U s e r ’ s M a n u a l
M o d e l 
SW10 ll 
SW12
P o w e r e d S u b w o o f e r
IMPORTANT SAFETY INSTRUCTIONS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE. REFER TO QUALIFIED SERVICE PERSONNEL.
The lightning flash with the arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
1.READ INSTRUCTIONS - All safety and operating instructions should be read before the appliance is operated.
2.RETAIN INSTRUCTIONS - Safety and operating instructions should be retained for future reference.
3.HEED WARNINGS - All warnings on the appliance and in operating instructions should be adhered to.
4.FOLLOW INSTRUCTIONS - All operating and use instructions should be followed.
5.WATER AND MOISTUREThe appliance should not be used near water - near bathtub, washbowl, kitchen sink, laundry tub; in a wet basement near a swimming pool, etc.
6.CARTS AND STANDS - Do not place this product on an unstable cart, stand, tripod, bracket, or table. The appliance should be used only with a cart or stand that is recommended by the manufacturer.
7.VENTILATION - The appliance should be situated so that its location and position do not interfere with proper ventilation. The appliance should not be situated on a bed, sofa, rug, or any surface that may obstruct cabinet openings.
8.HEAT - The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other devices (including amplifiers) that produce heat.
9.POWER SOURCES - This product should be operated only from the type of power source indicated on the marking label. If you are not sure of the type power supply in your home, consult your product dealer or local power company. For products intended to operate from battery power or other sources, refer to the operating instructions.
10.POWER CORD PROTECTION - Power supply cords should be routed so that they are not likely to be walked upon or pinched by items placed upon or against them, paying attention to cords and plugs, convenience receptacles, and the point where they exit from the appliance.
11.POLARIZED PLUG - This appliance is equipped with a polarized line plug (a plug having one blade wider than the other). This plug will fit into the power outlet only one way. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug still fails to fit, contact your electrician to replace your obsolete outlet. Do not attempt to defeat this safety feature.
12.LIGHTNING - For added protection for this product during a lightning storm, or when it is left unattended and unused for long periods of time, unplug it from the wall outlet and disconnect the antenna or cable system. This will prevent damage to the product due to lightning and power line surges.
13.OVERLOADING - Do not overload wall outlets, extension cords, or integral convenience receptacles, as this can result in a risk of fire or electricshock.
14.CLEANING - Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.
15.NON-USE PERIODS - This amplifier should be unplugged from the outlet when the appliance is left unused for a long period of time.
16.OBJECT AND LIQUID ENTRY - Never push objects of any kind into this product through openings, as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock. Never spill liquid of any kind on this product.
17.DAMAGE REQUIRING SERVICE - The appliance should be serviced by qualified personnel when:
a.The power supply cord or plug has been damaged; or
b.Objects have fallen on or liquid has been spilled into the appliance; or
c.The appliance has been exposed to rain; or
d.The appliance does not appear to operate normally or exhibits a marked change in performance; or
e.The appliance has been dropped or the enclosure is damaged.
18.SERVICING - Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel. For service warranty information call the NHT Hotline number: 1-800-NHT-9993.
19.REPLACEMENT PARTS - When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or that have the same characteristics as the original part. Unauthorized substitution may result in fire, electric shock, or other hazards.
20.SAFETY CHECK - Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition.
CAUTION
TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
Thank you for your purchase of the NHT SW10 ll or SW12 powered subwoofer.
Like all NHT loudspeakers, the SW10 ll and SW12's development has been guided by the study of human hearing, it’s design rigorously tested, and its components optimized to deliver clean, clear musical sound.
Since the quality of your speakers is one of the most important factors in maximizing the sound you'll get from your music and home theater system, we're sure that you'll find your purchase of the SW10 ll and SW12 a good investment, and invite your comments.
If you find your experience with the SW10 ll and SW12 as satisfying as we believe you will, and wish to enjoy its high quality sound through your entire system, you'll find information about other sonically matched NHT Super Series loudspeakers on the back of this manual.
Background
The NHT SW10 ll and SW12 Powered Subwoofer is a compact, versatile and powerful amplified subwoofer designed to provide low frequency reinforcement for high performance audio and home theater systems.
The SW10 ll and SW12 features:
•line-level and speaker-level inputs, for connection with all types of receivers or other audio components
•independent gain, phase and low pass filter controls
•boundary control for adjusting system sound for various room placement
Please take a few minutes to read through this owner's manual before setting up your speakers; this information will help you get the most out of them. Also, please keep the SW10 ll or Sw12’s packaging to use in case you move or transport them.
If you have questions at any time during setup or use, feel free to call your NHT dealer or our Toll-Free Customer Hotline at 1-800-NHT-9993.
Placement
Note: To prevent the SW10 ll and SW12 subwoofer amplifier from overheating, always be sure to provide adequate space for proper ventilation. Do not place the subwoofer directly against the wall or any other surface.
The key to placing your subwoofer for optimal enjoyment
is to remember that low frequencies produce sounds with long wavelengths, which interact in complex ways with room boundaries, such a walls and corners, and other large objects as well.
Placing the subwoofer near to a room boundary will tend to increase its apparent bass output, but may result in "boomy" or "muddy" sound. Conversely, placing it farther away from room boundaries will tend to decrease its apparent bass output, but may result in improved articulation and clarity.
When possible, place the subwoofer in the same horizontal plane and along the same wall as the main speakers.
And since small changes in subwoofer position can have a significant effect on sound, experimenting with the effects of different placements in your own listening/viewing room is the key to finding the sound you like best.
SW10 ll and SW12 Features & Controls
Volume: This control allows you to adjust the gain of the Subwoofer relative to the rest of your system. Many listeners make the mistake of setting subwoofers too loud, which can cause excess bloat and loss of detail and musicality. A properly calibrated subwoofer blends in with the speakers and does not call attention to itself. To properly set volume:
•Turn down the volume control on the SW10 ll or SW12 to its lowest position (counter-clockwise).
•Turn on your audio system, including the SW10 ll or SW12. Play some music you are familiar with and set your receiver/preamplifier volume to a comfortable listening level.
•Slowly increase the volume of the SW10 ll or SW12, listening for proper frequency balance. When balanced, you will hear improved bass extension, but not be aware
that it is coming from the subwoofer.
From this point on, the volume control on your receiver/preamplifier will control the overall volume of your system, including the subwoofer.
The Boundary EQ: This is a feature unique to NHT Evolution products. Reflective boundaries (such as walls) reinforce a speaker’s bass output (3dB for two walls, 6dB for a corner) if the subwoofer is placed near them. Conversely, placing a subwoofer out in the room results in a relative decrease in bass output. Boundary reinforcement may lead to low frequency response that
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