Unlike conventional automotive amplifiers, the TC600, TC300, and TC304 can
reproduce musical frequencies ranging
from less than lOHz to more than
100kHz. This ultrawidebandwidth improves the accuracy of reproduction of
transient signals and ensures phase linearity.
Low
negative feedback
This design philosophy is used by the
world's most exclusive amplifiers. It
requires the highest quality internal
components, and results in an extremely
stable amplifier with unmeasurable TIM
distortion and absolutely outstanding
imaging characteristics.
Fully discrete circuitry
Rather than employing inexpensive
integrated circuits, which reduce band-
width and increase required negative
TC600, TC300,
and
TC304
Features
feedback, the TC Series amplifiers use
completely discrete (separate) electronic
components for greatly improved
linearity and less distortion.
Ultrawidebandwidth combined with low
negative feedback and fully discrete
curcuitry maintains the correct harmonic
and phase relationships in your music,
providing superior imaging and definition.
Designed and manufac-
tured in the
The TC Series amplifiers were designed
with the aid of CADICAM computer
at
systems
industrial complex. The result is rugged,
high-performance amplifiers employing
only the highest-quality parts and materials,
including double-sided fiberglass-epoxy
printed circuit boards and high-current
capacity bipolar transistors.
Harman Kardon's state-of-the-art
U.S.A.
Transverse tunnel fan
cooling
Major heat-producing components in the
amplifier are mounted directly to the center
heat sink, localizing the area to be cooled.
Harman Kardon's exclusive transverse
tunnel cooled design employs a fan to
eliminate heat directly from the heat sink,
enabling the amplifier to remain cool to the
touch and permitting installation in re-
stricted spaces, such as under car seats.
This exclusive design not only protects the
preamplifier and power supply components
from high temperatures, but also keeps dust
and dirt from contaminating the inside of
the amplifier, further ensuring reliable op-
eration.
Two-stage music-linked
cooling fan speed
The music link whisper fan operates
inaudibly until the music volume rises, then
goes to a higher speed for more efficient
cooling without interference with your
listening pleasure. The fan returns to its
inaudible state between musical passages.
Reversible fan
For side-by-side multi-amp installations, the
fan in each TC Series amplifier can be
reversed, providing control over the
direction of the cooling air flow. This
enables you to prevent the warm air from
one amp from being vented into the tunnel
of the next amp.
Simultaneous stereo
plus bridged mono
operation
For one-amplifier stereo satellite/mono
subwoofer systems, the TC Series amplifiers can provide stereo and bridged mono
operation simultaneously, eliminating the
need for electronic crossovers and additional amplifiers.
50Hz
All
boost equalization, enabling you to adapt
your sound to your personal taste and compensate for acoustic limits inherent in the
automotive environment.
boost
TC
Series amplifiers provide
50Hz
Fully regulated highcapacity power supply
The high-capacity power supply is fully
regulated, ensuring stable amplifier operation over a wide voltage range and cornpletely eliminating damage to speakers due
DC
leakage.
to
B+ and remote-on
power noise filtering
The TC Series amplifiers contain powersupply filters that effectively reject any
power-supply-related noise, such as
B+
alternator whine. The 12-volt
power input is filtered by a bank of capacitors and a large high-current inductor.
main
Balanced differential
variable-gain inputs
The input circuitry on TC Series amplifiers
isolates signal cables from potential ground
loops and radiated noise. In addition, it
allows preamp or high-level (speaker)
inputs to
amplifier inputs.
be
directly connected to the
Introduction
This manual covers all three of the Harman
Kardon TC Series amplifiers: the TC600,
TC300, and TC304. Because of their clean,
powerful design, these amplifiers can be
used full-range or in specialized multi-amp
systems as bass, midrange, or treble
amplifiers.
The TC600 and TC300 are two-channel
(stereo) amplifiers that can be bridged into a
single channel. The TC304 is a fourchannel amplifier that can be configured for
four, three, or two discrete channels. All of
the TC Series amplifiers are capable of
operating in simultaneous stereo plus
bridged mono mode, which allows for immense flexibility in system design and
future upgrade potential.
Please read this manual for information
about system design considerations,
connections, and operation. Before you
begin your installation, determine your
speaker configuration, wiring route, and
location of the amplifier(s). Retain this
manual for future reference.
Important
The TC Series amplifiers are professionalquality amplifiers that can be incorporated
into any automotive system, from the
simplest to the most complex. We strongly
recommend professional installation of your
TC Series amplifier to ensure that you
obtain the optimum performance from your
entire system.
Warranty card
Fill out the warranty card and
sules receipt.
proof of purchase and you will need it to
establish the date on which your warranty
begins. You will
service is necessary during the duration of
the Limited Warranty.
Your sales receipt is your
be
required to show
suve
your
it
if
Caution
Listening at extremely loud sound
levels can cause a temporary loss in
your hearing acuity. Continued
exposure can eventually cause this loss
to become permanent. We caution you
to be aware of the long-term effects of
sustained high-volume sound. and we
recommend that you use discretion
when listening for extended periods.
Installation precautions
Disconnect the negative
terminal before beginning your installation, and do not reconnect it until all
connections have been made and you are
completely finished with your installation.
As the very last step before reconnecting
the battery, connect the positive power
lead (sometimes referred to as
the amplifier to the battery terminal.
(-)
battery
B+)
from
Important:
circuits that can do major damage
(including potential for fire), you must
install a fuse within 18" of the positive
(+)
battery terminal on the positive
power lead to the amplifier. (See the
"Connections" section for information
about fuse size).
To prevent serious short-
B+
Make sure that the inlets and outlets for
the amplifier's cooling fan are unobstructed. You must install the amplifier
in such a way as to allow free air flow
through the cooling tunnel to ensure that
the amplifier will be able to dissipate its
heat.
Pay particular attention to the power
ratings of the speakers you choose. Many
speakers are not capable of handling the
high power produced by the TC Series
amplifiers. Match your speakers to the
power ratings of the amplifier(s) you will
be using, and never operate your speakers
at higher levels than specified.
Charging system Mounting
considerations location
The TC600, TC300, and TC304 are high-
performance amplifiers whose current
demands place an additional load on your
car's battery and charging system. Depend-
ing on the volume at which you are playing
your system, the amplifier can draw an
average of 20-40 amperes, and under
certain extreme operating conditions, can
draw up to 90 amperes in the case of the
TC600.
Because of the additional demand, the life
of your car's battery and charging system
may be shorter than it would have been
before you installed your music system.
You may need to install a heavy-duty
charging system and a high-quality heavyduty battery to support the higher demands
on the charging system. Depending on your
listening habits, you may want to install a
second battery and an isolation switching
system. Consult your Harman Kardon
dealer for professional assistance.
Harman Kardon's tunnel cooled design
keeps your amplifier cool to the touch.
it
enabling you to install
confined space, such as under a seat with
limited clearance. Just be sure that you
don't block or restrict the inlet or outlet to
the amplifier's tunnel, so air can be circu-
lated freely by the fan. This cooling method
allows the amplifier to be positioned in any
orientation (horizontal, vertical, upside
down).
Do not install your amplifier in a location
where
it
would be exposed to rain, moisture,
or direct sun, and do not allow dirt or
foreign objects to enter the cooling tunnel.
Use the amplifier itself as a template for
marking the mounting holes. Before you
drill mounting holes, make sure that you
know what is located directly behind the
panel you're drilling through (e.g., gas tank,
brake lines, wires, etc.).
even in a very
System configurations
This section describes some of the system
configurations possible with the TC Series
amplifiers.
Low-level input to amplifier
TC-Series amplifiers are most commonly
used with a low-level (preamp) input signal
from the head unit. A control on the TC
Series amplifiers enables you to adjust the
input signal level for optimum performance.
(See the "Controls and operations" section
for information on adjusting input level.)
High-level input to amplifier
All TC Series amplifiers can also accept a
high-level (speaker-level) input signal from
a head unit that has no preamp-level outputs. In this situation, the leads from your
head unit that would ordinarily connect
directly to your speakers are instead
connected to the input of the TC Series
amplifier.
amplifier enables you to adjust the input
signal level for optimum performance. (See
the "Controls and operation" section for
information on adjusting input level.)
A
control on the TC Series
Normal stereo or four-channel
full-range operation
("Full-range" means that a single amplifier
provides the entire spectrum of audio
frequencies to a speaker or speakers with no
electronic crossover used.) Either the
TC600 or the TC300 am~lifier can be used
in a normal two-channel stereo installation
in which the amplifier provides power for
both the left and right channels. The TC304
can
be
used in a normal four-channel
installation in which the amplifier provides
power for left and right channels, both front
and rear
Dedicated full-range bridged
amplifier operation
Any TC Series amplifier can be bridged.
combining two of its channels into a single
channel to provide higher power. The
TC600 or TC300 can be bridged to convert
from stereo operation to higher-power mono
operation. In this configuration, the amplifier provides all its power into a single
channel. The TC304, being a four-. three-,
two-channel amplifier. can be bridged to
combine one or two of its channel pairs into
one or two single mono channels.
Bridged amplifier operation
with electronic crossover
If
you install an electronic crossover
unit
between the head
and the TC Series
amplifier. you have several options for
in
using TC Series amplifiers
bridged mode,
such as:
Use the TC600 as a dedicated mono
amplifier running parallel subwoofers.
Note:
Becmtse rher.e ur.e wl:\.fi.w
em
thut cat1 hutrdle
orrs
power.
~ithorrt clunia~c, rzve do not
600
watts ~fc~otrtit~rr-
nmf-
r.ec~onrn~ctrd irsitlg the TC600 it! hridgcd
VIOIIO
mode wi~h nrost sit~gle srrhwmjiw.
Use the TC300 as a dedicated mono
amplifier running a single subwoofer or
other combinations of series/parallel
woofers.
Use the TC304 in one of two ways:
(a) as a dedicated two-channel amplifier
running two single subwoofers.
or
(b) as a stereo high-pass amplifier to two
stereo channels and as a mono low-pass
amplifier to a mono subwoofer channel.
Use the TC304 as a four-channel high-
pass satellite amplifier. and use either a
a
TC600 or TC300 as
dedicated sub-
woofer amplitler.
Simultaneous bridged-mono/
stereo satellite operation
You can use any of the TC Series amplifiers
in a simultanous bridge-monolstereo mode
(also known as center-channel configuration
or derived three-channel operation). In this
configuration, a single amplifier runs a
stereo pair of satellite speakers as well as a
single subwoofer speaker simultaneously.
With a TC Series amplifier, this configura-
tion does not require the use of either an
active electronic crossover or extra amplifi-
.
ers. However, you will need to use passive
crossovers on all three speakers so the
stereo satellite speakers and the subwoofer
do not operate in the same frequency range.
If you're using a two-channel amplifier
(either the TC600 or TC300), the speaker
leads will be connected to both the
normal stereo connectors and to the
bridged-mono connectors simultaneously.
If you're using the TC304 four-channel
amplifier. the amplifier can operate in
normal fourchannel mode and simultaneously provide bridged power output on
either one or both front and rear channel
Simultaneous bridged-mono/stereo operation
speakers, or from the left front to right
rear and right front to left rear for nonfade bass operation.
4,3,2
four-channel amplifier
The TC 304 four-channel amplifier can
configured to provide either four, three, or
two separate channels of power. Some
examples of different types of 4,3,2,
operation have been described in this
manual, but there are many more possible
application combinations. The 4-3.2
operation of the TC304, combined with simultaneous bridged operation, provides
almost unlimited flexibility for automotive
system design.
operation using the
TC304
be
Connecting the TC-series amplifier
This section is divided into four separate
parts:
1. General information
2.
Power connections
3.
Audio input connections (from the head
unit to the amplifier)
4. Speaker output connections (from the
amplifier to the speakers)
be
Please
ensure that your amplifier is connected
properly.
sure you read all four parts to
General information
DISCONNECT THE BATTERY'S
NEGATIVE
YOU BEGIN YOUR INSTALLATION,
AND DO NOT RECONNECT IT
UNTIL YOU ARE COMPLETELY
FINISHED!
(-)
TERMINAL BEFORE
Connection tips:
Do not connect the main positive lead
(B+) from the amplifier to the battery
until after all other connections have been
made.
Use the proper gauge of wire:
larger from the amplifier to the battery,
and 18 gauge or larger from the amplifier
to the speakers.
If you choose to use crimp-type connectors in your system, use high-quality
connectors of the proper size, and crimp
them correctly to ensure optimum
electrical contact.
Be sure to solder any splices in your wire,
and seal the splice with heat-shrink tubing
or electrical tape.
I0
gauge or
The connectors on
TC
Series amplifiers
are large enough to accept up to 10-gauge
wire. If you want to use a heavier gauge
of wire than will fit into the connector,
remove one strand at a time until the end
of the wire can fit. Even though strands
are removed at the connector end, you
still receive the benefits of the heaviergauge wire, since the significant loss in a
long run of wire occurs along its length,
and not at its relatively short termination
point.
The screw-type connector used on
TC
Series amplifiers works most effectively
when the stranded wire is
not
tinned with
solder. When the tiny wire strands are
loose, the connector can compact them
uniformly, achieving maximum surface
area contact between the wire and the
connector. Use a good screwdriver and
tighten the connector securely enough to
ensure that the wire will not pull out.
Wire-routing tips:
Plan your wire routing carefully before
you begin your installation.
Always route signal cables separately
from power cables to avoid noise in the
system. For example, run your power
cables along one side of the car chassis
and the signal cables down the opposite
side.
Keep each ground wire as short as
possible to avoid power loss and the
possibility of introducing noise into your
system.
Use grommets or other protective devices
when running wires through metal parts.
If you have mounted several amplifiers
and accessory devices (e.g.. electronic
crossovers, equalizers, etc.) together in
the same area, connect all the ground
leads from these devices to the same
ground point on the metal chassis of the
car. Do not connect one unit to another
unit's negative ground terminal and rely
on the second unit's ground wire to
ground both units (daisy-chaining). This
configuration can cause a ground loop,
which can introduce noise into the
system.
Power connections
Your
TC
Series amplifier requires a positive
12V
battery connection and a negative
ground. Use 10-gauge or larger wire for
these connections.
12V
TC600
12V
Positive
Remember-: Connecting your. amplifier to
the positi,te terminal of your battery is the leads separately from the preamp output
last thing you do, afrer all other- connections
in your system have been conzpleted.
(B+)
connection
The TC600 requires two individual wires
connected to the two battery
on the amplifier. Make sure you route these
cables to avoid the possibility of noise in
the system. There are two methods you can
use to complete this connection:
er
connections
(+)
terminals
I
SIGNAL INPUT SPEAKER OUTPUT
Option
1:
Connect two 10-gauge or larger Option
wires to the positive terminal on the
battery. Within 18" of the battery battery. Within 18" of the battery
terminal, insert a 45-amp fuse, fuseable
link, or circuit breaker in each lead.
Connect each lead to one of the two the single lead to the area where you have
(+)
battery
terminals on the TC600.
2:
Connect a single 4-gauge or
larger lead to the positive terminal on the
terminal, insert a 90-amp fuse, fuseable
link or circuit breaker in the lead. Run
mounted your TC600, then use a splitter
to split to two 10-gauge leads that then
connect to the two battery
the TC600.
+
terminals on
12V
Ground
Connect two 10-gauge or larger wires to the
two ground
then run both leads to the same point on the
metal chassis of the car. Make sure you
scrape down to bare metal, and make sure
that the metal is directly part of the main
vehicle chassis. Keep the ground leads as
short as possible.
(EL)
connection
(-)
connectors on the TC600,
TC3OO
12V
or
TC304
Positive (B+) connection
Remember: Connecting your amplifier to
the positive terminal of your battery is the
last thing you do, after all other connections
in
your system have been completed.
Connect a 10-gauge or larger wire to the
positive terminal on the battery. Within 18"
of the battery terminal, insert a 45-amp fuse,
fuseable link, or circuit breaker in the lead.
Connect the lead to the battery
on the
TC300
or
TC304.
(+)
terminal
Make sure you
route this lead separately from the preamp
output cables to avoid the possibility of
noise in the system.
12V
Ground (B-) connection
Connect a single 10-gauge or larger wire to
(-)
the ground
run
the lead to the metal chassis of the car.
connector on the amp, then
Make sure you scrape down to bare metal,
and make sure that the metal is directly part
of the main vehicle chassis. Keep the
ground lead as short as possible.
TC304
SIGNAL INPUT SPEAKEROUTPUT
LR
LR
power connections
L
(~lusaan~islsed
0-logawie
Remote-on
Many head units provide a remote-on lead,
which connects directly to the Remote
connector on your TC Series amplifier.
Turning on your head unit will. in turn,
automatically turn on the amplifier. If your
head unit does not have a remote-on lead.
you can still wire your system for remote
turn-on by using one of these options:
Option
I
:
Connect the antenna power lead
to the Remote terminal on the TC Series compartment to switch the positive
amplifier.
require that you have the power to the Remote terminal on the amplifier.
radio on when you play a tape or CD. Alternatively, you can use the accessory
Note:
This configuration may terminal on the battery (+12V) to the
Option
2:
Wire a switch in the passenger
position on the ignition switch to switch
+
12V to the Remote terminal.
Audio input
connections
There are two types of input signals that
your TC Series amplifier may receive: lowlevel (preamp-level) output or high-level
(speaker-level) output.
Low-level (preamp-level)
connections
Connect the left and right preamp output
cables from your head unit, electronic
crossover, low-level equalizer (commonly
referred to as a passive equalizer), or
preamplifier to the left and right INPUT
RCA
connectors on your TC Series amplifier. (See the "Controls and operations"
section for information about adjusting
input level.)
You may want to use high-quality preamp
cables (although noise at this point should
be
a factor because the differential
not
INPUT connectors on the TC Series ampli-
fiers are capable of rejecting radiated noise
induced in cables). If you decide to use
higher-quality preamp cables. use the type
with a shielded, twisted pair of signal wires,
if possible. The separate shield should not
be grounded at the amplifier end.
I
High-level (speaker-level)
connections
If
your head unit has low-]evel (preamp-
1)
connectors available. connect as
:ribed
in the previous section. If only
ker wires are available, connect as
:ribed here.
f
Detail: RCA pm conneclor
Solder positive
speakei
1-
Speaker
Note: only one channel
lead
to center pin.
wires
from head unit.
3
(+)
shown.
Solder each pair of speaker leads from the
head
unit
to a male RCA connector. Connect the positive lead to the center pin of the
RCA connector, and the negative lead to the
outside shield of the connector. Then attach
each RCA connector to the INPUT connectors on the TC Series amplifier. (See the
"Controls and operations" section for
information about adjusting input level.)
High-level (speaker-level)
connections
L
SPEAKEROUT
L
R
Speaker output
connections
The size and quality of the wire you use to
connect your speakers to your
amplifier can affect the sound quality of
your system. Since the lengths of speaker
leads
in
a car are relatively short, any
speaker wire of 18-gauge or larger should
perform satisfactorily. However, audiophile
speaker cables may offer better performance.
For information about connecting specific
speaker configurations, see the "Application
drawings" section of this manual.
TC
Series
Controls and operation
Bridged mono/stereo
switch
Set this switch to STEREO when you are
RCA
using both left and right
connections.
Set this switch to MONO when you are
using only the left (mono)
tor.
The TC304 has two controls, one for the
front channels and one for the rear
channels. Set these switches as described
above. depending on which input connectors you are using.
neous bridged mono/stereo satellite
operation. set this switch to STEREO.
Note:
input
RCA
connec-
For simulta-
Controls on the
and
TC300
TC600
Input sensitivity
control
WARNING:
the system for proper amplifier input
sensitivity control level, you may easily
reach amplifier output levels which can
damage speakers.
system at ltigl~ output le\vls nl/iett distortio~
is present.
Test the system for correct amplifier input
level setting by momentarily advancing and
reducing the head unit volume control to
successively higher levels as long
is
no
distortion
volume control rotation.
distortion (clipping) on a successive
increment, immediately turn down the head
unit volume control and do not operate the
unit above this level unless the amplifier
input sensitivity is changed as described in
the following sections.
When adjusting and testing
Do
not operate the
as
there
up to a maximum of
If
you hear
718
-
For standard low-level (preamplevel) inputs:
IVlUbl
""--*
head units provide a nominal low-
level
(preamp level) output signal of
)ximately 500mV. On your amplifier
aPPr(
chass
;is is a dot indicator located at the
3
o'c
lock position on the INPUT control.
The
l
...-
lNPUT control should be set to this
position for normal preamp-type head units.
If the system does not distort when tested,
and plays loudly enough, leave the INPUT
control at this setting. However, if operation is not satisfactory, or your head unit has
a non-standard output signal. use the
adjustment method described in the
following section.
For nonstandard low-level
(preamp-level) and high-level
(speaker-level) inputs:
Turn the INPUT SENSITIVITY control all
the way down to MIN (full counterclock-
wise). Select well-recorded, full-range
music that you are familiar with to use as
source material. Proceed with testing the
system by momentarily advancing and
reducing the head unit volume control in
successively higher levels as follows:
If no distortion is present and the system
plays loudly enough, leave the INPUT
control at the MIN position.
If no distortion is present and the system
does not play loudly enough, turn up the
118
INPUT control approximately
of its
rotation clockwise and retest the system
for undistorted (unclipped) output.
Proceed with successively higher INPUT
control settings until the system is loud
enough and no distortion is present. If
you hear any distortion (clipping) at a
new setting, reposition the INPUT control
to its previous test setting and leave it
there.
Note:
If the head unit is a preamp-leveltype, you may want to advance the
INPUT control in larger steps until it
12
reaches the
o'clock position to reduce
the number of test steps.
Some high-level (speaker-level) connections may result in a limitation of the usable
volume control range. In this case, you can
obtain additional range in your volume
by
control
installing a line-level adaptor,
commonly available from your autosound
dealer.
50Hz boost
equalization
Set all tone controls and equalizers to the
flat setting. Turn the 50Hz EQUALIZATION control all the way counterclockwise.
Acoustically balance your system using the
inputloutput controls and faders on the
amplifier, crossover, head unit, etc., until
you achieve the best sound. While playing
music with strong bass content, slowly turn
the 50Hz EQUALIZATION control
clockwise until the music sounds best to
you or until the amplifier is just below clipping. Caution: Use this control carefully,
since over-application of the 50Hz EQ
boost could cause more excursion motion in
your woofers than they were designed to
handle!
Indicator LEDs
The POWER LED turns on when 10-15.W
(+)
is present at the battery
REMOTE-ON terminal. This indicates that
the amplifier is functional.
The PROTECTION LED turns on if any of
the following conditions are present:
If the speaker wires are shorted.
If the speaker impedance drops below
approximately 1.5 ohms in stereo or
3
ohms in bridged mono.
If the amplifier overheats and the thermal
protection circuitry is activated.
Note:
off in under- or over-voltage conditions and
will not leak DC voltage (which could
damage speaker voice coils).
The TC Series amplifiers will turn
terminal and the
Status indicator LEDs
TC
on
series amplifier!
Q
0
POWER
0
PROTECTION
pplication
s section provides schematic wiring
grams and other drawings for many
pnmnlon system configurations. For
,
.,"I1111
iptions of these configurations, see
descri
em configurations," earlier in this
"Syst1
al. Each configuration requires a
manu
ular setting
panic
h
is noted in the drawing); see the
(whic
In titled, "Controls and operation" for
sectia
information about control settings.
more
rossover points shown in some
The c
illustr
.ations are for example only and may
not
lit your particular application.
SL
of
the "Bridge" control
drawinas
standard stereo
operation
BRIDGE
R
L
Passive
7-
Left
Speakers
+
TC600
or
TC3OO
bridged-mono
operation
BRIDGE
m
L@@
R@
L
R
+-+-
nl+l
TC600
or
TC3OO
simultane-
ous bridged-mono/stereo
Re-
operation
1
Right satellite speakers
2-ohm
minimum
(>80Hz)
TC304
(dual-stereo) operation
BRIDGE
four-channel
Front Passive
+
v
TC304
channel operation
true discrete three-
Right
satellite
-!
-
-
BRIDGE
Rear
Right
Passive
BRIDGE
El
satellite
speakers
I
-
TC304
bridged-mono/stereo
in four-channel
discrete mode
simultaneous
R
Front
-
+
Right satellite speakers
-
-
Left satellite speakers
passive
XW~
BRIDGE
El
R
Rear
L
TC304
two-channel (dual bridged-mono) operation
(See illustration
next
page
also.)
0"
Front
R
Rear
L
\
R
Rear
L
TC304
two-channel (dual bridged-mono) operation
27
INPUT BRIDGE
I
LEVEL
oo
Min
I
St
Max
CONTROL
(one set shown)
SElTNGS
50Hz
EQUALIZATION
OdB
+20dB
1304
..idged-mono/stereo operation
n
four-channel mode
with non-fading
ront-to-rear balance
dual simultaneous
I
BRIDGE
Series-Parallel and minimum
impedance speaker connection
Series-Parallel combinations of loudspeakers are used to acoustically balance systems.
In addition, by using different combinations
of series and parallel connections, you can
achieve optimum operating impedances,
which will allow vou to extract maximum
power from a given amplifier. You can also
use these combinations as a way of protecting your speakers from being overdriven
and damaged by the amplifier.
-.
TC Series amplifiers provide their highest power at their minimum impedance loading of
ohms stereo or 4 ohms bridged mono. If your amplifier is subjected to impedances in any
given frequency range that are lower than these nominal impedance minimums, your
amplifier will eventually activate its protection mode and temporarily shut off. To determine minimum impedances, consider the combined impedances of all speakers operating in
each frequency range.
Series
R
1
+
R2 = combined impedance.
For example, if
speakers, the combined impedance is:
4+4=8ohms.
R 1 and
R2
are both 4-ohn
Parallel
RI X R2
-
RI
For example, if
speakers, the combined impedance is:
+
=
combined impedance
R2
R 1 and
R2
are both 4-ohm
2
The
TC
Series simultanous bridged mono/stereo satellite operation demonstrates this
minimum impedance concept, as these diagrams illustrate:
-~
~
Improper impedance loading
Len
satellite
2-ohm min~mum
If
the left and right satellite speakers are 2 now see 1 ohm per channel in the combined
speakers
Proper impedance loading
2-ohm minimum
Separating the operating ranges of the
ohms and operated full-range, the amplifier woofer/satellite operating range, thereby satellites and woofer with a passive cross-
would see a proper impedance load. How- eventually triggering the amplifier's over filter as shown in the above example
ever, if a
bridged across the left and right channels looks like a 2-ohm load per channel to
without a crossover filter, the amplifier will amplifier).
4
ohm subwoofer is additionally protection mode (a 4-ohm bridged load will provide a proper minimum impedance
an
load of 2 ohms stereo above
4
ohms bridged mono below
8OHz
80Hz.
and
30
Troubleshooting checklist
Most of the problems experienced by customers are due to installation or operational problems.
pected. first check the items in this checklist. Also check other related components, such as head units, equalizers. crossovers, speakers,
and other electrical equipment used with your amplifier. If you still have difficulties in normal operation, please contact an authorized
Harman Kardon service center.
If
your amplifier does not operate as ex-
Problem Cause Remedy
No sound. Power LED does not light.
No sound. Power and Protect LEDs are
immediately upon turn-on.
Amplifier plays for a short time, then no
sound. Power and Protect LEDs are on. openings.
3
1
lit
No 12V (positive) at
Remote-on terminal not receiving +12V Check remote-on connections.
from head unit.
Power ground connection(s) (negative) is Check power grounds.
poor.
Car battery voltage is below 9V or above Check condition of car battery and
16V. charging system.
Speaker or speaker wire shorted.
Fan openings restricted or in "dead air." Ensure clear air paths in and out of fan
Combined minimum speaker impedance Reconfigure speakers and crossovers for
is too low.
B+
terminal.
Check power connections and fuses.
Check speaker wiring and speakers.
minimum impedance load (see "SeriesParallel and minimum impedance speaker
connect ion").
Problem Cause Remedy
Amp plays clearly but not loud enough at Input control adjusted too low.
high head unit volume control settings.
Amp plays clearly at low to moderate head Speakers are not rated for higher power
unit volume control settings, but sound and cannot handle the amplifier's output. handle higher power and/or readjust
distorts at high volumes. INPUT control counterclockwise.
Input control is adjusted too high and Readjust input level control counterclock-
amplifier is clipping.
Readjust input control (see "Controls and
operation").
Upgrade speakers to a model that can
wise to eliminate clipping (see "Controls
and operation").
Fan reversal for multiple amplifier installations
In some installations,
mount two or more TC Series amplifiers
one after another in a line. You can reverse
the fan in any amplifier to reverse the
direction of air flow through the tunnel; this
enables you to prevent the warm air from
the first amp from being vented into the
tunnel of the second amp. and so on.
From the factory, the fan pulls air through
the tunnel and exhausts the warm air at the
fan end when music is playing. This
direction of air circulation provides the best
cooling for a TC Series amplifier. Leave
I
TC304
screw locations
it
may be desirable to
TC600 and TC300:
TC304:
the amplifier(s) that will be driven the
hardest (usually the bass frequencies) in the
factory configuration, and only reverse the
cooling direction on the amplifiers with the
lighter load.
tion, the fan hub label is positioned toward
the outside of the amplifier.
To reverse the direction of the air flow, the
fan itself must be reversed in its mounting
(the fan is electrically controlled, and
simply reversing power to the fan will not
change its direction). Contact any author-
ized Harman Kardon installer or service
Note:
In the factory configura-
5
large, 1 small RCA
5
large, 2 small RCA
center to perform the fan reversal, and take
this manual with you.
To reverse the direction of air flow through
the tunnel:
I.
Carefully remove the screws attaching
the fan end cap of the amplifier (see
illustration for location of screws).
2.
Gently remove the end cap just far
enough to allow removal of the fan from
its mounting pins in the end cap. DO
NOT REMOVE THE WIRES.
3.
Flip the fan assembly
in the opposite direction. Make sure the
rubber insulation pads are still in place on
both sides of the fan. The wires are
attached to the circuit board, and the fan
stays with the end cap, so
to stretch or damage the wires.
4.
Replace the end cap assembly and
screws. DO NOT OVERTIGHTEN THE
SCREWS.
180°
so that it faces
be
careful not
Specifications
60
Power output. RMS
HCC (High Instantaneous
Current Capability)
THD (4ohmsT)?ohms)
Negative Feedback
Frequency response
Signal-to-noise ratio (referred to rated power)
lnput sensitivity
Continuously variable (line-level
to high-level)
lnput impedance
Center pin conneclor
Outside shield
Power supply
Tv~ical current reauiremenls
-.
At idle
Full-power music signal
Full-power sine wave
Dimensions
Weight
All specifications and features subject to change wiChout notice.
(L
X
W X H)
(+)
(-)
watts conlinuous power
X
2 channels @ 4ohms
2OOW
X
2
3OOW
X
I channel @ 4ohms
600W
No more than 0.1%10.2%
25dB
lOHz to I00.OoHz +O. -3dB
loodB
DC
+14.4V (9-16V usable), negative ground
channels @ 2ohms
300 watts continuous power
X
2 channels @ 4ohms
IOOW
X
2
150W
3OOW
f50A
No more than 0.1 %/0.2%
25dB
lOHz to IOO.OoHz +O. -3dB
IOOdB
0.25V to 2.5V
DC
4.OA
IOA (4ohms/channel)
15A (2ohmslchannel)
30A (4ohmslchannel)
45A (2ohmslchannel)
channels @ 2ohms
X
I
channel @ 4ohms
+14.4V (9-16V usable). negative ground
300 wans continuous power
X
4 channels @ 4 ohms
50W
X
4 channels @ 2ohms
75W
X
2
channels @ 4ohms
50W
+
150W X 1 channel @ 4ohms
X
2 channels @ 2ohms
75W
+
150W
X
I
channel @ 4ohms
X
2
channels @ 4ohms
150W
No more than 0.1%/0.2%
25dB
l
OHz to I 00,OOOHz +0. -3dB
loodB
DC
+14.4V (9-16V usable), negative ground
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