6
There is no absolute correct setting for the PHASE switch. Depending
on the location of the subwoofer relative to your main speakers and
seating location, one of the settings will produce a better match
with the main speakers, improving bass impact, and in some cases,
improving overall bass level as well.
To determine the correct setting of the PHASE switch, listen to music
with significant impactful bass content with the switch in each
position (it may be helpful to sit in the normal listening position
while someone else changes the PHASE switch between 0 and 180).
Leave the switch in the position that produces audibly louder bass
with more impact.
Ground Lift
Your Sonance Impact Subwoofer features a ground lift switch
available to eliminate most grounding issues. To reduce the ground
current & induced noises, switch the GROUND LIFT from ISOLATED
to GROUNDED. Safety is not affected (see Figure 11).
Replacing the AC Fuse
Your subwoofer is factory-equipped with the following AC fuse:
115V Version:
i12 — 5A, 250V slo-blo; i10 and i8 — 2A, 250V slo-blo
230V Version:
i12 — 2.5A, 250V slo-blo; i10 and i8 — 1A, 250V slo-blo
To replace the fuse, unplug the power cord from the Power Cord
Connector and use a screwdriver to remove the fuse holder
(see Figure 11).
Power Connection
Your Sonance Impact Subwoofer features a removable IEC power
connector (see Figure 11). Plug the female end of the power cord
into the power cord connector on the subwoofer’s rear panel and
plug the male end into a grounded wall socket. Do NOT plug the
subwoofer’s power cord into a convenience outlet on any other
audio or video component.
CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE,
REPLACE THE FUSE WITH ONLY THE SAME TYPE AND RATING.
IMPORTANT: DO NOT PLUG THE POWER CORD INTO THE WALL
OUTLET UNTIL ALL SYSTEM CONNECTIONS HAVE BEEN MADE
AND VERIFIED. NOTE: IF YOU NEED TO USE AN EXTENSION
CORD, USE ONLY A HEAVY-DUTY (14-GAUGE OR LARGER)
EXTENSION CORD TO AVOID STARVING THE SUBWOOFER OF
ALL THE CURRENT NECESSARY FOR FULL-POWER OPERATION.
Subwoofer Adjustments
SONARC For Subwoofers
Every Sonance subwoofer comes with SONARC built in. SONARC for
subwoofers is an app driven room correction software that allows
you to tune your subwoofer perfectly for the environment it is
placed in. You can download the free app from the Apple App Store.
The app will work on any iOS device. For more information visit
Sonance.com/sonarc/subwoofers.
Volume Adjustments
The VOLUME control sets the subwoofer’s volume output. When
setting the subwoofer’s VOLUME control by ear, try to find a volume
setting where the bass sounds balanced on both music and films.
Listen to several different music recordings and film soundtracks that
contain strong bass passages and try to find a setting for the VOLUME
control that doesn’t over-emphasize the bass or make it sound weak
(see Figure 10).
The most accurate way to set the VOLUME control is with calibrated
test noise or test tones and a sound-pressure level (SPL) meter or
real- time analyzer. There are several CDs and DVDs that contain
subwoofer test signals. If you use an SPL meter, set the subwoofer’s
VOLUME control so that it plays at the same volume as the system’s
other speakers.
Crossover Adjustments
The Crossover control adjusts the subwoofer’s internal crossover
frequency between 50Hz and 250Hz. The crossover’s slope is
18dB/octave. The higher you set the Crossover control, the higher
in frequency the subwoofer will operate. Use the Crossover control
to achieve a smooth transition of bass frequencies between the
subwoofer and your main speakers. Generally, the Crossover control
should be set at a lower frequency if your main speakers have larger
woofers, and at a higher frequency if your main speakers have
smaller woofers (see Figure 10).
When setting the Crossover control by ear, listen for the smoothness
of the bass. If the bass seems too strong at certain frequencies
(especially if your main speakers have larger woofers), try a lower
Crossover control setting. If the bass seems too weak at certain
frequencies (especially if your main speakers have smaller woofers),
try a higher Crossover control setting.
Ideally, the Crossover control should be set to the frequency where
your main speakers’ low-frequency response rolloff is –3dB.
Phase Adjustments
When the subwoofer’s PHASE switch is in the 0 position, a positive
input voltage will cause the woofer cone to move out (towards the
room). When the PHASE switch is in the 180 position, a positive
input voltage will cause the woofer cone to move in (away from the
room) (see Figure 10).
FIGURE 10: SUBWOOFER ADJUSTMENTS
FIGURE 11: POWER CORD CONNECTOR & FUSE HOLDER
Sonance
Impact Subwoofer
Sonance
Impact Subwoofer
(i12 shown)
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