Russound Sub 105 [Template]

The Complement® SUB105 is a compact, high-powered active
subwoofer with a comprehensive feature set for installer and user convenience.
Its powerful amplifier couples with an acoustically optimized cabinet and
driver to provide high performance with a deep low end and smooth response.
Features For installation fl exibility, the SUB105 offers stereo linelevel
inputs, a line-level LFE input, a balanced line-level stereo input via CAT-5
cable, and stereo speaker-level inputs with pass-through. An adjustable level
control, a variable crossover, and a phase switch allow the user to precisely
balance the sub with the other speakers in the audio system. Frontmounted controls
make it convenient for the user to make adjustments and turn the subwoofer on
and off. An automatic standby mode turns the subwoofer on as soon as it senses
an audio signal and mutes it 20 minutes after the signal ends. A front-panel
power indicator glows amber for standby mode and green for fully on. The
subwoofer’s attractive compact design provides versatile placement options
without compromising the home décor. Applications The SUB105 is ideal for use
in home theater and stereo music systems. The perfect match for Russound
Complement LCR7 on-wall speakers, it can also be used with any Russound in-wall
or in-ceiling speakers. The balanced line-level RNET A/V input makes the SUB105
especially useful when the audio source is remotely located, such as in an
equipment cabinet. By using CAT-5 cable, the installer can avoid transmitting
unbalanced signals over long distances, which can degrade the signal and
introduce noise. Subwoofer Placement Room acoustics and modes Room acoustics
have a great effect on the sound of speakers, especially subwoofers. When sound
is refl ected back and forth between two parallel surfaces, such as opposite
walls in a rectangular room, it creates standing waves. These make bass
response uneven by creating sound peaks and nulls at certain locations within
the room. Because the subwoofer’s location affects how standing waves are
created, correct subwoofer placement is important to avoid such peaks and
nulls. They can’t be fi xed by equalization, which could overdrive the speaker
and amplifi er, causing distortion or damage. The fi rst step toward getting
accurate bass response is to set the subwoofer’s crossover to match the
low-frequency roll-off point of the main speakers. Once you’ve set the
crossover, you can then experiment to fi nd the best possible location for the
subwoofer. Corner placement Placing the subwoofer in a corner will result in
maximum volume, greatest effi ciency, and lowest distortion. This is because
the adjacent walls and fl oor reinforce the fundamental bass tones. However,
corner placement can also make the subwoofer sound boomy, emphasizing a single
frequency above others and resulting in uneven frequency response. Other
placement options To get a smoother, more even frequency response, place the
subwoofer at varying distances from the walls of the room. The key to
minimizing standing waves is to avoid symmetry. Also, place the subwoofer close
to the main speakers. This will help blend and integrate the sound of the sub
and the main speakers. At the very least, keep the subwoofer in the front half
of the room. A common technique for fi nding the best location is to put the
subwoofer in the main listening position, at seated ear height on a sturdy,
nonresonant platform. Play music with ascending and descending bass notes, such
as a jazz recording with a walking bass line. Crawl around the fl oor until you
fi nd the spot where the bass sounds smoothest, and where each bass note has
about the same volume and clarity. Avoid positions where some notes resonate longer
or sound heavier than others. When you’ve found the place where the bass sounds
best, put the subwoofer there. Multiple subwoofers Using multiple subwoofers
provides greater dynamic range and smoother bass response throughout the room
than using only one subwoofer. Placing two subwoofers in the corners behind the
main speakers will reduce room resonances and increase directly radiated sound.
When placing two subwoofers in adjacent corners, position them asymmetrically
to minimize the effects of standing waves.