High Resolution Series
Subwoofer
HRS-8, HRS-10, and HRS-12
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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 find out more about this and other Sunfire products,
please visit our website: www.sunfire.com
User's Manual
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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:
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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.
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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.
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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.
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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.
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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.
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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.
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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 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
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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
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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.
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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 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.
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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.
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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
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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.”
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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
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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:
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
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High Resolution Series
Subwoofer
HRS-8, HRS-10, and HRS-12
Manual part number 91ꢁ-140-00 Rev B
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