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Operation
We recommend that the SW10 ll or SW12 power be left
on, which will allow the built-in Auto Mode feature to dis-
able the subwoofer when not in use.
Every speaker, has limits, and it's important to listen for
them. Speaker damage most often results not from brief
loud musical peaks, but from sustained high volume lev-
els in some or all frequencies. For this reason,
extreme volume settings and excessive bass, treble or
equalizer boosts are not recommended.
If you hear unusual distortion or breakup, or notice heat
coming from the woofer, decrease volume immediately,
neutralize any excess bass, treble or equalizer boosts,
and avoid setting any controls to similar extremes again.
Maintenance
Your SW10 ll and SW12 is designed for years of use with
no or minimal maintenance, as long as you avoid expos-
ing it to direct sunlight, high temperatures, or moisture.
Clean cabinets, when necessary, using a damp cloth or
a mild, non-abrasive cleaner; to clean grilles, remove
from speaker and use a soft brush or a vacuum on its
lowest setting. Do not attempt to clean the actual driv-
er.
9.8 Changing the Line Voltage Setting
The SW10 ll and SW12 were designed to operate on two
line voltage settings, 115VAC and 230VAC. In the event
that it is necessary to change the line voltage setting,
begin by turning the power switch to the off position.
Remove all the connections from the amplifier, including
the detachable power cord. Using a flat blade screw-
driver, slide the switch to the correct position. Use the
115VAC position for 110 to 120 VAC, and the 230VAC
position for 220 to 240 VAC. Next you will likely need a
power cord that fits the AC receptacle and you will need
to replace the fuse (see "Changing the Fuse" below)
Changing the Fuse
The SW10 ll and SW12 amplifier's fuse is user-servicea-
ble.
To replace it:
• turn the power OFF
• unplug the power cord
• remove the fuse holder cover (above to the power inlet)
with a flat blade screwdriver
• remove the fuse from the holder and replace it with the
appropriate type.
• reinstall the fuse holder
Always replace the fuse with one of the exact same
specifications.
SW10 ll:
For systems operating at 115 volts, use only a 5x20 mm,
T3A, 250-volt slow-blow fuse.
For systems operating at 230 volts, use only a 5x20 mm,
T2.0A, 250-volt slow-blow fuse.
SW12:
For systems operating at 115 volts, use only a 5x20 mm,
T5A, 250-volt slow-blow fuse.
For systems operating at 230 volts, use only a 5x20 mm,
T2.5A, 250-volt slow-blow fuse.
Troubleshooting
If the SW10 ll or SW12 fails to operate at all when the
Power Switch is turned on, thoroughly check the power
cord, input and output connections
If the SW10 ll or SW12 turns on but the LED indicator
fails to illuminate, mis-wiring or a power surge may have
caused the protection fuse to blow. Replace it with one of
correct type and value.
If the SW10 ll or SW12 turns on but its status LED stays
red, the unit is gone into protect mode, which could be
caused by incorrect wiring, short circuits, or excessive
volume. Turn off the Power Switch on the subwoofer for
two or more seconds to reset, and double check all
speaker cables to be sure that no small metal strands are
shorting the terminals.
If these steps don't restore the SW10 ll or SW12 to oper-
ation, contact your local Authorized NHT Dealer or NHT
for assistance.
Satisfaction
Your satisfaction with your new NHT SW10 ll or SW12
Subwoofer is important to us. Please note the matched
products and accessories we provide for them, and your
warranty, printed on the back of this manual. If you have
any questions regarding your speakers' use, feel free to
call NHT at 1-800-NHT-9993. Enjoy your listening and
viewing!