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User's Manual

5

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 16 Hz, that you
can feel as well as hear.

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 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.

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.

The Amplifier

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 power amplifier within your Sunfire

Subwoofer is capable of delivering over
2,700 watts into a 3.3 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 3.3 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 2,700 watts, and is approximately
380 watts for most musical material on
the loudest passages.

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.

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
website: www.sunfire.com.

Overview

Содержание True Subwoofer Signature

Страница 1: ......

Страница 2: ...onnected to a power supply only of the type described in these operation instructions or as marked on the Component 9 Power Cord Protection Power supply cords should be routed so that they are not lik...

Страница 3: ...igurations 11 Adjusting the controls 15 Specifications 16 Troubleshooting guide 17 Limited warranty 19 Service assistance 19 Contents To find out more about this and other Sunfire products please visi...

Страница 4: ...ously variable volume level control Soft clipping circuit allows graceful overload and prevents speaker damage due to clipping Gold plated inputs and outputs Dear Friend Thank you for purchasing my Su...

Страница 5: ...hould position the driver with the bump towards a protected side The Amplifier The large movement range of the drivers creates greater air pressure inside the box than a conventional woofer Therefore...

Страница 6: ...pro duce frequencies up to 100 Hz With the control fully counter clockwise the subwoofer reproduces up to 30 Hz Rotate the control until the bass sounds natural If the mid bass sounds natural but you...

Страница 7: ...r a signal is present at the inputs of the subwoofer The high pass 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 pas...

Страница 8: ...g 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 Heat rise Allow adequate ventilation around the metal control panel of the...

Страница 9: ...uld 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 Some patch cords can be a very tight fit and...

Страница 10: ...bwoofer s performance Moving the subwoofer from one corner to another can have a major effect on the bass response Remember to keep it at least two or three feet away from any TV screen computer VCR o...

Страница 11: ...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 amplifier If you have a home...

Страница 12: ...R bass The opening scene in 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 Subwoofer utilizes differential gain on th...

Страница 13: ...e subwoofer s fixed high pass crossover point The signals coming out of the subwoofer s high pass outputs are not affected by any of the controls They are just a copy of the signals going in except th...

Страница 14: ...ction of your receiver s power is transferred to the subwoofer There is no need to use the Speaker Level inputs if you are using a separate amplifier and preamplifier Such systems are best connected u...

Страница 15: ...ill 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 recon...

Страница 16: ...ft input with volume control at 0dB 60 mVrms with volume control fully clockwise 0 75 Vrms from right input with volume control at 0dB 200 mVrms with volume control fully clockwise Input impedance 15...

Страница 17: ...r using a remote control or with a small volume knob on the back panel Make sure that this is adjusted correctly Check that your preamplifier or receiver s sub output is turned on Some systems only ha...

Страница 18: ...hat 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 hum is caused by the cable TV line then you will need...

Страница 19: ...y defective product and shall not in any event include property or any other incidental or consequential damages which may result from the failure of this product Some states do not allow limitations...

Страница 20: ...Manual part number 913 038 00 Rev A...

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