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15. To prevent electric shock, do not use
this polarized plug with an extension 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 courant, sauf si les lames
peuvent être insérées à fond sans laisser
aucune pariie à découvert.
This apparatus does not exceed the Class
A/Class B (whichever is applicable) limits
for radio noise emissions from digital
apparatus as set out in the radio
interference regulations of the Canadian
Department of Communications.
ATTENTION — Le présent appareil
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.
16. Grounding or Polarization —
Precautions should be taken so that the
grounding or polarization means of the
Component is not defeated.
WARNING:THIS SUBWOOFER IS CAPABLE OF PRODUCING
SOUND PRESSURE LEVELS IN EXCESS OF 108 dB. YOU
MUST TAKE EVERY PRECAUTION TO PROTECT YOUR
HEARING FROM PERMANENT DAMAGE.
Contents
Safety Instructions ....................................... 2
Introduction .................................................. 4
Features....................................................... 4
Unpacking.................................................... 4
Care
....................................................... 4
Overview ...................................................... 5
Control panel features ................................. 6
Installation.................................................... 8
Connections ................................................. 9
Location ..................................................... 10
System configurations ............................... 11
Adjusting the controls ................................ 15
Specifications............................................. 16
Troubleshooting guide ............................... 17
Limited warranty ........................................ 19
Service assistance ..................................... 19
To find out more about this and other Sunfire products,
please visit our website: www.sunfire.com
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Introduction
Dear Friend:
Features
•
•
•
•
•
High power, high efficiency amplifier
Very low distortion
Thank you for purchasing my Sunfire
True Subwoofer Super Junior. I hope you
enjoy it and the music it makes as much
as I have enjoyed creating it for you.
Long throw, premium quality drivers
Extremely compact size
Automatic signal-sensing turn-on and
standby mode
The big breakthrough features of the
subwoofer are its uncanny tracking
downconverter and its long throw, high
back-electromotive force driver. Taken
together, they provide this subwoofer
with as much bass as you could get from
several 15 inch drivers mounted in a
cabinet the size of a small refrigerator.
•
•
•
•
•
Line level unbalanced inputs
Speaker level binding post inputs
Line level high-pass outputs
Continuously variable phase control
Continuously variable crossover
frequency adjustment
•
•
Continuously variable volume level
control
Soft clipping circuit allows graceful
overload and prevents speaker
damage due to clipping
Unpacking
•
Gold-plated inputs and outputs.
Your Sunfire Subwoofer should reach
you in perfect condition. If you do notice
any shipping damage, please contact
your Sunfire Dealer immediately.
Care
To maintain the speaker cabinet’s
Gently lift out the unit and remove all
the packing material. It is important to
save all the packing materials and the
box in case your subwoofer ever needs
to be moved or shipped for repair.
finish, first unplug the power cord and
then use a soft, slightly dampened cloth
to clean the surfaces and finish off with a
dry cloth.
To keep the large rubber surrounds
soft and supple for 20 years or more,
treat them with MINK OIL, available at
most shoe repair stores. Rub a generous
amount into the surrounds with a soft
cloth about once a year (more often if
you live in a dry climate).
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 insurance
purposes.
Please take a moment to fill out and
mail the Sunfire Warranty Registration
card. Also read the serial number located
on the control panel and record it here:
If your Sunfire Subwoofer needs
servicing, please read the Troubleshoot-
ing section on page 17. If a problem still
persists, contact your nearest authorized
Sunfire Dealer.
Serial Number:
Purchased from:
Date:
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The Amplifier
Overview
Your Sunfire Subwoofer is designed to
give you the best possible low-frequency
sound quality for your home theater
experience. It incorporates a tremen-
dously powerful built-in amplifier and a
pair of drivers to produce tight, floor-
rumbling bass down to 22 Hz, that you
can feel as well as hear.
The large movement range of the
drivers creates greater air pressure
inside the box than a conventional
woofer. Therefore, the drive amplifier
must be much more powerful than an
ordinary woofer amplifier. In fact, it has
to be so powerful that it is almost hard to
believe.
The subwoofer has an adjustable high
cut filter and a choice of speaker-level or
line-level inputs for easy incorporation
into existing systems, or as part of a
subwoofer/satellite speaker combination.
The power amplifier within your Sunfire
Subwoofer is capable of delivering over
1,500 watts into a 4.6 ohm resistor (the
voice coil resistance of the subwoofer’s
driver). When the same full output is
applied to the driver, however, the
enormous back-electromotive force
generated as a consequence of its large
motion and giant magnet causes the
current flow to be much less than if it
were a 4.6 ohm resistor. It is this singular
property of the driver that allows the
woofer to be approximately ten times
more efficient than a woofer this size
would normally be. Hence, the actual
average input power is substantially less
than 1,500 watts, and is approximately
120 watts for most musical material on
the loudest passages.
The Woofer
To have lots of bass requires moving
lots of air. Your Sunfire Subwoofer
incorporates two drivers that can move
back and forth approximately five times
more than a normal subwoofer. This
gives it a lot of air moving capacity
which allows for majestic bass perfor-
mance.
Two drivers share the acoustic output.
Sometimes one driver appears to be
moving more than the other. They both
move the same amount only when
operating at the limit of their excursion
and power output, or when bass
requirements and music requirements
demand maximum output from the
system. Otherwise, the power is shared
between the two drivers in a way that
depends on the momentary amplitude
and the momentary musical spectrum. It
is normal for one or the other to move
more or less than its mate during
operation.
A compressor circuit kicks in automati-
cally if the input signal level reaches a
level that would overload the driver. This
maintains a ceiling on the output without
clipping.
If the input signal is driven even
further, a ‘soft clipping’ circuit is enabled.
This allows the woofer to put more sound
into the room to satiate the power hungry
user, but without distortion or damage to
the woofer. Thus, for explosive scenes in
movies, this produces extremely high
sound pressure levels (SPL) in your
room without the woofer banging against
its mechanical stops.
On the driver to the left of the control
panel there is a slight bump, under
which is a pressure cap. The bump is
normal. The driver on the right is
absolutely flat and very rugged. The one
with the slight bump is not quite as
rugged, and modest care should be
taken with it, though it is still very strong.
During installation, you should position
the driver with the bump towards a
protected side.
If you would like more detailed
information regarding the subwoofer
design, please call us and we will send
you a copy of our subwoofer technical
white paper, or you can view it on our
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Control Panel Features
1
2
3
4
5
6
7 8
9
1. Bass Level
3. Phase Control
This control lets you match the output
level of the subwoofer to the level of
your satellite/main speakers. The
subwoofer output will increase as this
control is rotated clockwise. When you
have just installed your system, turn
this down first before turning on your
subwoofer. This will prevent any loud
surprises.
This control changes the relative phase
of the subwoofer with respect to your
other speakers. Use this control to help
blend the subwoofer with the rest of
your system. This is accomplished by
adjusting the control in small incre-
ments as you listen for the most bass
at your listening position. As a final
trim, readjust the Crossover Frequency
and Bass Level controls after the
phase has been set.
2. Crossover Frequency
This controls the high frequency cutoff
point. With the control set to the 100Hz
mark, the subwoofer will reproduce
frequencies up to 100 Hz. If the control
is set fully clockwise, the crossover is
bypassed and the subwoofer will
reproduce a wide frequency range.
With the control fully counter-clockwise
the subwoofer reproduces a narrow
range, up to 35 Hz.
4. Outputs
Line level high-pass output signals are
available at these jacks. These outputs
are active whenever a signal is hooked
up to the inputs of the subwoofer. This
crossover is a passive network with a
fixed crossover frequency of 70 Hz and
a 6 dB per octave slope.
We recommend using this high-pass
function with main/satellite speakers
that are small and not designed to
reproduce low frequencies. If your
main speakers are capable of
Rotate the control until the bass
sounds natural. If the mid-bass sounds
natural but you want more low bass,
turn the control down a little, then turn
the Bass Level control up by about the
same amount. This increases the low-
bass output while leaving the mid-bass
output the same.
operating full range, then you will not
need to use the high-pass function.
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To use the high-pass outputs, connect
the preamp outs on your preamp/
receiver to the subwoofer’s line level
inputs using good quality RCA type
patch cords. Then connect a second
patch cord from the subwoofer’s
outputs to the inputs of your main
amplifier. This will allow your main
speakers to operate at frequencies
above 70 Hz and the subwoofer to
operate at frequencies below 70 Hz
(see page 13).
Your amplifier or receiver MUST
have common grounded outputs,
or it will be damaged if connected
to the subwoofer’s Speaker Level
inputs.
7. Line Fuse
The subwoofer is supplied with a
conservative 4 amp slow-blow type
fuse to protect the electronics.
Always unplug the power cord
before inspecting or changing the
fuse. Never use a fuse with a
larger current rating than 4 amps.
5. Line Level Inputs
Connect with RCA type patch cords to
the line level outputs of your receiver
or preamp.
8. IEC Linecord socket
The Sunfire Subwoofer comes with a
detachable linecord which connects
here.
If your preamplifier or receiver has a
single sub/LFE output, connect it to the
subwoofer’s left input jack (see page
11). There is no need to use the
subwoofer’s right input jack.
Connect the linecord to the
subwoofer before connecting the
other end to an 120 Volt, 60 Hz
AC outlet. The outlet must have a
circuit rating of 8 amps or more (a
typical home circuit is rated at 15
amps).
If you want to run your main/satellite
speakers full range, use a “Y” adapter
at the preamplifier outputs (see page
12). In this way, you can send the
preamplifier’s output signal to your
main amplifier and to the subwoofer at
the same time.
If you live in or move to a country
where the power grid is 220-240 Volts,
the subwoofer must be plugged into a
step-down transformer that is rated at
500 watts or more.
6. Speaker Level Inputs
Under normal conditions, the preferred
connection is through the Line Level
inputs. If this is difficult or not possible
in your system, then you can use the
Speaker Level inputs. Also, if you
experience excessive noise or hum
with the Line Level inputs, often a
simple change to the Speaker Level
inputs will result in a lower background
noise level.
Never plug the subwoofer directly
into 220-240 Volts AC as this will
cause catastrophic circuit failure.
9. Power/Auto on Indicator
This light is bright when the subwoofer
is on, and dim when the subwoofer is
in its standby mode. This is controlled
by the AUTO ON/OFF circuit. The
presence of an audio signal turns the
unit on. After approximately fifteen
minutes of signal absence, the
Connect the Speaker Level inputs to
the speaker-level outputs of your
amplifier or receiver using speaker
wire. The binding posts can accept
bare wire, banana, dual-banana or
spade connections.
subwoofer will go to its standby mode.
The light will only go completely off
when the unit is unplugged from the
wall.
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Heat rise
Installation
Observe the following general
precautions and read the safety
instructions on pages 2 and 3 before
using your Sunfire Subwoofer.
•
Allow adequate ventilation around
the metal control panel of the
subwoofer.
•
Do not let anything come into
contact with the panel and keep at
least two inches away from any
walls.
•
•
•
Never open the cabinet or remove
the metal control panel as this
might result in an electrical shock
to you or damage to the unit.
The metal control plate serves as the
amplifier heat sink and also as a conduit
to remove internal heat to the outside
and into the atmosphere. It can reach
temperatures of 60 degrees C, which will
feel hot to the touch, using nerves of
flesh and blood as temperature sensors.
As uncomfortable as it may feel, 60
degrees C cannot burn you, and in fact is
almost cool to copper, silicon, steel, and
aluminum, the materials from which your
woofer is constructed.
Protect it from prolonged exposure
to direct sunlight and other direct
sources of heat, such as heating
vents and radiators.
To prevent fire or shock, do not
expose the unit to rain or moisture.
If fluid or a foreign object should
enter the unit, immediately turn off
the power and contact your Sunfire
Dealer.
•
•
•
•
Avoid excessive exposure to
extreme cold or dust.
AC Power Considerations
Ensure that the unit is plugged into an
outlet capable of supplying the correct
voltage specified for your model.
Do not place heavy objects on top
of the unit.
Do not place the subwoofer with its
control panel against the floor.
Unplug your subwoofer’s power cord
from the electrical outlet if it will be left
unused for a long period of time.
If you wish to place your woofer so
the drivers face the floor and
NOTE: Never remove the ground
pin from any power cords. This is
very dangerous.
ceiling, thereby moving up and
down, use at least 1-1/2 inch high
spikes or feet for support. They
may be attached either with screws
or self-stick backing. This arrange-
ment will impart substantial house
and floor shaking motion.
Route the power-supply cord so it is
not likely to be walked on or pinched by
items placed upon or against it,
especially at plugs, convenience
receptacles, and the point where it exits
from the unit.
•
Four extra heavy, shock absorbing
rubber mounting feet have been
included. If your woofer tends to
wander about slightly while in use,
place these feet just inside the
existing feet positions. These shock
absorbing mounts will let the
Magnetic Fields
We recommend that you place your
woofer further than two feet away from
your TV, VCR, tape deck or computer,
so the speaker’s magnet won’t distort the
colors of your TV picture or erase your
video tapes, audio tapes or computer
discs.
woofer rock freely, thereby
absorbing low frequency rocking
energy, allowing it to adhere solidly
to the floor. To move the woofer
along the floor, rotate it onto one
edge and it will slide along easier.
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Connections
Please consider the following when
setting up your new system :
•
•
Whenever possible, keep the
powercords away from the signal
cables or speaker wires to prevent
any hum or interference being
heard in the speakers.
•
Before making or changing any
connections, ALWAYS make sure
that the subwoofer is unplugged
from the wall and your other
components are turned OFF. Also
turn down the volume control of the
subwoofer and your preamplifier or
receiver.
Choose reliable, high quality
interconnect cables, also called
patch cords or RCA cables. They
should be fully shielded and as short
as possible for the job. The longest
cable in your system will likely be
to the subwoofer, so choose a
good quality brand.
Tape Deck
DVD
•
Some patch cords can be a very
tight fit and there is usually a
preferred method of getting them
off. Some have to be removed with
a twisting action. Be gentle or you
may damage the jacks of the
subwoofer or your other compo-
nents.
Preamplifier
Power strip
Amplifier
Speaker Level connections
•
The subwoofer’s Speaker Level
inputs can accept speaker wires
with banana, dual-banana, bare
wire or spade terminals. If you
have banana type connectors on
your speaker wire, make sure that
you tighten the binding posts
before inserting.
AC outlets on the same circuit breaker
Subwoofer
•
Make sure that the negative
speaker wires never touch the
positive wires as this will short out
and possibly damage your amplifier
or receiver.
•
•
This diagram shows all the low
power components sharing a power
strip which is connected to the
same outlet used by the amplifier.
The subwoofer’s two negative
posts are joined internally
The subwoofer is connected to an
outlet on the same circuit breaker,
provided that the total system
current draw does not exceed the
breaker current rating.
(common-grounded). Your
amplifier must also be internally
common-grounded or you cannot
use this connection. Contact the
manufacturer of your amplifier to
make sure its outputs are common
grounded.
•
This arrangement will reduce the
possibility of an audible hum in your
system caused by a ground loop.
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Location
Your Sunfire Subwoofer is designed to
Using Two Subwoofers
be placed in a corner and this will
produce optimum performance.
Experiment with at least two corners and
then decide which is the best.
If you wish to use two woofers, the
sound output will double (an increase of
6 dB). Locate the woofers with one in
each corner and experiment with the
location and phase control to achieve the
best bass response.
#1 is very good positioning.
#2 is also excellent but may shake the
back wall too much and cause
things on or along the wall to rattle
too much. If this occurs, use the #3
position:
Always drive each woofer through the
Left/Mon input even though you are
driving one woofer with a right channel
drive and the other with a left channel
drive. If your preamplifier has a single
sub/LFE output, use a Y cable to split it
into two outputs.
#3 Move the woofer approximately
three feet away from the right wall
and place it along the back wall as
shown. This will substantially
reduce the rattling of the back wall
and will still pressurize the room
with lots of bass.
Although low frequencies are non-
directional, factors such as room
reflections, standing waves, resonance
and absorption strongly affect your
subwoofer’s performance.
Moving the subwoofer from one corner
to another can have a major effect on the
bass response.
Remember to keep it at least
two or three feet away from any
TV screen, computer, VCR or
magnetic tapes and discs. This
will reduce the chance of the magnetic
fields upsetting the TV screen or erasing
your magnetic media.
Also position the control panel so that
it is not touching anything and can
receive good ventilation.
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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 Sunfire Subwoofer are
connected to your preamplifier or
receiver.
Connections to a preamplifier’s subwoofer output
If your preamplifier has a
subwoofer output (often
labeled LFE for Low
Frequency Effects), it can
be connected to the
subwoofer’s Left (Mono)
input as shown. This is the
simplest and recom-
mended connection. A
receiver with a sub/LFE
output can be connected in
the same way.
The subwoofer will play
the low frequency range
and the other speakers will
play the frequency range
delivered to them by your
PREAMPLIFIER
amplifier.
L
R
MAIN
OUTPUTS
SUB/LFE OUT
If you have a home
theater preamplifier, it may
have an independent
subwoofer volume control.
Make sure this is correctly
adjusted, and that the
Sunfire Subwoofer’s
crossover frequency is set
to 100 Hz. This is by no
means an iron-clad rule,
rather it is a good starting
point. (See the crossover
frequency control details
on page 6 and adjustments
on page 15).
L
R
INPUTS
AMPLIFIER
T
O
FR
ONT SPEAKERS
You can set the subwoofer’s Bass
Level control to 0dB, and then use the
preamplifier’s subwoofer level control for
normal and routine adjustments.
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Connections to a preamplifier using Y cables
If your preamplifier does
not have a sub/LFE output,
you can use “Y” cables to
send its main outputs to
both the subwoofer and
your amplifier.
The subwoofer will play
the low frequency range
and your front speakers will
play the full range.
Although bass is
commonly distributed
evenly between left and
right channels (L+R bass),
movie soundtracks often
contain differential (L-R)
PREAMPLIFIER
bass. The opening scene in
L
R
“Top Gun”, for example,
has loads of L-R bass
information. If this is not
preserved, the bass in
these scenes sounds
anemic. The Sunfire
MAIN
SUB/LFE OUT
OUTPUTS
Subwoofer utilizes
differential gain on the left
and right inputs to retain
both the L+R and L-R
information. Therefore,
systems which do not have
a dedicated sub/LFE output
should use both the left
and the right inputs as
shown, for the greatest
bass impact.
L
INPUTS
R
AMPLIFIER
T
O
FR
ONT SPEAKERS
An alternative connection method
without using Y cables is shown on the
next page.
If your preamp/receiver has a
dedicated sub/LFE output, then only the
Left (Mono) input is used, as shown on
the previous page.
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Using the line level high-pass outputs
If you are using a
preamplifier which does not
have a sub/LFE output,
you can send its left and
right front output into the
subwoofer’s Line Level
inputs and then connect
the subwoofer’s High-Pass
outputs to the inputs of
your amplifier.
The subwoofer will play
the low frequencies and
your amplifier and front
speakers will play the
frequency range above the
subwoofer’s fixed high-
pass crossover point.
PREAMPLIFIER
L
R
The signals coming out
of the subwoofer’s high-
pass outputs are not
MAIN
OUTPUTS
affected by any of the
controls. They are just a
copy of the signals going in
except that the low bass is
filtered out. This uses the
subwoofer’s passive
L
R
INPUTS
AMPLIFIER
crossover network, rather
than the active network
and controls.
T
O
FR
ONT SPEAKERS
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Using the speaker level inputs
If you are using a
receiver which does not
have a subwoofer output or
line level outputs (pre-
outs), you can connect its
speaker outputs to the
subwoofer’s Speaker-Level
inputs. The front speakers
can still be connected to
your receiver.
The subwoofer’s internal
amplifier supplies the
power to reproduce the low
frequency range. It
receives a sample of the
signal going to your front
speakers. (An insignificant
RECEIVER
fraction of your receiver’s
power is transferred to the
subwoofer).
MAIN
OUTPUTS
L
R
There is no need to use
the Speaker Level inputs if
you are using a separate
amplifier and preamplifier.
Such systems are best
connected using the Line
Level inputs as shown in
the previous diagrams.
T
O
FR
ONT SPEAKERS
If you are using the Line Level inputs
and there is a excessive amount of noise
or hum present, using the Speaker Level
inputs may yield a lower background
noise level.
Your receiver MUST have
common grounded outputs, or it
will be damaged if connected to
the subwoofer’s Speaker Level
inputs.
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Adjusting the controls
There are two main methods for
adjusting the level, crossover frequency
and phase of the Sunfire Subwoofer to
match a system:
Step 3. With both the subwoofer and
the main speaker connected, measure
the level of the tones at the available
frequencies. Because the crossover is
set too high, you will have a peaked
response. Adjust the crossover control to
get the smoothest response.
•
•
Bob Carver’s preferred method:
By listening and making the
adjustments to suit your taste.
Step 4. Use the phase control to make
the response even smoother. It has its
biggest effect at the crossover fre-
quency. You can iterate between the
crossover and the phase controls. Keep
your hands off the level control! It was
set correctly in step 2.
Laboratory method:
By measuring the output and
adjusting for a flat frequency
response.
Excellent results can be obtained if
you make the adjustments based on
simply listening. This is Sunfire’s
preferred method as it allows the system
to be voiced based on what sounds the
best, whereas laboratory-flat frequency
response can often be clinical and less
than exciting.
Step 5. Listen to the subwoofer.
Resist all temptations to turn up the level
control. Play something with really deep
bass to confirm that your subwoofer is
working.”
Control settings
The following procedure is for those
who prefer a more methodical and
scientific approach. This excerpt is from
“The Audio Critic,” issue 24, page 31,
written by contributing editor David Rich,
and is reprinted here with their kind
permission.
Use this drawing to record some of
your favorite settings.
You will need a test CD with low-
frequency warble tones, and a sound
pressure-level meter. The Radio Shack®
SPL meter will do fine, as will the
Stereophile® test CD.
“Step 1. Disconnect the subwoofer
and run the main speaker with a tone in
its passband (80-100Hz). Measure the
level.
Step 2. Disconnect the main speaker
and reconnect the subwoofer. Set the
subwoofer to its highest crossover
frequency. Set the level control of the
subwoofer to give the same sound
pressure level with the same tone you
used in Step 1.
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Specifications
Amplifier Output
Input sensitivity for full output:
1,500 Watts rms (4.6 Ω impedance)
240mVrms from left input with volume
control at 0dB, 90mVrms with volume
High Cut Filter
control fully clockwise
*
35 Hz - 100 Hz adjustable. The
crossover can be bypassed by rotating
the crossover frequency control fully
clockwise.
0.48Vrms from right input with volume
control at 0dB, 180mVrms with volume
control fully clockwise
*
Input impedance:
30KΩ for Line-Level inputs
5.6KΩ for Hi-Level inputs
Frequency Response
22 Hz - 100 Hz
Power Line Voltage
Driver:
AC 120 V/60 Hz
Extra large magnet and long throw
mechanical design yield very high back-
emf. The result is extraordinarily high
operating efficiency – that is, more
acoustic output for each watt of input.
Dimensions
9" x 9" x 9"
Weight
29 lbs
Internal system gain:
42dB from left input jack to speaker with
the Bass Level control at 0dB, 54dB with
Finish
Black anodize and black lacquer.
the control fully clockwise
*
36dB from right input jack to speaker
with the Bass Level control at 0dB, 48dB
with the control fully clockwise
Line power consumption:
300 W average, 22 Hz to 100 Hz, at
absolute maximum continuous output.
*
The Sunfire Subwoofer utilizes
1200 W peak, time limited basis
*
differential gain on the left and right
inputs to retain both L+R and L-R
information.
Output levels:
Greater than 108 dB peak SPL
(includes room gain) from 25 Hz to 90
Hz
A typical Sunfire subwoofer can be
expected to ‘best’ its specified minimum
peak SPL by several decibels.
© 2001 Sunfire Corporation.
All rights reserved. Sunfire Corporation
reserves the right to improve its products
at any time. Therefore, specifications are
subject to change without notice.
Manual part number 913-017-00 Rev B
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Troubleshooting
The Sunfire Subwoofer is expertly
designed and built to provide years of
trouble-free performance. Most
problems that occur can usually be
solved by checking your setup or
making sure that the components
connected to the amplifier are on and
fully operational.
remote control or with a small volume
knob on the back panel. Make sure that
this is adjusted correctly.
•
If the preamplifier’s subwoofer/LFE
output has an adjustable crossover
frequency, make sure that the
subwoofer’s own crossover point is set
higher or part of the bass range will be
missing.
The following information will help you
deal with common problems you may
experience during normal use. If a
problem still persists, please contact
your Sunfire Dealer for assistance.
Not enough bass in a 5.1
system
•
5.1 home theater preamplifiers usually
have a bass management system which
allows the bass to be redirected among
your speakers. For example, the bass
normally present in the front speakers
can be redirected to play in the
subwoofer, or the subwoofer can play
the bass from all the speakers, in
addition to its dedicated LFE (low
frequency effects) channel. Make sure
that all of the bass management options
are correctly set. The preamplifier may
have a way of turning the subwoofer
output off entirely, so check that it is
always on.
Not enough bass
•
Check that the input connections are
going to the input terminals and not the
output terminals. In other words, the
connections from your preamplifier
must go to the subwoofer’s line level
inputs instead of the line level high
pass outputs. If they are connected to
the outputs by mistake, the bass will be
weak but the subwoofer will still
function.
•
If your preamplifier has a single
subwoofer/LFE output jack, make sure
it connects to the subwoofer’s Left
(Mono) input. If the bass is still not
enough after checking all the remaining
points, use a Y cable to connect the
preamplifier’s single subwoofer/LFE
output to the subwoofer’s right and left
inputs.
•
Check that the preamplifier calibration
procedure is correctly adjusted. Usually,
the preamp will send a test tone through
all the speakers in your system,
allowing you to adjust (trim) the volume
of each channel until they are all playing
at the same level.
•
Make certain the woofer is in a corner
location, firing at 45 degrees into the
walls formed by the corner. This is not
absolutely essential, but will maximize
the bass output and give the smoothest
possible response. If you place the unit
so one of the drivers is firing into one of
the walls, leave three inches of
•
•
If the bass is weak only when playing
5.1 surround sources, check that your
preamplifier is correctly set to decode
the 5.1 surround modes, such as Dolby
Digital or DTS.
Some DVD discs have a menu which
allows you to select which soundtrack to
play. Check that the correct 5.1
surround audio soundtrack is selected,
otherwise it may just play stereo into
your preamp and you won’t get the true
LFE signal into the subwoofer.
clearance between the driver and the
wall.
•
Home theater preamplifiers usually
have a way of adjusting the level of the
subwoofer/LFE output, either using a
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hum is caused by the cable TV line,
then you will need a “ground-loop
isolator.” This is an inexpensive device
fitted in line with the coaxial cable feed.
Hum
Adding any component such as a
subwoofer to an existing system will
often give rise to a hum which wasn’t
there before. Your first thought may be
that the subwoofer has a problem, but
this is more than likely caused by a
“ground-loop” in your system.
•
•
If the hum persists, disconnect all the
source components one at a time from
the back of the preamplifier until you
identify the problem.
If you are using the subwoofer’s Line
Level inputs and there is a excessive
amount of noise or hum present, using
the Speaker Level inputs may yield a
lower background noise level.
Follow these steps to isolate the main
cause of the ground-loop hum (there
may even be more than one cause).
•
•
Try to have all of your equipment on
the same electrical outlet or circuit, see
page 9 for more details.
•
Ground-loop isolators are available for
audio lines and video. Once you have
identified which components are
causing a problem, you can fit the
isolators between the component and
the preamplifier.
If your subwoofer is a fair distance
away from your other equipment, you
may use a 15 amp extension cord as
long as it has a ground connection.
NOTE: Never remove the ground
pin from any power cords. This is
very dangerous.
The subwoofer won’t turn off
•
The subwoofer should turn itself off
after approximately fifteen minutes with
no audio signal present. If not, check
there is no background hum. The
subwoofer may sense hum as a small
signal and stay on. See the above hints
to eliminate the hum.
•
•
Turn off all components in your
system, including the subwoofer,
amplifiers and the preamplifier, before
disconnecting or connecting cables.
First remove every connection from the
subwoofer to the rest of your system.
Plug the subwoofer power cord back in
and check for the hum. If it is still there,
try plugging it into a different outlet in
case it is picking up interference on the
AC line.
The subwoofer won’t turn on
•
The subwoofer’s volume control may be
turned down or no signal is received
from your preamplifier.
•
•
Check the input connections.
•
If you have followed the above
Check the mode switch on surround
systems to be certain that a bass signal
is being sent to the subwoofer.
guidelines for the power connections
and a hum is still present, then there is
one very common problem to consider:
a “ground-loop” introduced by connect-
ing a cable TV line to a VCR or TV,
which is then connected to the preamp.
This can be addressed as follows:
Audible snap from outlet
•
When the subwoofer is initially plugged
into the wall, there is an in-rush current
surge as the power supply capacitors
charge up. This may give rise to an
audible snap from the outlet as the plug
is inserted. This can be avoided by
plugging the subwoofer into a switched
outlet or switched power strip (rated at
15 Amps or more).
•
Disconnect all cables which come from
outside the room, such as cable TV,
satellite TV, or roof top antennas. Make
sure that they are disconnected where
they first enter the room, so they are
making no connection to your preampli-
fier, TV, or any other component. If the
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Limited Warranty
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:
damages which may result from the
failure of this product.
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.
The Sunfire Corporation Warranty for
the Subwoofer Super Junior is in effect
for TWO 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 Corporation product.
a) Damage caused during shipment.
Service Assistance
b) Damage caused by accident,
misuse, abuse of operation
contrary to the instructions
specified in the Sunfire Corporation
user’s manual
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:
Sunfire Corporation
c) Units where the serial number has
been defaced, modified or
removed,
Technical Services Department
P.O. Box 1589
d) Damage resulting from modifica-
tion or attempted repair by any
person not authorized in writing by
Sunfire Corporation.
Snohomish, WA 98290
Tel (425) 335-4748
Fax (425) 335-4746
You will be directed to an authorized
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.
The Sunfire Corporation Warranty
extends to the original owner or
subsequent owner(s) during the two 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 limited in
duration to the two year length of this
Warranty, unless otherwise provided by
state law.
NOTE: Before sending in your unit for
repair, you must call Sunfire for return
authorization.
Include a complete description of the
problem, indicating how you have it
connected, the associated equipment in
your system and a copy of your purchase
receipt. Initial shipping costs are not paid
by Sunfire Corporation; return ground
shipping costs will be prepaid if repairs
were covered by the scope of this
Warranty.
Sunfire Corporation’s liability is limited
to the repair or replacement, at our
option, of any defective product and shall
not in any event include property or any
other incidental or consequential
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Manual part number 913-017-00 Rev B
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