Sunfire True Subwoofer Super Junior User Manual

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  
User's Manual  
3
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:  
User's Manual  
4
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  
User's Manual  
5
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.  
User's Manual  
6
To use the high-pass outputs, connect  
the preamp outs on your preamp/  
receiver to the subwoofers line level  
inputs using good quality RCA type  
patch cords. Then connect a second  
patch cord from the subwoofers  
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 subwoofers 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  
subwoofers left input jack (see page  
11). There is no need to use the  
subwoofers 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 Yadapter  
at the preamplifier outputs (see page  
12). In this way, you can send the  
preamplifiers 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.  
User's Manual  
7
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 subwoofers 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 speakers magnet wont 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.  
User's Manual  
8
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 subwoofers 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 subwoofers 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.  
User's Manual  
9
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  
subwoofers 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.  
User's Manual  
10  
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 preamplifiers subwoofer output  
If your preamplifier has a  
subwoofer output (often  
labeled LFE for Low  
Frequency Effects), it can  
be connected to the  
subwoofers 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 Subwoofers  
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 subwoofers Bass  
Level control to 0dB, and then use the  
preamplifiers subwoofer level control for  
normal and routine adjustments.  
User's Manual  
11  
Connections to a preamplifier using Y cables  
If your preamplifier does  
not have a sub/LFE output,  
you can use Ycables 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.  
User's Manual  
12  
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  
subwoofers Line Level  
inputs and then connect  
the subwoofers 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  
subwoofers fixed high-  
pass crossover point.  
PREAMPLIFIER  
L
R
The signals coming out  
of the subwoofers 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  
subwoofers passive  
L
R
INPUTS  
AMPLIFIER  
crossover network, rather  
than the active network  
and controls.  
T
O
FR  
ONT SPEAKERS  
User's Manual  
13  
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  
subwoofers Speaker-Level  
inputs. The front speakers  
can still be connected to  
your receiver.  
The subwoofers 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 receivers  
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 subwoofers Speaker Level  
inputs.  
User's Manual  
14  
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 Carvers 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 Sunfires  
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.  
User's Manual  
15  
Specifications  
Amplifier Output  
Input sensitivity for full output:  
1,500 Watts rms (4.6 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:  
30Kfor Line-Level inputs  
5.6Kfor 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 bestits 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  
User's Manual  
16  
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 preamplifiers subwoofer/LFE  
output has an adjustable crossover  
frequency, make sure that the  
subwoofers 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 subwoofers 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 subwoofers Left  
(Mono) input. If the bass is still not  
enough after checking all the remaining  
points, use a Y cable to connect the  
preamplifiers single subwoofer/LFE  
output to the subwoofers 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 wont 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  
User's Manual  
17  
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 wasnt  
there before. Your first thought may be  
that the subwoofer has a problem, but  
this is more than likely caused by a  
ground-loopin 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 subwoofers 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 wont 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 wont turn on  
The subwoofers 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-loopintroduced 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  
User's Manual  
18  
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  
users 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 Corporations 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  
User's Manual  
19  
Manual part number 913-017-00 Rev B  

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