U s e r ’ s M a n u a l
M o d e l 
SubOne i
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 electric shock.
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.
Table of Contents
system?
to you
or
1
SubOne i Specifications
and outboard controller
from Sunfire® Corporation
40-180Hz, 18dB/octave
12dB/octave (line-level)
(high-level)
for line level and LFE input for speaker level input
for line level high-pass output for speaker level high-pass
for subwoofer output from controller
is present for 45 minutes
black powder coated chassis
! Design
NHT products are designed to deliver refined, musical sound from attractive and affordable efforts are guided by the study of human hearing and are optimized for real-world use. Every
undergoes rigorous testing and quality control at the factory to ensure you years of listening pleasure
The NHT SubOne i Powered Subwoofer System is a compact, versatile and powerful subwoofer provide low frequency reinforcement for high-performance audio and home theater systems. The powered by a built-in 250-watt amplifier using patented Sunfire® technology that allows it to deliver narily dynamic high current output.
The SubOne i features an outboard Controller that allows convenient adjustment of volume, filtering controls. It also provides line-level and speaker-level inputs and outputs for connection with all receivers or separate audio components. To accommodate the differing listening preferences music and home theater, the Controller offers a Flat / Video Contour switch that maintains flat music listening and adds extra midbass output for video playback. The SubOne i subwoofer and connected via the supplied 20’ RCA cable.
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(1)Power Switch - Activates power for subwoofer
(2)AC Power Input - Power cord receptacle.
(3)Subwoofer Input - Input for RCA connector from Controller.
(4)Power Indicator - The light shows green when the system is on, shows red in standby
(5)Standby Indicator - The amber light is lit when the subwoofer is in standby mode.
(6)Power Indicator - The green light is lit when the system is on.
(7)Volume Control - Adjusts the loudness of the subwoofer independently of the main speakers.
(8)Flat / Video Contour Switch - Selects response mode of subwoofer.
(9)LFE Gain Control - Adjusts amount of LFE in the mix
(10)Power Input - To accept power from the LL1 power supply
(11)Subwoofer Phase Selector - 2-position selectable phase control for subwoofer.
(12)Low Pass Filter - Continuously variable low pass crossover control.
(13)LFE Input - Line Level RCA Low Frequency Effects input.
(14)Line In - Line-level RCA input connectors.
(15)Satellite Line Out - Line-level RCA output jacks to receiver / main amplifier.
(16)Output to Satellites - Barrier strip for speaker-level connection to main speakers.
(17)High Level Input - Barrier strip for speaker-level input from receiver / amplifier.
(18)Subwoofer Gain Selector - Allows optional attenuation of SubOne i gain.
(19)High Pass Filter - 3-way selectable high pass crossover for satellite line out.
(20)Subwoofer Output - RCA cable for connection to SubOne i subwoofer.
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! Placement
Experimentation is the key to finding the best location for the SubOne i in your listening environment. When possible, place the subwoofer in the same horizontal plane and along the same wall as the main speakes. Low frequencies produce long wavelengths and thus interact with room boundaries significantly. Placing the subwoofer nearer to a room boundary (walls, corners) will tend to increase its bass output, but may result in “boomy” or “muddy” sound. Conversely, placing the subwoofer farther away from room boundaries will tend to decrease its bass output, but may result in improved articulation and clarity.
Note: To prevent the SubOne i 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.
Position the subwoofer so that it does not radiate sound directly into a wall or floor, and ensure that it faces into the room, unobstructed by large furnishings. If you are using two subwoofers, the greatest improvement in low frequency response is usually achieved by placing the second subwoofer asymetrically on the oppostite side of the room from the first. For example, if one sub is placed in the front left corner of the room, the second should be placed along the front (same) wall about 1/3 of the way into the room from the right corner. Avoid placing two subwoofers symmetrically (such as in two corners), as it will tend to exaggertate standing waves. As the SubOne i is not shielded, do not place it in close proximity to a television, or picture discoloration will occur.
The SubOne i Controller is most conveniently placed in a rack with other equipment, although it may also be placed on top of the subwoofer.
! Four Connection Methods
Caution: Prior to connecting the SubOne i to your audio system, it is important that all AC power connections to associated components (receivers, amplifiers, preamplifiers, processors, etc.) are either unplugged or turned off. Do not plug in or connect the SubOne i subwoofer to AC power until all connections have been made.
The SubOne i subwoofer and Controller are connected via a single 20-foot-long RCA cable. The subwoofer is plugged directly into an AC outlet in the wall. The SubOne i Controller receives power via the LL1 15VAC Power Supply. If the distance between the subwoofer and Controller in your room is greater than 20 feet, your NHT dealer offers RCA cables in varying lengths.
A subwoofer’s performance in the context of your audio / video system is highly dependent upon its interaction with your main (largest) speakers. Since a subwoofer is designed only to provide low frequency response, it is important to connect it in a manner that ensures seamless integration with your speakers. There are four possible connection methods outlined in this manual. The best method for you depends on the size of your front L & R speakers and the connection options available on your receiver or preamplifier (see next section). To help you determine the best way to connect the subwoofer to your system, consider the following suggestions:
1. If you have large (full-range) main speakers...
1st Choice: Method #1 (line-level with or without LFE connection with high pass filter loop) 2nd Choice: Method #2 (line-level and/or LFE input connection with no high pass filter loop) 3rd Choice: Method #4 (speaker-level connection with no high pass filter loop)
If your main speakers have generous bass response and you are adding a subwoofer, the resulting sound could be “muddy.” You have the option of sending the main speakers a high-pass filtered signal (Method #1). With the low bass information removed from the signal before it reaches the speakers, all low frequencies are reproduced exclusively by the subwoofer. With this configuration it is usually easier to achieve smooth low frequency response, as the subwoofer reproduces a different frequency range than the speakers. Use the 50Hz high pass setting.
If you want to run the main speakers full-range, or if you have a receiver with no “Pre-Out” and “Main- |
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In” (see next section), you can use the subwoofer only to provide low bass reinforcement (Connection |
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