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12" Woofer/1000W Amp: The Sunfire High Resolution series HRS-12 powered
sub combines a 1,000W Tracking Downconverter amplifier, and an 12" long throw,
High Back-emf woofer. This powerful combination produces as much bass as several
15" drivers mounted in a cabinet the size of a small refrigerator. And, its
extended frequency response means that the powered subwoofer is the perfect
match to virtually any loudspeaker.
- High Back EMF: The 12" woofer is highly efficient thanks to
Sunfire's specially designed voice-coil and oversized magnet that produce
High Back-emf electromotive force) and very high output.
- Tracking Downcoverter Technology: Sunfire's patented Tracking Downcoverter power supply design dynamically adjusts
the output of Sunfire amplifier to suit the requirements of the incoming audio
signal. Remarkably, this power supply and amp design remains incredibly cool
while delivering up to 50% more voltage than the competition. More voltage means
more control of the subwoofer itself. And more control means deeper, more
accurate bass, something you'll truly appreciate every time you listen to your
favorite music and movies. On-demand power is available for even the most
demanding bass tracks, while its high efficiency keeps the amplifier cool to the
touch; up to 30% cooler than the competition.
Soft Clipping Circuit: A 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. If the input signal is
driven even further, a Soft Clipping circuit is enabled to prevent driver
MDF Enclosure: Sunfire's High Resolution series HRS-12 powered sub uses
a heavy-duty 3/4" MDF enclosure to resist vibration and tighter bass.
Controls: Controls for adjusting the volume, crossover frequency and
phase, allow the subwoofer to be perfectly matched to any listening environment
and audio components.
- Volume Level: This control lets you match the output level of the
subwoofer to the level of your other speakers. The subwoofer output will
increase as this control is
- Low Pass Crossover: This control changes the high frequency
cutoff point. With the control set to 100 Hz, 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-clock wise the subwoofer reproduces a
narrow range, up to 30 Hz. Rotate the control until the bass sounds natural.
If the mid-bass sounds natural but you want more low bass, turn this control
down a little, then turn the Volume control up by about the same amount.
This increases the low-bass output while leaving the mid-bass output the
- Phase: This control changes the relative phase (0°-180°)
of the subwoofer with respect to the other speakers. Use this control to
help blend the subwoofer with the rest of the sys tem. This is accomplished
by adjusting the control in small increments as you listen for the most bass
at your listening position. As a final adjustment, readjust the Crossover
Frequency and Volume controls after the Phase has been set.
Connections: The Sunfire HRS-12 powered sub is fitted with with
line-level and speaker-level connections for added flexibility.
- LFE/RCA Inputs: Connect these unbalanced inputs with RCA-type
patch cords to the line-level outputs of your receiver or preamp. If your
preamplifier or receiver has a single sub/LFE output, connect it to Left RCA
- Speaker Level Inputs: If you are using a receiver which only has
speaker-level outputs, you can connect it using the powered sub's
speaker-level inputs. These binding-post speaker terminals can accept bare
wire (up to 10AWG) pin-connectors, or banana plugs (dual or single).
- Line-Level Outputs: These stereo RCA output jacks are a copy of the
signals going into the powered sub's inputs, except the bass has been
removed by a fixed high-pass crossover circuit (75Hz). The output is not
affected by the subwoofer's controls.
Auto Turn-On/Standby: The powered subwoofer has a special
power circuit which automatically turns the powered subwoofer on when a signal
is fed to the loudspeaker and turns it off when there is no signal present
(approximately 15 minutes).
Applications: The High Resolution series HRS-12 powered sub from
Sunfire is designed for medium-sized and multi-purpose rooms, where both music
and movies are enjoyed.
Placement: Although low frequencies are non-directional,
factors such as room reflections, standing waves, resonance and absorption will
strongly affect your subwoofer's performance. Moving the subwoofer from one
location to another can have a major effect on the bass response. The Sunfire
HRS-12 powered subwoofer is designed to be placed in a corner for optimum