Sunfire Speaker HRS 10 User Manual

High Resolution Series  
Subwoofer  
HRS-8, HRS-10, and HRS-12  
User's Manual  
 
18. This equipment has been tested and  
found to comply with the limits for a Class  
B digital device, pursuant to Part15 of the  
FCC Rules. These limits are designed  
to provide reasonable protection against  
harmful interference in a residential instal-  
lation. This equipment generates, uses  
and can radiate radio frequency energy  
and, if not installed and used in accor-  
dance with the instructions, may cause  
harmful interference to radio communica-  
tions. However, there is no guarantee that  
interference will not occur in a particular  
installation.  
equipment off and on, the user is encour-  
aged to try to correct the interference by  
one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the  
equipment and receiver.  
Connect the equipment into an outlet on  
a circuit different from that to which the  
receiver is connected.  
Consult the dealer or an experienced  
radio/TV technician for help.  
19. Caution: Changes or modifications not  
expressly approved by Sunfire could void  
the user's authority to operate this equip-  
ment.  
If this equipment does cause harmful inter-  
ference to radio or television reception,  
which can be determined by turning the  
WARNING:THIS SUBWOOFER IS CAPABLE OF PRODUCING  
VERY HIGH SOUND PRESSURE LEVELS. YOU MUST TAKE  
EVERY PRECAUTION TO PROTECT YOUR HEARING FROM  
PERMANENT DAMAGE.  
Contents  
Safety Instructions.........................................ꢀ  
Introduction ...................................................4  
Features........................................................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 nd out more about this and other Sunfire products,  
please visit our website: www.sunfire.com  
User's Manual  
 
Introduction  
Features  
Thank you for purchasing a Sunfire  
High Resolution Series Subwoofer. We  
hope you enjoy it and the music it makes  
as much as we have enjoyed creating it  
for you.  
Patented high-pressure, High Back-  
emf, extra-long-throw design  
High efficiency Tracking Downconverter  
amplifier  
Low distortion  
The big breakthrough features of the  
subwoofer are its uncanny 1,000W Track-  
ing Downconverter amplifier, and its long  
throw, High Back-emf woofer. These  
powerful forces combine to produce as  
much bass as several 15 inch drivers  
mounted in a cabinet the size of a small  
refrigerator! And, the High Resolution  
Series' extended frequency response  
means that your subwoofer is the perfect  
match to virtually any loudspeaker.  
Premium quality driver  
Extremely compact size  
Automatic signal-sensing turn-on and  
standby mode  
Line-level inputs  
Speaker-level binding post inputs  
Line-level high-pass outputs  
Phase control  
Crossover frequency control  
Volume control  
Unpacking  
Your Sunfire subwoofer should reach  
you in perfect condition. If you do notice  
any shipping damage, please contact  
your Sunfire Dealer immediately.  
Soft clipping circuit allows graceful  
overload and prevents speaker dam-  
age due to clipping  
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.  
Care  
To maintain the speaker cabinet’s fin-  
ish, first unplug the power cord and then  
use a soft cloth to clean the surfaces.  
If your Sunfire subwoofer needs ser-  
vicing, please read the troubleshooting  
section on page ꢀ1. If a problem persists,  
contact your nearest authorized 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 insurance  
purposes.  
Please take a moment to fill out and  
mail the Sunfire Customer Response  
card. Also read the serial number located  
on the control panel and record it here:  
Serial Number:  
Purchased from:  
Date:  
User's Manual  
4
 
Overview  
If the input signal is driven even further,  
a ‘soft clipping’ circuit is enabled. This  
allows the driver to put more sound into  
the room to satiate the power hungry  
user, but without distortion or damage to  
the driver. This produces extremely high  
sound pressure levels (SPL) in your room  
without the driver banging against its  
mechanical stops.  
The Sunfire HRS subwoofers are  
designed to give you the best possible  
low-frequency sound quality for your  
Home Theater and music playback expe-  
rience. They incorporate a tremendously  
powerful built-in amplifier to produce  
tight, seismic, denture-rumbling bass that  
you can feel as well as hear.  
There are three models in the high  
resolution series: the HRS-8, HRS-10,  
and the HRS-1ꢀ. (The number represents  
the driver diameter in inches.) The control  
panel, connections and operation are the  
same for each subwoofer model, and this  
manual covers all three models.  
Sub/LFE  
In this manual, the term “Sub/LFE” is  
used to denote the subwoofer or Low  
Frequency Effects output, commonly  
found on Home Theater processors and  
receivers.  
Each subwoofer has controls for adjust-  
ing the crossover frequency, phase, and  
volume. They also have line-level and  
speaker-level inputs for easy incorpor-  
ation into existing systems, or as part of a  
subwoofer/satellite speaker combination.  
The Driver  
To have lots of bass requires the move-  
ment of lots of air. To achieve this, the  
subwoofer's driver has been designed to  
travel back and forth approximately five  
times further than a normal driver. This  
gives lots of air movement and massive  
bass performance.  
The Tracking Downconverter  
Amplifier  
The large movement range of the driver  
generates greater air pressure inside the  
box than a conventional driver. In order  
to create this range of movement, we  
designed a drive amplifier that is much  
more powerful than an ordinary amplifier.  
A signal compressor circuit kicks in  
automatically if the input signal level  
reaches a level that would overload the  
driver. This maintains a ceiling on the  
output without clipping.  
User's Manual  
5
 
Control Panel Features  
5
6 7 8 9 10  
1
4
1. Power Indicator  
4. AC Line Fuse  
This light is bright when the subwoofer  
is on, and dim when the subwoofer is in  
standby mode.  
The subwoofer is supplied with a  
conservative slow-blow type fuse to  
protect the electronics. If this fuse fails,  
replace it with the exact same type and  
current rating for your local AC voltage,  
as marked on the control panel near  
the fuse holder.  
ꢀ. Power Switch  
Press the top of this rocker switch to  
turn on the subwoofer.  
Note: Always unplug the power  
cord from your AC outlet before  
removing the fuse. To replace or  
inspect the fuse, use a small flat-  
ended screwdriver to gently pry out the  
fuse carrier and fuse.  
The subwoofer has an automatic  
signal-detection circuit. After approxi-  
mately fifteen minutes with no signal,  
the subwoofer will go into its quiet  
standby mode. The presence of an  
audio signal will turn it back on.  
5. Speaker-Level Inputs  
Normally you can leave the switch on,  
and let the subwoofer turn on when a  
signal is present, or off when it's not.  
If you are using a receiver which only  
has speaker-level outputs, you can  
connect it using the speaker-level  
inputs (see the hookup diagram on  
page 14). They can accept bare wire,  
banana, or dual-banana connectors.  
At night, or if you go out, or on vaca-  
tion, you can press the bottom of the  
power switch to turn the subwoofer off.  
ꢁ. IEC Power Connector  
If you experience excessive noise or  
hum using the line-level inputs, try us-  
ing the speaker-level inputs. This may  
lower the background noise level.  
The subwoofer comes with a detach-  
able linecord that attaches here. Make  
sure it is firmly pushed into place.  
Connect the other end to an AC outlet  
that is properly configured for the type  
of plug and has the correct voltage for  
your model.  
User's Manual  
6
 
6. Line-Level Inputs  
8. Crossover Frequency  
These connect with RCA type cables  
from the line-level outputs of your  
receiver or preamp. Here are two  
examples:  
This controls the crossover frequency  
between ꢁ0 Hz and 100 Hz. If it is set  
to ꢁ0 Hz for example, the subwoofer  
will reproduce those frequencies below  
ꢁ0 Hz. Rotating the control clockwise  
will smoothly increase this frequency  
range up to 100 Hz.  
If your processor or receiver has a  
single subwoofer 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.  
In the bypass position, the crossover  
control has no effect. You should set  
this to bypass if your processor has its  
own subwoofer crossover frequency  
control.  
If your processor does not have a  
subwoofer output, use “Y” adapters at  
the processor outputs (see page 12). In  
this way, you can send the processor’s  
full-range output signals to your main  
amplifier and to the subwoofer at the  
same time.  
If your processor does not have its own  
subwoofer crossover frequency control,  
rotate this control until the bass sounds  
natural. If the mid-bass sounds natural  
but you want more low bass, turn the  
crossover frequency down a little, then  
turn the volume up by about the same  
amount. This increases the low-bass  
output while leaving the mid-bass  
output the same.  
7. High-Pass Outputs  
Signals from these output jacks are a  
direct copy of the signals going into the  
input jacks of the subwoofer, with the  
exception that the bass below 70 Hz  
has been removed by a fixed high-pass  
crossover circuit. This handy feature  
lets the subwoofer control all the bass  
in your system, and you can use an  
external amplifier and smaller satellite  
speakers to control the mids and highs.  
(See the hookup diagram on page 13.)  
9. Phase  
This controls the relative phase of the  
subwoofer with respect to your other  
speakers. Use this to help blend the  
subwoofer with the rest of your system.  
Adjust the control in small increments  
as you listen for the most bass at  
your listening position. As a final trim,  
readjust the crossover frequency and  
volume controls after the phase control  
has been set.  
We recommend using this high-pass  
function with small main/satellite speak-  
ers that are not designed to reproduce  
low frequencies. If you are used to the  
sound from smaller speakers, this op-  
tion will really bring your system alive.  
10.Volume  
If your main speakers are capable of  
operating full range, you will not need  
to use the high-pass function.  
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  
installing your system, turn this down  
first before turning on your subwoofer,  
to prevent any loud surprises.  
User's Manual  
7
 
Installation  
Observe the following general precau-  
tions and read the safety instructions  
on pages ꢀ and ꢁ before using your  
Subwoofer.  
AC Power Considerations  
Ensure that the subwoofer is plugged  
into an outlet capable of supplying the  
correct voltage specified for your model.  
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.  
Unplug your subwoofer’s power cord  
from the electrical outlet whenever you  
leave the subwoofer unused for a long  
period of time.  
Protect the subwoofer from  
prolonged exposure to direct  
sunlight and other direct sources  
of heat, such as heating vents and  
radiators.  
Note: Never remove the ground  
pin from any power cords. This is  
very dangerous.  
Route the power supply cord away  
from areas where it is likely to be walked  
on, or pinched by items placed upon  
it or against it, especially near the AC  
wall socket, any multi power strips, or  
near where the IEC cord attaches to the  
component.  
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 Dealer.  
Avoid excessive exposure to  
extreme cold or dust.  
Magnetic Fields  
We recommend that you place your  
subwoofer further than two feet away  
from your TV, VCR, tape deck or com-  
puter, so the speaker’s magnet won’t  
distort the colors of your TV picture or  
erase your video tapes, audio tapes or  
computer discs.  
Do not place heavy objects on top  
of the unit.  
Do not place the subwoofer with its  
control panel against the floor.  
Heat  
Allow adequate ventilation around  
the metal control panel of the  
subwoofer.  
Let nothing come into contact with  
the panel and keep it at least two  
inches away from any walls.  
The metal control plate serves as the  
amplifier heat sink, and also removes  
internal heat to the outside and into the  
atmosphere. It can reach temperatures  
of 60 degrees C, which feels hot to the  
touch.  
User's Manual  
8
 
Connections  
Please consider the following when set-  
ting up your new system :  
Choose reliable, high quality  
interconnect 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.  
Before making or changing any  
connections, ALWAYS make sure  
that the subwoofer and your other  
components are turned OFF. Turn  
down the volume control of both the  
subwoofer and your processor or  
receiver.  
Some cables can be a very tight  
fit and there is usually a preferred  
method of removing them. Some  
have to be removed with a twisting  
action. Be gentle, as twisting may  
cause damage to the jacks of the  
subwoofer or your other compo-  
nents.  
Tape Deck  
DVD  
Preamplifier  
Speaker-level connections  
The subwoofer’s speaker-level in-  
puts can accept speaker wires with  
banana, dual-banana, or bare wire.  
If you have banana-type connec-  
tors on your speaker wire, tighten  
the binding posts before inserting.  
Power strip  
Amplifier  
Make sure that the negative  
speaker wires never touch the posi-  
tive wires. This will short out and  
possibly damage your amplifier or  
receiver.  
AC outlets on the same circuit breaker  
Subwoofer  
The subwoofer’s two negative  
posts are joined internally (com-  
mon-grounded). Your amplifier or  
receiver must also be internally  
common-grounded or you cannot  
use this connection. Contact the  
manufacturer of your amplifier or  
receiver to make sure its outputs  
are common grounded.  
This diagram shows all the low  
power components sharing a power  
strip which is connected to the  
same outlet used by the main power  
amplifier.  
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.  
Whenever possible, keep the power  
cords away from the signal cables  
or speaker wires to prevent hum or  
interference.  
User's Manual  
9
 
Location  
Here is a neat trick to find the best  
subwoofer location for your room:  
Magnetic Fields  
Remember to keep the subwoofer  
1. Start by placing it right on the seat  
of your favorite couch or easy chair.  
(This method is odd, but it is based  
on principles of acoustic physics).  
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.  
ꢀ. If the subwoofer is part of a Home  
Theater system you can use the  
calibration test tone (pink noise)  
usually found in the processor/  
receiver's setup menu; or you can  
simply plug the outputs from a CD  
player directly into the subwoofer’s  
line-level inputs, remembering to  
turn down the volume level on the  
subwoofer first, and then play-  
ing some of your favorite music  
samples containing heavy bass.  
Using two Subwoofers  
If you wish to use two subwoofers, the  
sound output will double (an increase of  
6 dB). Locate the subwoofers with one  
in each corner and experiment with the  
location and phase control to achieve the  
best bass response.  
Always drive each subwoofer through  
the left line-level input even though you  
are driving one subwoofer 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.  
ꢁ. Walk around the room listening.  
Stand in all the locations where  
you might place the subwoofer. Try  
crouching down, particularly in the  
corners. Find the place where the  
subwoofer’s bass output sounds  
the loudest.  
4. Turn off the subwoofer and discon-  
nect it from the power and from  
your processor/receiver or CD  
player. Next, install the subwoofer  
in the location you have just deter-  
mined is best and remake all your  
connections.  
Although low frequencies are non-di-  
rectional, factors such as room reflec-  
tions, standing waves, resonance and ab-  
sorption will strongly affect your subwoof-  
er’s performance. Moving the subwoofer  
from one location to another can have a  
major effect on the bass response.  
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 preamplifier’s subwoofer output  
If your processor or receiver has  
a subwoofer output (Sub/LFE), it  
should be connected to the sub-  
woofer’s Left input as shown. This  
is the simplest and recommended  
connection.  
If you have a Home Theater pro-  
cessor or receiver, it probably has  
an independent subwoofer volume  
and crossover control. If so, you  
should set the subwoofer’s volume  
control to 0 dB, the crossover to  
Bypass, and use the processor’s  
subwoofer level and frequency con-  
trols for adjustments.  
PREAMPLIFIER  
L
R
MAIN  
OUTPUTS  
SUB/LFE OUT  
L
INPUT  
R
S
AMPLIFIE  
R
T
O
FRONT  
SPEAKERS  
User's Manual  
11  
 
Connections using Y cables  
If your processor does not have  
a Sub/LFE output, you can use  
“Y” cables (or Y adaptors) to send  
its left and right 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) bass. If this is  
not preserved, the bass  
in these scenes  
sounds anemic. The  
subwoofer utilizes  
differential gain on  
PREAMPLIFIER  
L
R
MAIN  
SUB/LFE OUT  
the left and right  
OUTPUTS  
inputs to retain both  
the L+R and L-R  
information.  
Systems that 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
R
S
INPUT  
AMPLIFIE  
R
T
O
FRONT  
SPEAKERS  
User's Manual  
1ꢀ  
 
Using the line-level high-pass outputs  
If you are using a receiver or  
processor 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  
(70 Hz) high-pass crossover  
point.  
The signals com-  
PREAMPLIFIER  
ing out of the sub-  
woofer’s high-pass  
outputs are not  
L
R
MAIN  
OUTPUTS  
affected by any of  
the controls. They  
are just a copy of  
the signals going  
into the subwoofer  
except that the  
low bass is filtered  
out. This uses  
L
R
INPUTS  
AMPLIFIER  
the subwoofer’s  
passive crossover  
network, set at 70  
Hz, rather than the  
active network and other controls.  
This is an excellent method if your  
speakers are small satellites or mini-  
monitors, and/or your power amplifier is  
T
O
of limited power, such as a tube amp.  
FRONT  
SPEAKERS  
For the ultimate in computer sound  
systems, connect the left and right audio  
output from your computer sound card  
into the subwoofer inputs. Connect the  
sub's high-pass outputs to the inputs of  
your powered speakers. You may need  
some RCA-to-mini plug adaptors to make  
the connections. Adjust the sub's volume  
control to match low-powered speakers.  
See the note about magnetic fields on  
page 10.  
User's Manual  
1ꢁ  
 
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 speak-  
ers. (An insignificant  
fraction of your  
receiver’s  
power is  
transferred  
to the  
RECEIVER  
subwoofer).  
MAIN  
OUTPUTS  
There is no  
L
R
need to use  
the speaker-  
level inputs  
if you are  
using a separate  
preamplifier/processor and a  
power amplifier. Such systems  
are best connected using the  
line-level inputs as shown in the  
previous diagrams. However, 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.  
T
O
FRONT  
SPEAKERS  
The subwoofer’s two negative  
posts are joined internally (com-  
mon-grounded). Your receiver/pow-  
er amplifer must also be internally  
common-grounded or you cannot  
use this connection. Contact the  
manufacturer of your receiver to make  
sure its outputs are common grounded.  
User's Manual  
14  
 
Adjusting the controls  
There are two main methods for adjust-  
ing the volume, crossover frequency and  
phase controls to match a system:  
Step 4. Use the phase control to make  
the response even smoother. It has its  
biggest effect at the crossover frequency.  
You can iterate between the crossover  
and the phase controls. Keep your hands  
off the volume control! It was set correctly  
in step ꢀ.  
Preferred method: By listening and  
making the adjustments to suit your  
taste.  
Laboratory method: By measur-  
ing the output with a microphone  
and adjusting for a flat frequency  
response.  
Step 5. Listen to the subwoofer. Resist  
all temptations to turn up the volume  
control. Play something with really deep  
bass to confirm that your subwoofer is  
working.”  
Excellent results can be obtained if you  
make the adjustments based on simply  
listening. This is our preferred method as  
it allows the system to be voiced based  
on what sounds the best, whereas labo-  
ratory-flat frequency response can often  
be clinical and less than exciting.  
Record your favorite settings here:  
The following procedure is for those  
who prefer a more methodical and scien-  
tific approach. This excerpt is from “The  
Audio Critic,” issue ꢀ4, page ꢁ1, written  
by contributing editor David Rich, and is  
reprinted here with their kind permission.  
Note:  
You will need a test CD with low-fre-  
quency warble tones, and a sound pres-  
sure-level meter. The Radio Shack® SPL  
meter will do fine, as will the Stereophile®  
test CD.  
Some Home Theater processors and  
receivers have an internal crossover  
adjustment which allows you to vary how  
much of the bass frequency range is sent  
to the subwoofer.  
“Step 1. Disconnect the subwoofer  
and run the main speaker with a tone in  
its passband (80-100 Hz). Measure the  
level.  
In these systems, it is recommended  
that you set your subwoofer's own  
crossover control to maximum frequency,  
or "Bypass." You can then make any  
crossover frequency adjustments using  
your Home Theater processor or receiver  
controls.  
Step ꢀ. Disconnect the main speaker  
and reconnect the subwoofer. Set the  
subwoofer to its highest crossover  
frequency. Set the volume control of the  
subwoofer to give the same sound pres-  
sure level with the same tone you used  
in Step 1.  
If the subwoofer’s internal crossover  
is set to a frequency lower than the one  
on your Home Theater processor or  
receiver, there would be a hole in the  
mid-bass, and bass information would be  
missing.  
Step ꢁ. 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.  
User's Manual  
15  
 
Specifications  
Amplifier Output  
Input sensitivity for full  
output:  
1,000 watts rms  
ꢀ40 mVrms from left input with volume  
control at 0 dB, 90 mVrms with volume  
control fully clockwise.  
High Cut Filter  
ꢁ0 Hz - 100 Hz adjustable. The  
crossover can be bypassed by rotating  
the crossover frequency control fully  
clockwise.  
0.48 Vrms from right input with volume  
control at 0 dB, 180 mVrms with volume  
control fully clockwise.  
Frequency Response  
Input impedance:  
HRS-8  
ꢀꢀ Hz - 100 Hz  
ꢁ0 KΩ for Line-Level inputs  
HRS-10 ꢀ0 Hz - 100 Hz  
HRS-1ꢀ 18 Hz - 100 Hz  
5.6 KΩ for speaker or Hi-Level inputs  
Drivers:  
Power Line Voltage  
HRS-8  
HRS-10 10" (254 mm)  
HRS-12 12" (304.8 mm)  
8" (203.2 mm)  
1ꢀ0 VAC 50/60 Hz version  
ꢀꢁ0 VAC 50/60 Hz version  
Dimensions  
Extra-large magnet and long throw  
mechanical design yields very high  
back-emf. The result is extraordinarily  
high operating efficiency – that is, more  
acoustic output for each watt of input.  
HRS-8  
10.0" (254 mm) cubed  
HRS-10 11.5" (292.1 mm) cubed  
HRS-12 13.5" (343 mm) cubed  
Weight  
Internal system gain:  
HRS-8  
28 lbs (12.7 kg)  
4ꢀ dB from left input jack to subwoofer  
with volume control at 0dB.  
54 dB with control fully clockwise.  
HRS-10 34 lbs (15.4 kg)  
HRS-12 38 llbs (17.2 kg)  
Finish  
ꢁ6 dB from right input jack to subwoofer  
with volume control at 0dB,  
48 dB with control fully clockwise.  
High-gloss black cabinet, black anod-  
ized amp plate, black fabric grill.  
Line power consumption:  
600 watts average, at maximum continu-  
ous output, 18 to 100 Hz.  
ꢀ,000 watts peak, time limited basis.  
Output levels:  
Peak SPL (including room gain):  
HRS-8  
10ꢀ dB  
HRS-10 105 dB  
HRS-1ꢀ 108 dB  
© 2007 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 91ꢁ-140-00 Rev B  
User's Manual  
16  
 
Troubleshooting  
This subwoofer has been designed  
and built to provide years of trouble-free  
performance. Most problems that occur  
can usually be solved by checking your  
setup, or by making sure that the compo-  
nents connected to the amplifier are on  
and fully operational.  
If the processor’s Sub/LFE output has  
an adjustable crossover frequency,  
make sure that the subwoofer’s own  
crossover point is set to Bypass or part  
of the bass range may be missing.  
Not enough bass in a 5.1  
The following information will help you system  
deal with common problems you may ex-  
5.1 Home Theater processors usually  
perience during normal use. If a problem  
persists, please contact your Dealer for  
assistance.  
have a bass management system which  
allows the bass to be redirected among  
your speakers. For example, the bass  
normally present in the front speak-  
ers can be redirected to play in the  
subwoofer, or the subwoofer can play  
the bass from all the speakers, in addi-  
tion to its dedicated LFE (low frequency  
effects) channel. Make sure that all of  
the bass management options are cor-  
rectly set. The processor may have a  
way of turning the subwoofer output off  
entirely, so check that it is always on.  
Not enough bass  
Check that your processor’s outputs are  
connected to the subwoofer’s line-level  
inputs and not to 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 func-  
tion.  
If your processor has a single sub-  
woofer/LFE output jack, make sure it  
connects to the subwoofer’s Left input.  
If the bass is still not enough after  
checking all the remaining points, use  
a Y cable to connect the processor’s  
single subwoofer/LFE output to the  
subwoofer’s left and right inputs.  
Check that the processor 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.  
If the bass is weak only when playing  
5.1 surround sources, check that your  
processor is correctly set to decode the  
5.1 surround modes, such as Dolby  
Digital or DTS.  
Try moving the subwoofer to a different  
location. See Location on page 10.  
Placing it in a corner will maximize the  
bass output and give the smoothest  
possible response.  
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.  
Home Theater processors usually  
have a way of adjusting the level of the  
subwoofer/LFE output, either using a  
remote control or with a small volume  
knob on the back panel. Make sure that  
this is adjusted correctly.  
Check that your processor or receiver’s  
sub output is turned on. Some systems  
only have a sub output signal when the  
front speakers are set to “small.”  
User's Manual  
17  
 
Hum  
isolator.” This is an inexpensive device  
Adding any component such as a sub-  
fitted in line with the coaxial cable feed.  
woofer 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 processor until you iden-  
tify the problem.  
If you are using the subwoofer’s line-  
level inputs and there is a excessive  
amount of noise or hum present, try us-  
ing the speaker-level inputs as they 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, pro-  
vided that the total current draw does  
not exceed the current safety rating of  
the outlet or circuit.  
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 be-  
tween the component and the preamp.  
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.  
No auto 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 processor, 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.  
No auto turn on  
The subwoofer’s volume control may  
be turned down or no signal is received  
from your processor.  
Check the input connections.  
If you have followed the above guide-  
lines for the power connections and a  
hum is still present, then there is one  
very common problem to consider: a  
“ground-loop” introduced by connecting  
a cable TV line to a VCR or TV, which is  
then connected to the preamp. This can  
be addressed as follows:  
Check on surround systems to be cer-  
tain that a bass signal is being sent to  
the subwoofer.  
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  
processor, TV, or any other component.  
If the hum is caused by the cable TV  
line, then you will need a “ground-loop  
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:  
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.  
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.  
The Sunfire Corporation Warranty  
for the HRS Subwoofer is in effect for  
ONE year from the date of original retail  
purchase. The Sunfire Corporation War-  
ranty covers defects in materials and  
workmanship. The following, however,  
are excluded:  
Service Assistance  
a) Damage caused during shipment.  
We suggest that you read the Limited  
Warranty completely to fully understand  
your Warranty/Service coverage.  
b) Damage caused by accident, mis-  
use, abuse of operation contrary  
to the instructions specified in the  
Sunfire Corporation user’s manual  
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 modification  
or attempted repair by any person  
not authorized in writing by Sunfire  
Corporation.  
Snohomish, WA 98ꢀ90  
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.  
e) Units purchased from unauthorized  
dealers.  
The Sunfire Corporation Warranty ex-  
tends to the original owner or subsequent  
owner(s) during the one year warranty  
period so long as the original dated  
purchase receipt is presented whenever  
warranty service is required.  
NOTE: Before sending in your unit for  
repair, you must call Sunfire for return  
authorization (RA).  
All implied warranties, including war-  
ranties or merchantability and fitness  
for particular purposes, are limited in  
duration to the one year length of this  
Warranty, unless otherwise provided by  
state law.  
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 War-  
ranty.  
Sunfire Corporation’s liability is limited  
to the repair or replacement, at our op-  
tion, of any defective product and shall  
not in any event include property or any  
other incidental or consequential dam-  
ages which may result from the failure of  
this product.  
User's Manual  
19  
 
High Resolution Series  
Subwoofer  
HRS-8, HRS-10, and HRS-12  
Manual part number 91ꢁ-140-00 Rev B  
 

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