Theater Grand
Amplifier
TGA-7400 / TGA-7400(E)
and TGA-7200 / TGA-7200(E)
seven
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SAFETY
16. To prevent electric shock, do not 17. Grounding or Polarization —
ATTENTION — Le présent appar-
eil numérique n'émet pas de bruits
radioélectriques dépassant las limites
applicables aux appareils numériques
de class A/de class B (selon le cas)
prescrites dans le règlement sur le
brouillage radioélectrique édicté par
les ministere des communications du
Canada.
use this polarized plug with an exten-
sion cord, receptacle or other outlet
unless the blades can be fully inserted
to prevent blade exposure.
Pour préevenir les chocs électriques
ne pas utiliser cette fiche polariseé
avec un prolongateur, un prise de
courant ou une autre sortie de cou-
rant, sauf si les lames peuvent être
insérées à fond sans laisser aucune
parIIIe à découvert.
Precautions should be taken so that
the grounding or polarization means
of the Component is not defeated.
This apparatus does not exceed the
Class A/Class B (whichever is ap-
plicable) limits for radio noise emissions
from digital apparatus as set out in the
radio interference regulations of the Ca-
nadian Department of Communications.
WARNING – TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION: TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE
OF PLUG TO WIDE SLOT, FULLY INSERT.
ATTENTION: POUR ÉVITER LES CHOCS ÉLECTRIQUES, INTRO-
DUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE
CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU’AU FOND.
Contents
Please read the Safety Instructions
Safety Instructions................................... 2-3
carefully before connecting and
using your Sunfire Amplifier.
Chapter 1: Introduction ...............................4
Theater Grand Editions ..............................5
Unpacking and Installation .........................6
Front Panel Features..................................7
Rear Panel Features ..................................8
Chapter 1 is a general introduction
to the features, details and installa-
tion of your amplifier.
Chapter 2 shows some typical con-
nections to a preamplifier and
speakers.
Chapter 2: System Configurations...........10
The Appendix shows some addition-
al information, including a trouble-
shooting guide, the Warranty, and
service assistance details.
Appendix:
Series and Parallel ...................................15
Troubleshooting Guide .............................16
Specifications ...........................................18
Limited Warranty ......................................19
Service Assistance ...................................19
To find out more about this and other
Sunfire products, please visit our
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CHAPTER 1
Introduction
Bob Carver, Amplifier Designer, Physicist
Dear Friend,
Thank you for purchasing a Sunfire Theater Grand Amplifier. We hope you enjoy it and the music it
makes as much as we have enjoyed creating it for you.
The TGA-7400 can produce 400 watts rms per channel into 8 ohms and 800 watts rms into 4
ohms.
The TGA-7200 can produce 200 watts rms per channel into 8 ohms, and 400 watts rms into 4
ohms.
The big breakthrough is the uncanny tracking downconverter, which uses 18 Herculean Mosfets
in the TGA-7400 and the TGA-7200. This allows the amplifier to produce phenominal power output,
without the heat generated by conventional designs.
The circuit boards are heavy glass epoxy, double sided, with a Faraday shield on the back side. All
resistors in the signal path are 1% tolerance, metal-film. Critical capacitors are film devices with high
dielectric strength and ultra low absorption characteristics. An enormous power source built around a
massive power transformer provides the ultimate muscle for limitless dynamics.
We could go on and on, but here’s the best part: we’ve included two kinds of outputs on the front
left and front right channels:
(1) a standard voltage-source (i.e., near zero impedance) output for all typical applications and:
(2) a higher-impedance current-source output, which many prefer for electrostatic, planar
magnetic, or ribbon speakers. Or you can biwire your system with the voltage source driving
the woofer(s) and the current source driving the upper part of the system. In many cases this
provides by far the best possible interface between the amplifier and the speaker system.
Whichever way you decide to hook up the amplifier, it will create a multilayered soundstage that is
deep, wide, three-dimensional, and utterly believable. The optional current-source output can coax
forth a sensuous, delicately detailed musical voice long associated with low-powered classic tube
amplifiers. (The current-source characteristic of vacuum tubes is the dominant factor in the sound-
stage delivery of classic tube amplifiers).
4
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CHAPTER 1
Theater Grand Editions
The Theater Grand seven chan-
nel power amplifier is available in two
editions:
TGA-7400 and TGA-7400(E)
400 Watts per channel into 8 Ω
800 Watts per channel into 4 Ω
•
•
TGA-7400
TGA-7200
The TGA-7400 has twice the power
output, and uses heavier output ter-
minals compared to the TGA-7200.
This manual uses illustrations of the
TGA-7400. The operational details,
features, and connections to loud-
speakers and preamplifiers are the
same for both models.
The TGA-7400(E) and TGA-
7200(E) are export models, set for
220-240 VAC operation. Their opera-
tion is identical to the TGA-7400 and
TGA-7200 amplifiers.
TGA-7200 and TGA-7200(E)
200 Watts per channel into 8 Ω
400 Watts per channel into 4 Ω
5
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CHAPTER 1
Unpacking
Installation
Your Sunfire Amplifier should reach
you in perfect condition. If you do
notice any shipping damage, please
contact your Sunfire Dealer immedi-
ately.
Read and follow all safety instruc-
tions shown on pages 2 and 3.
•
Make sure that the power
cords of all your components
are attached to the same outlet
or at least to the same circuit.
This will reduce the possibility
of a ground loop in the system.
Observe the following precautions
when choosing a location for your
Theater Grand Amplifier:
Gently lift out the unit and remove
all the packing material and acces-
sories. It is important to save all the
packing materials and the box in case
your amplifier ever needs to be moved
or shipped for repair.
•
•
Protect it from prolonged
exposure to direct sunlight and
other direct sources of heat,
such as heating vents and
radiators.
Make sure that the total cur-
rent draw does not exceed
the current rating of your AC
outlet or power strip.
•
•
Use the XLR inputs if your
preamplifier has XLR outputs.
These balanced connections
provide superior noise rejec-
tion.
Do not expose the unit to rain
or moisture. If fluid or a foreign
object should enter the unit,
immediately unplug the power
cord and contact your Sunfire
Dealer.
Make sure that you keep your sales
receipt. It is the only way to establish
the duration of your Limited Warranty
and it may come in useful for insur-
ance purposes.
Whenever possible, keep the
power cords away from the
signal cables or speaker wires
to prevent any hum or audio
interference being heard in the
speakers.
Please take a moment to fill out and
mail the Sunfire Customer Response
card. Also read the serial number
located on the rear panel or the under-
side of the chassis and record it here:
•
•
•
Avoid excessive exposure to
extreme cold or dust.
Do not place heavy objects on
top of the unit.
•
•
Choose reliable hookup cables,
also called patch cords or RCA
cables. They should be fully
shielded and as short as pos-
sible for the job.
Allow adequate ventilation
around the amplifier; do not
cover the ventilation slots.
Serial #:
___________________________
Purchased at:
AC Power Considerations
Ensure that the unit is plugged into
an outlet capable of supplying the cor-
rect voltage specified for your model.
The outlet should be capable of sup-
plying 15 amps for the 120 V model,
8 amps for the 230 V model.
Some patch cords can be a
very tight fit and there is usu-
ally a preferred method of get-
ting them off. Some have to be
removed with a twisting action.
Be gentle or you may damage
the jacks of the amplifier or
your other components.
___________________________
___________________________
___________________________
___________________________
Date: _______________________
Care
If you need to clean the front sur-
face, first turn off the power and then
use a dry soft cloth, rubbing with the
grain. Be careful not to scratch the
display window.
•
•
Some special patch cords
can only be hooked up in one
direction, these are usually
marked with arrows.
It is usual for the right patch
cord plugs to be red and the
left connections to be white,
grey or black. Video connec-
tions are usually yellow.
Connection Tips
Before setting up your new system,
please consider the following :
Always make sure that
your components are all
unplugged before making or
changing connections.
6
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CHAPTER 1
Front Panel Features
Overview
Power Switch
Your Theater Grand Amplifier has
seven channels of power amplifica-
tion combined in one chassis for the
Press the power switch to turn the
amplifier on. With this switch pressed
in, the “Standby/On” LED will turn
purpose of reproducing music or video red when the amplifier is in standby,
soundtracks. It accepts line level
signals from a controlling preamplifier
and amplifies them to a higher level,
suitable for driving powerful stereo
and Home Theater speakers.
or blue when the amplifier is on. The
rear panel switch controls how the
amplifier turns on (signal sensing, 12V
trigger, etc.). Please refer to page 8
for more details.
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CHAPTER 1
Rear Panel Features
1 2
3 4
5
6
6
5
6
MINIMUM SPEAKER LOAD IMPEDANCE 4 OHMS
7 6
6
6 7 6
8 9
The voltage range for the trigger
input is from 5 to 18 VDC. The input
impedance is approximately 600 Ω
(20 mA @ 12V).
1. AUTO/ON/OFF Switch
Your Theater Grand Amplifier is
designed with an automatic on/off
circuit.
2. 12 VDC Trigger Input
Although the AUTO-ON signal
sensing turn-on is adequate for most
installations, the 12 VDC trigger inputs
are offered as an optional way to turn
on the amplifier.
3. RCA Inputs
•
In the AUTO-ON position, the
amplifier will automatically turn
on if an audio signal is pres-
ent at any of the inputs, or if it
receives a 12 VDC input volt-
age at the trigger inputs. The
amplifier will automatically turn
off after a few seconds if the
trigger voltage is removed, or
after approximately 30 minutes
in the absence of an audio
signal.
Your Theater Grand Amplifier has
three sets of inputs for each of the
seven channels. Two are unbalanced
RCA inputs and one is a balanced
XLR type.
The Sunfire Theater Grand II, III, IV
and TGP-5 Processors have a com-
patible 12 VDC trigger output (see
page 11). This can be used to auto-
matically turn on the amplifier when
the processor is turned on.
The two RCA inputs for each chan-
nel are joined together internally, and
either one can be connected to the
corresponding output of your pream-
plifier.
1/8" mono mini jacks are provided
for ease of installation, along with a
terminal strip to allow more flexibility
for custom-wired installations. The
terminal strip and both mini jacks are
internally connected in parallel, allow-
The second RCA input can be used
as a daisy-chaining output, sending
the preamplifier output signal to an-
other channel or to another amplifier.
•
•
•
In the ON position, the ampli-
fier is always on, regardless of
input signals or 12 VDC trigger. ing 'daisy chaining' to turn on multiple
amplifiers.
In the OFF position, the ampli-
fier is always off, regardless of
input signals or 12 VDC trigger. interconnect cable will suffice to con-
Any 1/8" miniplug mono or stereo
nect the trigger output of the Theater
Grand Processor to the amplifier.
See page 7 for details of the
front panel LED status.
Do not exceed 18 VDC on
this input. (CAUTION: Do
not connect AC line voltage
to this input!)
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CHAPTER 1
NOTE: The Current Source output
is a Voltage Source modified to yield
an impedance of one ohm. This cor-
responds approximately to a vacuum
tube amplifier's output impedance and
constitutes the dominant factor in the
soundstage delivery of classic vacuum
tube power amplifiers.
4. XLR Inputs
5. Current Source Outputs
and:
6. Voltage Source Outputs
The front left and front right chan-
nels each have a Voltage Source
output and a Current Source output.
The remaining channels have Voltage
Source outputs only.
If your preamplifier has XLR
outputs, connect them to these XLR
inputs. These balanced connections
offer superior noise rejection com-
pared to the unbalanced RCA inputs,
particularly for long cable runs.
The female XLR inputs are wired
as follows:
7. Current Source Fuses
Each Current Source output has an
in-line fuse to protect your speakers.
If one ever opens, there will be no
output to that speaker.
The Voltage Source outputs have
a source impedance of approximately
zero ohms. The Current Source
outputs have a source impedance of
approximately one ohm.
Pin 1 is ground
Pin 2 is positive (hot)
Pin 3 is negative (cold)
Unplug the amplifier from
the AC mains power supply
if you ever have to change
a fuse.
Balanced connections pass the
input signal along two conductors. If
there is any external noise and inter-
ference passing into the audio lines,
both conductors will receive the same
amount of noise. This noise is then
rejected in the balanced input stage of
the Theater Grand Amplifier.
The top post of each binding post
pair is the positive output, and con-
nects to the positive (red) post of your
speaker. The bottom post of each pair
is the negative, and connects to the
negative (black) post of your speaker.
The posts can accept bare wire,
spade terminals, and dual or single
banana connectors.
8. IEC connector
The amplifier comes with a detach-
able Linecord which attaches here.
Make sure it is firmly pushed in place.
Connect the other end to an AC outlet
which is properly configured for the
type of plug and has the correct volt-
age for your model.
+
-
+
-
9. AC Line fuse
If this fuse fails, replace it with the
exact same type and current rating.
Bare Wire
Spade
Note: Always unplug the
power cord from your AC
outlet before removing the
fuse.
+ -
Dual-Banana
Banana
+ -
With a flat ended screwdriver, push
the fuse carrier in slightly and turn it
counter-clockwise to release.
According to your musical taste,
you may select the Current Source for
driving electrostatic, planar magnetic
or ribbon speakers. Select the Volt-
age Source for driving subwoofers.
For cone based systems, use either.
For a biwired system, use the Current
Source for midrange and treble driv-
ers, and use the Voltage Source for
the subwoofer(s). These are sugges-
tions only. By all means, please feel
free to experiment with other wiring
options. (See page 14.)
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CHAPTER 2
System Configurations
The following pages show some typical connections that you might make in your installation. They show how the inputs
and outputs of the Theater Grand Amplifier are connected to your preamplifier and speakers.
Unbalanced Connections
UNBALANCED
PREAMP OUTPUTS
RB
LB
RS
LS
RF
LF
C
Line-level audio signals
From: Preamplifier main RCA outputs
To:
Amplifier line-level inputs
MINIMUM SPEA
KER LO
AD IM
PED
ANCE
4
OHMS
+
RB
+
+
+
+
+
R
+
Speaker-level audio outputs
From: Amplifier outputs
To: Speaker input posts
RS
C
LS
LB
LOUDSPEAKERS
L
Make sure that the posi-
tive speaker wires do not
touch the negative speaker
wires, or any chassis metal.
R
C
L
= Right Channel
= Center Channel
= Left Channel
If your preamplifier has RCA out-
puts, it can be connected to the ampli-
fier inputs as shown. The amplifier will
boost the preamplifier's output, up to a
level suitable for driving speakers.
RS = Right Surround (rear) Channel
LS = Left Surround (rear) Channel
RB = Right Surround Back Channel
LB = Left Surround Back Channel
This will cause a short circuit and may
damage your amplifier or speakers.
This diagram also shows how the
Voltage Source outputs connect to
the input posts of your speakers. (The
Current Source can be used instead,
as shown on the next page).
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CHAPTER 2
Balanced Connections
If your preamplifier has XLR outputs, it can be connected to the XLR inputs as shown. This example shows the connec-
tions to the Sunfire Theater Grand Processor TGP-5. This also shows the Current Source output connections to the front
left and right speaker inputs. (The Voltage Source outputs can be used instead, as shown on the previous page.)
Sunfire Theater Grand Processor TGP-5
MANUFACTURED
FRO
U
NDER LICENSE
M
DOLB
Y LAB
OR
ATORIES.
"DOLBY", "PRO-LO
DOUB
GIC"
ARE
A
ND
THE
LE-D SYMBOL
TRADEMARKS
LABOR
O
F
D
OLBY
ATORIES.
L
LS
C
LB
R
RS
SW
RB
DV
D
I
N
SA
FROM DIGITAL
T
IN
MANUFACTURED UNDER LICENSE
SYSTEMS, INC. US PAT. NO. 5,451,
5,978,762 AND OTHER WORLD-W
PENDING. "DTS",
"NEO:6" ARE TRA
SYSTEMS, INC. COPYRIGHT 1996, 20
SYSTEMS, INC. ALL RIGHTS RESERVED.
HDMI OUT
T
HEATER
942, 5,956,674, 5,974,380,
IDE PATENTS ISSUED AND
"
DTS-ES EXTENDED
SURROUND" AND
DEMARKS OF DIGITAL THEAT
ER
00, DIGITAL THEATER
12 VDC Trigger signal
From: Preamplifier trigger
outputs
To:
Amplifier trigger
inputs
LB
LS
L
RB
RS
R
C
MINIMUM SPEAKER LO
AD IMPED
ANCE
4
OHMS
Balanced line-level audio signals
From: Preamplifier XLR outputs
To:
Amplifier XLR inputs
+
R
+
RB
+
RS
+
Speaker-level audio outputs
From: Amplifier outputs
+
LS
+
L
C
+
LB
LOUDSPEAKERS
To:
Speaker input posts
The 12 VDC trigger connection
shown can be used to turn the ampli-
fier on when the preamplifier turns on.
Alternatively, you could use the ampli-
fier's AUTO-ON switch. The amplifier
will then automatically turn on when a
preamp audio signal is received.
11
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CHAPTER 2
Biamping
If your speakers can be biamped,
the Theater Grand Amplifier can be
configured to provide a very powerful
system.
The following connections are
shown in the diagram on the top half
of the next page.
Output connections
•
Connect the amplifier’s right
rear output to the right speak-
er’s woofer input terminals.
Connect the amplifier’s right
front current source output to
the right speaker’s upper range
input terminals. If you prefer,
you could use the right front
voltage source instead.
Inputs
Tweeter
•
Connect the amplifier’s left
rear output to the left speaker’s
woofer input terminals.
Connect the amplifier’s left
front current source output to
the left speaker’s upper range
input terminals. If you prefer,
you could use the left front
voltage source instead.
Woofer
A speaker which can be biamped or
biwired will have two sets of binding
posts. Sometimes these posts are
joined with bridge clips for normal
operation.
Input connections
Each amplifier channel has two
RCA inputs which are connected
together internally.
Make sure that any bridge
clips are removed when
biamping or biwiring the
speakers. If not, this may
cause damage to the
amplifier.
•
Connect the preamp stereo
output to the front channel
RCA jacks. Then install short
interconnects from the other
unused front RCA jacks across
to the rear channel RCA jacks.
In this way, the front and rear
amplifier channels are fed with
the same signal from your
preamp.
Each speaker can be driven by two
amplifier channels; one to drive the
woofer and one for the upper range.
You will need to use four amplifier
channels to biamp two speakers.
If you use the Theater Grand Ampli-
fier for biamping, then a total of five
speakers can be connected. You will
need an extra two channel amplifier
if you want to run the surround back
speakers in a 7.1 channel Home The-
ater system.
•
Note: you cannot use XLR
cables in, with RCA out, or
RCA in with XLR out. There is
no direct internal connection
between the RCA and XLR
inputs.
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CHAPTER 2
Biamping Connections
UNBALANCED
PREAMP OUTPUTS
L
R
Note: The remaining channels can
be used to drive other speakers, or
left unconnected. These connections
have been omitted from this drawing
and the one below for clarity. They
can be connected as shown on pages
10 and 11.
Line-level audio signals
From: Preamplifier main RCA outputs
To:
Amplifier RCA inputs
MIN
IM
UM
S
PE
AKER LO
AD IMP
EDA
NCE
4
O
HMS
Line-level audio signals
From: Amplifier Front L/R RCA
To:
Amplifier Rear L/R RCA inputs
Speaker-level audio outputs
From: Amplifier outputs
+ -
TWEETER
(CURRENT
SOURCE)
+ -
RIGHT
To:
Speaker input posts
+ -
LEFT
OOFER
RIGHT
+ -
LEFT
TWEETER
(CURRENT
W
OOFER
W
LOUDSP
EAKERS
SOURCE)
UNBALAN
Biamping with an external
crossover
CED
PREAMP
OUTPUTS
R
L
If you have an external active
crossover, you can greatly increase
the efficiency of your system. The
crossover will split the preamplifier
output signals into two frequency
ranges.
FULL FREQ
RANGE
A
CTIVE EXTERNAL C
R
O
SSO
VER
INPUT
LO
W OUT
HIGH OUT
R
L
You can connect the crossover's
low frequency outputs to the ampli-
fier's rear channel inputs, and the
crossover's higher frequency outputs
to the amplifier's front channel inputs.
R
L
R
L
LO
W FREQ
RANGE
HIGH FREQ
RANGE
This is an efficient system because
the channels only amplify signals with-
in the frequency range of the speaker
element they are driving. Little power
is wasted.
MINIMUM
SPEAKE
R
LO
AD IMPE
DA
NCE
4
OHMS
Make sure that the crossover point
of your active crossover is adjusted
to match the crossover point of your
speakers. Consult your speaker and
crossover owner's manuals.
+ -
TWEETER
(CURRENT
SOURCE)
+ -
RIGHT
+ -
RIGHT
+ -
TWEETER
(CURRENT
SOURCE)
LEFT
W
OOFER
LEFT
W
OOFER
LOUDSPEAKERS
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CHAPTER 2
Biwiring Connections
If your speakers can be biwired or
biamped, they will have completely
separate input terminals for the woofer
section and the upper range. See the
speaker diagram and discussion on
page 12.
UNBALANCED
PREAMP OUTPUTS
L
R
Make sure that any links be-
tween the woofer and upper
range posts are removed
from the speakers when
Line-level audio signals
From: Preamplifier main RCA outputs
To: Amplifier line-level inputs
you want to biamp or biwire them.
Consult your speaker owner’s
manual for details.
The front channels of the Theater
Grand Amplifier each have two pairs
of outputs which can be used to biwire
your speakers. The idea is to use the
voltage source to drive the woofer,
and the current source to drive the
upper range. This will offer improved
performance and still allow you to con-
nect seven speakers for your Home
Theater system.
MINIM
UM
SPEAKE
R
LO
AD IMPE
D
A
NCE
4
OHMS
Speaker-level audio outputs
From: Amplifier outputs
To:
Speaker input posts
This page shows the input and out-
put connections for Biwiring a left front
speaker and a right front speaker.
The remaining speaker connections
have been omitted from this drawing
for clarity. They can be connected as
shown on pages 10 and 11.
+ -
TWEETER
(CURRENT
SOURCE)
+ -
RIGHT
RIGHT
+ -
TWEETER
(CURRENT
SOURCE)
W
+ -
OOFER
T
A
LEFT
(V
OL
LEFT
GE
SOURCE)
Output connections
W
OOFER
(V
OL
T
A
GE
SOURCE)
•
Connect the amplifier’s right
front voltage source output
to the right speaker’s woofer
input terminals. Connect the
amplifier’s right front current
source output to the right
speaker’s upper range input
terminals.
LOUDSPEAKERS
Input connections
Connect your preamplifier’s outputs
to the corresponding input jacks on
the Theater Grand Amplifier.
•
Connect the amplifier’s left
front voltage source output to
the left speaker’s woofer input
terminals. Connect the ampli-
fier’s left front current source
output to the left speaker’s
upper range input terminals.
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APPENDIX
Series and Parallel speaker connections
The connection of more than one
speaker per channel will tend to
degrade the speaker’s frequency
response, and may make the amplifier
Parallel
For example, if you want to parallel-
connect two speakers to the front right
•
•
Ideally, the total average
impedance should be no less
than 4 ohms per channel.
channel of the amplifier:
run hot. For the best results use one
speaker per channel.
You must make sure that the
lower impedance does not
cause the amplifier to over-
heat, shut down, blow the line
fuse, or pop your circuit break-
er. If this happens, you should
reduce the number of speakers
wired in parallel, rewire them in
series, or use more than one
power amplifier.
If you do want to connect more than
one speaker per channel, there are
two main ways: Series or Parallel.
Amplifier
Outputs
Series
For example, if you want to
series-connect two speakers to the
front right channel of the amplifier:
•
•
The positive output terminal of
the right channel connects to
the positive input post of the
first speaker and to the positive
post of the second speaker.
Amplifier
Outputs
The negative output terminal
of the right channel connects
to the negative input post of
the first speaker and to the
negative post of the second
speaker.
•
•
•
•
The positive output terminal of
the right channel connects to
the positive input post of the
first speaker.
•
The total impedance of equal
speakers in parallel is found
by dividing the impedance of
one speaker by the number of
speakers. For example, two
eight ohm speakers in parallel
is a four ohm load (eight ohms
divided by two), four eight ohm
speakers in parallel is a two
ohm load (eight ohms divided
by four).
The negative input post of the
first speaker connects to the
positive input post of the sec-
ond speaker.
The negative input post of the
second speaker connects to
the negative output terminal of
the right channel.
The total impedance of speak-
ers in series is found by adding
their impedances together. For
example, two four ohm speak-
ers in series is an eight ohm
load.
•
Parallel connections are harder
on the amplifier than series
connections, as the total im-
pedance is lower compared to
driving a single speaker, and
the amplifier must produce
more current to drive them.
•
Series connections are easier
on the amplifier than parallel
connections as the total imped-
ance is higher than driving a
single speaker.
15
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APPENDIX
Troubleshooting Guide
The Sunfire Amplifier is expertly
designed and built to provide years of
trouble-free performance. Most prob-
lems that occur can usually be solved
by checking your setup or making
sure that the audio and video com-
ponents connected to your processor
are on and fully operational.
•
Try to have all of your equipment
on the same electrical outlet or
circuit. Group all the low power
components (preamp, CD player,
DVD etc.) on a single outlet or
power strip. This is provided that
the overall current draw from your
equipment does not exceed the
rating of the outlet or breaker.
The amplifier shuts down
often or the line fuse blows
often
•
Check that the positive and nega-
tive speaker wires are not shorted
together.
•
Make sure that no speakers are
shorted internally. If you have an
ohm-meter, disconnect the speaker
wires and measure the resistance
between the speaker’s positive
and negative terminals. If the read-
ing is less than 2 ohms, the speak-
ers may have an internal short.
Measure all speakers and check
their impedance specifications.
The following information will help
you deal with common setup problems
you may experience during normal
use of your unit. If the problems still
persist, please contact your Sunfire
Dealer for assistance.
•
Disconnect all cables which come
from outside the room, and check
if the hum goes away. This in-
cludes such connections as cable
TV, satellite TV, or roof top an-
tennas. Make sure that they are
disconnected where they first enter
the room, so they are making no
connection to the preamplifier or
the TV, or any other component. If
the hum is caused by the cable TV
line, then you will need a “ground
loop isolator.” This is an inexpen-
sive device fitted in line with the
coaxial cable feed. Contact your
cable company or your Sunfire
Dealer for assistance.
No sound from one or
more speakers
•
Speaker cables may have come
undone. Turn off your system and
check the cables, and tighten the
amplifier and speaker binding
posts.
•
•
If you have connected speakers
in Parallel, the overall impedance
may be too low. It is recommended
that you rearrange the speakers
in Series to increase the overall
impedance, thus taking some of
the load off the amplifier.
•
•
Broken audio cable.
The preamplifier volume level is
low for the channels concerned.
Recheck the preamplifier calibra-
tion procedure.
Make sure that the amplifier
has good ventilation and is not
overheating. If the amplifier is in
a closed rack, open up the rear
panel or use a quiet fan for im-
proved ventilation.
•
•
Disconnect all connections from
the preamplifier to your TV, VCR or
DVD.
•
•
A preamplifier Mute switch may be
on, or an external processor loop
or a tape monitor loop is engaged.
As a test, disconnect any other
component which has a grounded
power cord.
A hum is heard in your
speakers
This problem is more than likely
caused by a “ground loop” in your sys-
tem, rather than a fault in the amplifier.
Follow these steps to isolate the main
cause of the hum; there may even be
more than one.
Check that your preamplifier or
source is running the correct sur-
round sound mode. Maybe it is set
for stereo when you were expect-
ing 5.1 surround sound.
NOTE: Never remove the
ground pin from any power
cords. This is very dan-
gerous.
•
•
•
If the hum persists, disconnect all
the source components one at a
time from the back of the preampli-
fier, until you identify the problem.
•
Check in case any missing chan-
nels have been turned off in a
preamplifier setup menu. For
example, the center amplifier
channel will not receive a signal
if the preamplifier has been set to
"Phantom."
•
If your preamplifier has XLR bal-
anced outputs, use them because
they offer greater immunity to
noise fields.
Ground loop isolators are available
for audio lines and video. You can
ask your Sunfire Dealer for assis-
tance.
•
•
The Auto/on/off switch might be in
the off position.
•
Remember to unplug all compo-
nents in your system, including
the amplifier, before disconnecting
or connecting any cables during
troubleshooting.
Try moving the speaker cables
away from any power cords. Try
just one speaker, connecting it to
each amplifier channel and see if
one channel is bad.
One of the fuses for the current
source outputs may have blown.
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APPENDIX
•
Check that the interconnect cables
to the amplifier do not have any
broken connections.
Poor bass performance
•
Make sure that your preamp does
not have the bass level turned
down.
Other causes of noise
•
•
Many surround preamplifiers have
controls which can direct all the
bass to subwoofers, or let your
main speakers play the full range.
Make sure that the preamplifier
has been correctly set. If you are
not using a subwoofer, set the
speaker options to “LARGE,” and
the subwoofer to "OFF."
Speaker noise may also be caused
by interference or noise on your
AC line. Make sure there are no
large appliances sharing the line,
or halogen lamps or lamps with
dimmer controls.
•
•
•
•
Try connecting your system to an-
other AC socket on a separate line.
Keep power cords away from au-
dio cables.
•
Check that the speaker wires have
been connected correctly: Make
sure that the positive of each
Do not place the preamplifier di-
rectly on top of the amplifier.
speaker connects to a positive out-
put of the amplifier, and the neg-
ative of each speaker connects to
a negative output. If one speaker is
wired incorrectly, than it will be “out
of phase” with the others, resulting
in poor bass performance.
If the hum is heard from within
the amplifier and not through the
speakers, this may also be caused
by interference on the AC or DC
lines. The power transformer
may turn this interference into an
audible noise. Internal hum can be
made worse by a shelf or cabinet
resonating, so try moving the am-
plifier to another shelf.
•
If you have connected the amplifier
using the XLR inputs, make sure
that the XLR cables are wired cor-
rectly. If one has the hot and cold
reversed, then this will also cause
a speaker to be out of phase.
•
•
Try moving your preamplifier
further away from your amplifier.
Sensitive preamp circuits may pick
up hum from the amplifier trans-
former’s magnetic field.
Turn-on and turn-off
thumps
•
Plug the amplifier into an
unswitched AC outlet, and use the
AUTO-ON feature. This will allow
the amplifier to turn on and off
silently.
Try moving your components further
away from the TV, especially if
you ever notice the screen has
changed color in the area closest
to the component.
Current source outputs not
working
•
•
If you have very high efficiency
speakers, these may show up
noise which other speakers may
not.
•
If you are biamping or biwiring,
make sure that the current source
fuses have not blown.
If you are still having a problem,
remember that Sunfire’s dealers
and technical support staff will as-
sist you. Make a list of the things
you have tried.
17
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APPENDIX
Specifications
Input sensitivity for rated
output
12 VDC Trigger Inputs
Input voltage range 5 -18 VDC
TGA-7400
Impedance: approx 600 Ω
Unbalanced: 1.34 Vrms
(20 mA @ 12 V)
Balanced:
0.67 Vrms
Power output
Removable terminal block, and
dual 1/8" minijacks for daisy-chain-
ing.
400 watts continuous, per chan-
nel, into eight ohms, at 1 kHz
with no more than 0.5% T.H.D.
XLR Input impedance
10 kΩ, each leg balanced to
ground
Power Consumption
Power at clipping, min
Female XLR
45 W
At idle
800 watts per channel into four
ohms.
Pin 1 is ground
Pin 2 is positive (hot)
Pin 3 is negative (cold)
580 W
1800 W
Typical (1/8th power)
Absolute Max (Fuse
Limit)
Hum and Noise
Damping Factor:
-118 dB, A-Weighted
Dimensions and Weight
150
Maximum output current
17.0 inches wide
5.9 inches high (including feet)
16.7 inches deep (to tips of con-
nectors)
12 VDC Trigger Inputs
120 amps peak to peak per ch.
Input voltage range 5 -18 VDC
Maximum output voltage
Impedance: approx 600 Ω
Weight 40 lbs
56.6 Vrms
(20 mA @ 12 V)
Finish
Removable terminal block, and
dual 1/8" minijacks for daisy-chain-
ing.
Output impedance Front
Left and Right channels
Brushed aluminum with black an-
odize or a light titanium finish.
Voltage source: Approx. zero ohms
Current source: Approx. one ohm
Power Consumption
TGA-7200
45W
At idle
RCA Input impedance:
280W
1800W
Typical (1/8th power)
Absolute Max (Fuse
Limit)
Power output
24 kΩ
200 watts continuous, per chan-
nel, into eight ohms, at 1 kHz
with no more than 0.5% T.H.D.
Input sensitivity for rated
output
Dimensions and Weight
17.0 inches wide
Unbalanced: 1.9 Vrms
Power at clipping, min:
5.9 inches high (including feet)
16.7 inches deep (to tips of con-
nectors)
Balanced:
0.95 Vrms
400 watts per channel into four
ohms.
XLR Input impedance:
Weight 34 lbs
Hum and Noise
10 kΩ, each leg balanced to
ground
-115 dB, A-Weighted
Finish
Female XLR
Brushed aluminum with black an-
odize or a light titanium finish.
Maximum output current
Pin 1 is ground
Pin 2 is positive (hot)
Pin 3 is negative (cold)
80 amperes peak to peak per
channel
Maximum output voltage
Damping Factor:
40 Vrms
150
© 2006 Sunfire Corporation.
All rights reserved. Sunfire Corpora-
tion reserves the right to improve
its products at any time. Therefore,
specifications are subject to change
without notice.
Output impedance Front
Left and Right channels
Voltage source: Approx. zero ohms
Current source: Approx. one ohm
RCA Input impedance
Manual part # : 913-135-00 Rev A
24 kΩ
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APPENDIX
Limited Warranty
Service Assistance
Sunfire Corporation is proud of its
products which have been built with
care using advanced technology and
premium component parts. Your unit
has been crafted to perform properly
for many years. Sunfire Corporation
offers the following Warranty to you,
the owner of a new Sunfire product:
Sunfire Corporation’s liability is
limited to the repair or replacement,
at our option, of any defective prod-
uct and shall not in any event include
property or any other incidental or
consequential damages which may
result from the failure of this product.
We suggest that you read the
Limited Warranty completely to fully
understand your Warranty/Service
coverage.
If your Sunfire Corporation product
ever requires service, write to us or
call:
Some states do not allow limitations
on how long an implied warranty lasts
and/or do not allow the exclusion or
limitation of incidental or consequential
damages, so the above limitations or
exclusions may not apply to you.
Sunfire Corporation
Technical Services Department
P.O. Box 1589
Snohomish, WA 98291
Tel (425) 335-4748
Fax (425) 335-4746
The Sunfire Corporation Warranty
for the Theater Grand Amplifier is in
effect for FIVE years from the date of
original retail purchase. The Sunfire
Corporation Warranty covers defects
in materials and workmanship. The
following, however, are excluded:
This Warranty gives you specific
legal rights, and you may also have
other rights which vary from state to
state. We suggest that you attach your
purchase receipt to this Warranty and
keep these in a safe place. Thank you
for your choice of a Sunfire Corpo-
ration product.
You will be directed to an autho-
rized Sunfire Corporation Service
Station or receive instructions to ship
the unit to the factory. Please save the
original shipping carton and packing
materials in case shipping is required.
Please do not ship Parcel Post.
a) Damage caused during ship-
ment.
b) Damage caused by accident,
misuse, abuse of operation
contrary to the instructions
specified in the Sunfire Corpo-
ration user’s manual.
NOTE: Before sending in your unit for
repair, you must call Sunfire for return
authorization.
c) Units where the serial number
has been defaced, modified or
removed.
Include a complete description of
the problem, indicating how you have
it connected, the associated equip-
ment in your system and a copy of
your purchase receipt. Initial shipping
costs are not paid by Sunfire Corpora-
tion; return ground shipping costs will
be prepaid if repairs were covered by
the scope of this Warranty.
d) Damage resulting from modi-
fication or attempted repair by
any person not authorized in
writing by Sunfire Corporation.
e) Units purchased from unau-
thorized dealers.
The Sunfire Corporation War-
ranty extends to the original owner
or subsequent owner(s) during the
five year warranty period, so long as
the original dated purchase receipt is
presented whenever warranty service
is required.
All implied warranties, including
warranties or merchantability and
fitness for particular purposes, are lim-
ited in duration to the five year length
of this Warranty, unless otherwise
provided by state law.
19
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MINIMUM SPE
AKE
R
LO
AD IMPED
ANCE
4
OHMS
Theater Grand
Amplifier
TGA-7400 / TGA-7400(E)
and TGA-7200 / TGA-7200(E)
seven
Manual part number : 913-135-00 Rev A
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