Filter
Top Products
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 to
produce tight, floor-rumbling bass down
to 18 Hz, that you can feel as well as
hear.
The subwoofer has an adjustable high
cut filter and speaker level and low level
inputs for easy incorporation into
existing systems, or as part of a
subwoofer/satellite speaker combina-
tion.
The Woofer
To have lots of bass requires moving
lots of air. Your Sunfire True
Subwoofer’s driver 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
massive bass performance.
The Amplifier
The large movement range of the
driver 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 True Subwoofer is capable of
delivering over 1,250 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-electromo-
tive 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 substan-
tially less than 1,250 watts, and is
approximately 120 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.
Note: In this manual, the term “sub/
LFE” is used to denote the subwoofer or
Low Frequency Effects output, com-
monly found on home theater preamplifi-
ers and receivers.
Overview