Advertisement
Advertisement
я = © г <= ivianual ——! Sub Two i Powered Subwoofer INMFORIANI SAFE! Y 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 MOISTURE- The 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 manu- facturer 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. y Specifications 2 Design 2 Diagrams of SubTwo i subwoofer and Controller 3 Placement 4 General Connections 4 Four Connection Methods 5 Which connection options are available in my system? 6 Explanation of Features 6 SubTwo i Connection Method #1 9 SubTwo i Connection Method #2 10 SubTwo i Connection Method #3 11 SubTwo i Connection Method #4 12 Fine Tuning the Subwoofer 13 Operation 14 Maintenance 14 Troubleshooting 14 Glossary of Terms 15 «u Warranty Information 16 , Thank you for your purchase of the NHT SubTwo i Powered Subwoofer System. Please take a few moments to read through this User's Manual prior to installing your new subwoofer. The information provided can help you to obtain maximum performance from your audio system. For your convenience, a glossary on page 13 explains some technical terms. If you have questions or require assistance at any time during the installation or operation of your new powered subwoofer system, please call your local NHT dealer or our Toll-Free Customer Service Hotline at: 1-800-NHT 9993 Please retain the SubTwo i packaging to protect the system in the event that you move or transport it. - System type: Acoustic suspension subwoofer with built-in amplifier and outboard controller - Driver complement: Two 12” long-throw polypropylene woofers - Power output: 500 watts mono into 6 ohms, under license from Sunfire® Corporation - Frequency response: 21Hz - 180Hz +/-3dB - Distortion: Less than 0.3% at full power - Crossover: Low-pass continuously variable between 40-180Hz, 18dB/octave High-pass continuously variable between 40-120Hz, 12dB/octave Fixed high-pass at 100Hz (8 ohms), 6dB/octave (speaker-level) - Controller input connectors: Gold plated Stereo RCA jacks for line level input Gold plated RCA jack for line level and LFE input Gold plated barrier strip for speaker level input - Controller output connectors: Gold plated Stereo RCA jacks for line level high-pass output Gold plated RCA jacks for line level and LFE output Gold plated barrier strip for speaker level high-pass output Gold Plated Stereo RCA connectors for subwoofer output + Subwoofer input connectors: Gold plated RCA connector from controller - Phase Control: Continuously variable between 0 and 360 degrees - Standby Mode: (defeatable) Automatic when no signal is present for 45 minutes - Weight: Subwoofer - 70 Ibs. Controller - 6.5 Ibs. - Dimensions: Subwoofer - 27"H x 13"W x 16"D Controller - 2”H x 16”W x 8’D - Finish: Subwoofer - Black high gloss piano finish Controller - matte black anodized front panel, black painted chassis J e Design NHT products are designed to deliver refined, musical sound from attractive and affordable packages. Our efforts are guided by the study of human hearing and are optimized for real-world use. Every NHT product undergoes rigorous testing and quality control at the factory to ensure you years of listening pleasure. The NHT Sub Two ¡ Powered Subwoofer System is designed to provide clean and powerful low frequency rein- forcement for high-performance audio and home theater systems. The SubTwo i features two long throw 12" woofers mounted side by side in a solidly built, sealed rectangular enclosure that allows either vertical or hori- zontal placement. The system is powered by a built-in 500 watt high current amplifier. The amplifier uses patented Sunfire technology to deliver extraordinarily dynamic output while generating little heat. The SubTwo i features an outboard Controller that allows convenient front-panel adjustment of volume, filtering and phase controls. It also provides line-level and speaker-level inputs and outputs for connection with all types of receivers or separate audio components. To accommodate the differing listening preferences common for music and home theater, the Controller offers an Flat / Video Contour switch that maintains flat response for music listening and adds extra midbass output for video playback. The SubTwo i subwoofer and Controller are connected via the supplied 20° RCA cable. CEE Sub Two ! Powered Subwoofer Subwoofer System Back FROM SubOne | CONTROLLER ©) A a e ЛЬ Vo 100120V ~ 50-£0Hz BOOW A 3 BE 2 MANUFACTURED UNDER LICENSE FROM SUNFIRE CORP Controller Front (Es) 4) VS VV Controller Back Sub Two 1 e eE Controller Power Standby (1) Power Switch - Activates power for subwoofer and Controller. (2) AC Power Input - Power cord receptacle. (3) Subwoofer Input - Input for RCA connector from Controller. (4) Power Indicator - The green light is lit when the system is on, red for 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. (8) LFE Gain Knob - Adjusts the amount of LFE in the mix. (9) Flat / Video Contour Switch - Selects response mode of subwoofer. (10) Video Contour Knob - Continuously variable bass boost in Video Contour mode. e 2) Subwoofer Phase Switch - 2-position selectable phase starting point. (11) High Pass Filter Knob - Continuously variable high pass crossover for satellite line out. (13) Subwoofer Phase Knob - Continuously variable phase control. (14) LFE Filter Bypass Switch - Activates or bypasses low pass filter for LFE input a (15) Low Pass Filter Knob - Continuously variable low pass crossover control. (16) AC Power Input - Power cord receptacle. (17) Mono / Stereo Switch - Selects between single and dual subwoofer output. (18) Subwoofer Gain Selector - Allows optional attenuation of SubTwo i gain. (19) Subwoofer Output - RCA cable for connection to SubTwo i subwoofer. (20) LFE Input / Thru - Line Level RCA Low Frequency Effects input/thru. (21) Line In - Stereo Line-level RCA input connectors. (22) Satellite Line Out - Line-level RCA output jacks to receiver / main amplifier. (23) Output to Satellites - Barrier strip for speaker-level connection to main speaks (24) High Level Input - Barrier strip for speaker-level input from receiver / amplifier. 3 AN AYUDA млн, Y oUuWwuUUITTo VGL youu LO 1iCal SIEG Vass, WINCH IS PISGISTADIG LO INONO Dass when listening to music. When stereo bass is present, stereo subwoofers give a greater sense of space and three-dimensionality, enhancing the sense of being where the music was recorded. Using two subwoofers can also improve the "room response" of your system, providing smoother, flatter bass (see the Placement section for more information). The Controller has a mono switch so that you can still use two subwoofers if there is no stereo bass information present (as is the case with the LFE channel in home theater systems) and you require more low frequency output than a single subwoofer can provide. ® Placement > Experimentation is the key to finding the best location for the SubTwo i in your listening environment. When possible, place the subwoofer in the same horizontal plane and along the same wall as the main speakers. Low frequencies correspond to 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. Make sure to position the sub- woofer 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. As the SubTwo i is not shielded, do not place it in close proximity to a tele- vision, or picture discoloration will occur. The subwoofer's rectangular enclosure shape allows you the flexibility of placing it either vertically or horizon- tally, depending on the most appropriate configuration in your room. If placing the enclosure on carpet, attach the three included stick-on metal cones to the bottom surface of the enclosure (whichever it is) in an equilateral triangle formation. If placing the enclosure on hard or scratchable surfaces such as wood floors, you may use the four included rubber stick-on feet instead. Note: To prevent the SubTwo i subwoofer amplifier from overheating, always be sure to provide /N adequate space for proper ventilation. Do not place the subwoofer directly against the wall or any other surface. You can improve the sound of the low frequencies in your room by using two subwoofers. As mentioned above, low frequencies have long wavelengths that interact with the room boundaries producing standing waves (the waves "pile up" or "stand" at surfaces in the room where the dimensions of the room are equal in length to the wavelengths being reproduced). If you walk around your room while playing music with low frequency content, you'll notice that in some places (such as near walls) the bass is very loud, while in others it is quiet (such as | in the middle of the room). These peaks and dips in loudness are the result of standing waves. By carefully placing two subwoofers, you can use one to fill in where the other quiet, and vice-versa. A good place to begin is with one subwoofer in a corner and the other along a shared wall about one third of the way into the room. Try to avoid placing both subwoofers symmetrically (such as in two corners) because symmetric placements will tend to exaggerate standing waves. The SubTwo i Controller is most conveniently placed in the rack with the other equipment, although it may also be placed on top of the subwoofer. e General Connections Caution: Prior to connecting the SubTwo i to your audio system, it is important that all AC power /N connections to associated components (receivers, amplifiers, preamplifiers, processors, etc.) are either unplugged or turned off. Do not plug in or connect the Sub Two i subwoofer to AC power until all connec- tions have been made. The SubTwo i subwoofer and Controller are connected via a single 20-foot-long RCA cable. The SubTwo i Controller receives power via the LL-1 power supply. If the distance between the subwoofer and Controller in your room is greater than 20 feet, your NHT dealer offers RCA cables of varying lengths. CE are packaged separately, giving you the ability tO add all aUliliolidal sSULWUUITT SHLIVOULE Ra afl BARE EEE i system. In the stereo configuration, each subwoofer is connected by its own RCA cable to one of the sub- woofer output jacks in the back of the Controller. ® Four Connection Methods 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 pos- sible connection methods outlined in this manual. The best method for you depends on the size of your front L 8 R speakers and the connection options available on your receiver or preamplifier (see next section). lo 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 repro- duced exclusively by the subwoofer. With this configuration it is usually easier to achieve smooth low frequen- cy response, as the subwoofer reproduces a different frequency range than the speakers. Use approximatly a 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-In” (see next section), you can use the subwoofer only to provide low bass reinforcement (Connection Methods #2 and #4). The downside is that sending the speakers a full-range signal can make it difficult to integrate them with the subwoofer, as their combined low frequency output can cause irregularities (peaks and dips) in the room's low frequency response. In this case, the subwoofer's low pass setting should be quite low and used only to fill in the lowest octave. Method #3 is not recommended with large main speakers. 2. If you have small (bookshelf) main speakers... 1st Choice: Method #1 (line-level and/or LFE input connection with high-pass filter loop and Dolby® Digital receiver set to ‘small’) 2nd Choice: Method #3 (speaker-level connection with fixed high-pass filter) If your main speakers are smaller bookshelf-type models with limited bass response, it is advisable to send them a high-pass filtered signal (Method #1 or #3). All low bass information is removed from the signal before it reaches the speakers, and all low frequencies are reproduced exclusively by the subwoofer. Because the L & R speakers receive a signal containing only information that falls within their specified frequency response range, they exhibit reduced distortion, greater dynamic range and power handling. Use a 75Hz to 110Hz high pass setting. Alternately, you can run small main speakers full range and use the subwoofer to reproduce all the low bass fre- quencies below their response capabilities (Methods #2 and 4). While simple, this configuration does not remove the burden of low frequencies from the L & R speakers and may limit their output at higher volumes. 1) If you have a separate preamplifier and main amplifier, all four of the connection methods are avaiable to you. Method #1 is recommended. 2) If you have an integrated amplifier or receiver (hereafter called “receiver”) with “Pre-Out” and “Main-In” con- nections, all four of the connection methods are available to you. Method #1 is recommended. 3) If you have a receiver with "Pre-Out" or "Line-Out" connections, but no main in connections, you may use Methods #2, #3 or #4. 4) If you have a receiver with "Pre-Out" or "Line-Out" connections, you may use Methods #2, #3 or #4. 5) If your receiver or processor has a "Subwoofer Out" or "LFE Out" connection, you may use any of Methods #1 through #4, or simply connect the "Subwoofer Out" or "LFE Out" jack to the SubTwo | Controller. See the Use of the LFE Input and LFE Gain Control section for more information. Detailed descriptions and diagrams of all four connection methods are found on pages 8-11. e Explanation of Features The VOLUME CONTROL allows you to adjust the volume of the subwoofer relative to the rest of the 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. Observe the following guidelines for volume setting: Turn down the volume control on the Sub Two ¡ Controller to its lowest position (counter-clockwise). Turn on your audio system, including the SubTwo i. Play some music you are familiar with and set your receiver/pre- amplifier volume to a comfortable listening level. Slowly increase the volume on the SubTwo i Controller, lis- tening for proper frequency balance. When the subwoofer output is balanced with the rest of the system, you will hear improved bass extension, but you should be unaware 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 sys- tem, including the subwoofer. Use of the LFE Input and LFE gain Control (LFE = Low Frequency Effects) If your receiver/processor has a "Subwoofer Out" or "LFE out" jack, you can connect that jack to the LFE Input on the back of the SubTwo i Controller. You can configure your system as follows: (a) This is the recommended method as it the most likely to lead to optimum results for both music and movies. Connect your receiver/processor as shown in the section labeled Connection Method #1. Connect the LFE out- put of your receiver to the LFE Input of the Controller as discussed above. Using music, adjust the Controller so that the main speakers and the subwoofer are well integrated (see the fine tuning section for help). Set up your receiver/processor so that the main speakers are run in the "large" mode and set the subwoofer to "on" or "yes." Use the LFE gain control to add the desired level of low frequency effects (in conjunction with the Audio/Video switch) for home theater use. Also, in the set up of your receiver/processor, set the crossover fre- quency for the subwoofer to the highest frequency available (typically 200Hz) so that the crossover in the receiver does not interfere with the crossover in the SubTwo i Controller. Also, disable any bass equalization controls that may be available in the receiver/processor. Note: Setting the speakers as "large" means that they will be fed a full range signal. They may or may not receive the information from the low frequency effects channel depending on the bass management features of your receiver/processor. Therefore we recommend that you set the subwoofer setting to "on" as AE that they are rolled off below 80Hz, limiting the amount of bass Information they must reproduce (and they receive no information from the low frequency effects channel). Setting the main speakers to small is not nec- essary when they are properly integrated with the SubTwo i since the subwoofer and main speakers together form a full range system. «ЭР (6) Run an interconnect from the LFE output on your receiver/processor to the LFE Input on the SubTwo i Controller. DO NOT CONNECT THE RECEIVER TO THE LINE IN AND SATELLITE OUT CONNECTORS ON THE CONTROLLER (THERE SHOULD BE ONLY ONE INTERCONNECT GOING FROM THE RECEIVER/PROCESSOR TO THE CONTROLLER). Use the receiver/processor to adjust the settings for crossover frequency and level for the main speakers and subwoofer. Set the LFE Filter switch to "Bypass" so that the low pass filter in the Controller doesn't interfere with the low pass filter in the receiver/processor. Set the LFE Gain control and volume control on the Controller so that the indicator marks on each are pointing straight up. Adjust as necessary to accommodate the controls provided by your receiver/processor. Note: The control settings offered by most receiver/processors are somewhat generic, so we recommend method A above since it allows you to customize the subwoofer settings to your particular system. The front panel FLAT / VIDEO CONTOUR SWITCH and KNOB allow you to optimize the subwoofers perfor- mance for music listening or movie viewing. When listening to music, many listeners prefer a flat bass response that does not emphasize any individual frequencies. Flat bass response more realistically reproduces the sound of live instruments. However, when watching movies in a home theater system, many listeners prefer a punchier, “boomier” sound that emphasizes sounds like explosions and gunfire. Subwoofers with more output in the mid-bass regions tend to deliver this punch, at the expense of flat response. The Flat / Video Contour switch allows you the best of both worlds. In the “Flat” mode, the subwoofer's response is flat for accurate musical reproduction. In the “Video Contour” mode, the SubTwo i has boosted out- put between 40Hz and the low pass frequency, and rolls off response below 35Hz to provide greater power han- dling at elevated listening levels. The Flat / Video Contour switch determines the operating mode of the SubTwo i, while the Video Contour Knob provides continuously variable adjustment of the bass boost in Video Contour mode. If your main speakers are large with generous bass response and you are connecting them full-range, you will most likely be using the SubTwo i only for very low bass reinforcement (usually below about 40Hz). In this case, the “Video” mode will not yield an increase in bass output at these frequencies, but will actually decrease its output, so the “Flat” mode may work better. The continuously variable LOW PASS FILTER determines the range of frequencies that the subwoofer will reproduce. For example, a low pass setting of 100Hz means that the subwoofer reproduces only frequencies below 100Hz. The Low Pass Filter is variable between 40Hz (low bass) to 180Hz (upper bass), to accommo- date a variety of speaker configurations. The LFE Filter Bypass Switch allows you to bypass the circuit entirely when connecting the SubTwo i to a receiver / preamplifier that features a “subwoofer (LFE) out” already containing low-pass filtering. If you are using Connection Method #1, your main speakers are reproducing only the frequency range select- ed by the High Pass Filter (see next section). As a starting point, set the Low Pass Filter at about the same fre- quency you have set the High Pass Filter. For example, if the High Pass Filter sends only signals above 75Hz to your main speakers, begin with the Low Pass Filter set at 75Hz. See the “Fine Tuning” section for further adjustment guidelines. If you are using Connection Method #2 or #4, your main speakers are reproducing the entire frequency range (including bass) and it is advantageous for the subwoofer to reproduce only those frequencies below response of 60Hz, begin with the Low-Pass Filter set at 60Hz. See the “Fine Tuning” section for further adjust- ment guidelines. If you are using Connection Method #3, your main speakers are reproducing only frequencies above 100Hz, due to the fixed 100Hz high pass filter at the speaker-level output barrier strip. As a starting point, set the Low Pass Filter at 100Hz. See the “Fine Tuning” section for further adjustment guidelines. The continuously variable HIGH PASS FILTER determines the range of frequencies that the main speakers (“satellites”) will reproduce. For example, a high pass setting of 80Hz means that the main speakers receive a signal containing only frequencies above 80Hz. The High Pass Filter is variable between 40Hz (low bass) to 120Hz (upper bass), to accommodate a variety of speaker types. The benefit of high pass filtering is improved dynamic range and lower distortion in the main speakers, as they are spared the task of low frequency repro- duction. The High Pass Filter should initially be set to a frequency above the rated low frequency limit of the main speak- ers. For example, if your speakers have a rated low frequency response of 40Hz, use the 50Hz high-pass set- ting. If your speakers have a rated low frequency response of 90Hz, use the 110Hz high-pass setting. To select the appropriate high pass setting for your main speakers, check the owner's manual for their rated low frequency response. If you are unable to obtain this information, here are some common high-pass settings: Small speaker Medium speaker Large speaker | 110Hz 75Hz 50Hz | The continuously variable SUBWOOFER PHASE switch and knob set the phase of the subwoofer anywhere between the 0° position (normal phase) and the 360° position. The ability to adjust subwoofer phase is a great advantage for achieving smooth bass response in your system. The combined low frequency sound waves from the subwoofer and the main speakers can sometimes cause peaks and dips in the frequency response at the lis- tening position. In these cases, adjusting the subwoofer phase may improve the blending and overall perfor- mance of the system. The optimal phase setting will differ according to room conditions and placement, and the main speakers used. Experiment with phase settings by listening to a familiar CD from the listening seat, alternating phase settings on the same track. Do not attempt to evaluate the best sound while standing above the subwoofer or amplifi- er, as the sound at the listening position will be significantly different. Begin by setting the phase knob at 0°, alternating the switch position between 0° and 180°. From the listening position, choose the switch position that yields the most output and leave the switch there. Then use the knob to further dial in the setting that provides the most output at the seating position. The Subwoofer Gain switch allows you to change the line-level input sensitivity of the SubTwo i by 10dB. This is useful if your receiver or preamplifier has very high line-level output voltage that limits your range of volume adjustment on the SubTwo i Controller. Setting the switch to the "0" position will give you a wider range of adjustment for the SubTwo i. The Sub Two i has a STANDBY MODE feature that is automatic and requires no user adjustment. When no signal is present for 45 minutes, the SubTwo i¡ goes into Standby Mode, and it will use a minimum of power to remain “asleep.” When the system is used again, it immediately turns on as soon as a signal is received. There is no need to turn the SubTwo i on and off every time it is used. Connect the SubTwo i Controller between a receiver's “Pre-Out” and “Main-In”, with high-pass filter loop Use if: You wish to send your L & R speakers a high-pass filtered signal and/or LFE signal You have a receiver with “Pre-Out” and “Main-In” jacks You have a separate preamplifier and main amplifier This method allows your main speakers to receive a high-pass filtered signal (not full range), and the subwoofer to be utilized for low- to mid-bass reproduction. The full-range line-level signal coming from the receiver's “Pre-Out’ passes through the SubTwo i Controller's selectable high-pass filter, which removes the low frequencies from the signal before sending it back to the receiver's “Main-In.” This configuration effectively increases the receiver and speakers’ dynamic range and power output by sparing them the difficult task of repro- ducing low frequency information. 1) Your L & R speakers are connected directly from your amplifier / receiver. 2a) If you have a receiver with “Pre-Out” and “Main-In" jacks, patch in the SubTwo i Controller between these. With an RCA intercon- nect cable, connect the receiver's “Pre-Out” to the SubTwo i Controller's LINE IN. Connect a second RCA interconnect cable from the SubTwo i Controller's SATELLITE LINE OUT back to the receiver's “Main-In.” 2b) If you have a separate preamplifier and main amplifier, connect the preamplifier output to the SubTwo i Controller's LINE IN. Connect a second interconnect cable from the SubTwo i Controller's SATELLITE LINE OUT to the main amplifier’s line-level inputs. With this configuration, your preamplifier is not connected directly to your amplifier; instead the signal passes through the SubTwo i Controller before it reaches the amplifier. 3) Connect the SubTwo i Controller's SUBWOOFER OUTPUT to the SubTwo i input terminal with the supplied RCA cable. 4) See page 6 for instruction on using the LFE Input and LFE Gain control Receiver Main Speakers Main-In o В E \ A В Output Input : To Satellites From Amplifier q L > = L (> C > ) y > | L7 To LL1 Power In Stereo Mono Gain р | | HI -9 JES. Y Ea E Г" — a?) V >) Rg) | To LFE in ! Theu 15у/ас Satellites | 500mA ый Subwoofer Chen Line Out SubTwo i Controller (rear FROM SubTwo | CONTROLLER ко Supplied RCA Cable SubTwo i Connection Method #1 “SubTwo | Amplifier TED (Back of subwoofer) + Connect the SubTwo ¡ Controller from a receiver / preamplifier's “Subwoofer (LFE) Out,” “Pre-Out” or “Line Out” with no high-pass filtering Use if: You wish to run your L & R speakers full-range You have a receiver with “Subwoofer (LFE) Out” jacks You have a receiver with “Pre-Out” jacks but no “Main-In” jacks This method of connection allows your main speakers to receive the full-range audio signal (no high-pass filtering), and the subwoofer to be utilized for low bass extension only. 1) Your L & R speakers are connected directly from your amplifier / receiver. 2a) If you have a receiver with “Pre-Out” (or “Line Out”) jacks but no “Main-In,” you may connect the SubTwo i Controller from the “Pre- Out” without having to route the signal back into the receiver. Using an RCA interconnect cable, connect the “Pre-Out” to the SubTwo i Controller's LINE IN. 2b) If you have a separate preamplifier and amplifier, and the preamplifier has two pairs of “Line Out” jacks, connect one pair directly to your main amplifier, and the second pair to the SubTwo i Controller's LINE IN. If your preamplifier has only one pair of “Line Out” jacks, you may utilize two “Y”-splitters to send the line-level signal into both the main amplifier and the SubTwo i Controller. 3a) Many integrated amplifiers and receivers/processors feature a "Subwoofer Out" or "LFE Out" jack. If your receiver's Subwoofer Out consists of an RCA jack, you may plug it into the LFE Input Jack on the SubTwo | controller. See page 6 for information on the use of the LFE Input and LFE Gain controls. 3b) Check your receiver's owner's manual to see if the “Subwoofer Out” signal is full-range or low-pass filtered. On many Dolby Digital 5.1-channel receivers, the low-pass is built-in at a certain frequency (80Hz, for example), which means the signal coming out this jack has already passed through an internal filter in the receiver. If possible, bypass the low-pass filter in the receiver. Otherwise, be sure to set the LFE Filter switch to "Bypass" to avoid having two low-pass filters affect the signal. 4) Connect the SubTwo i Controller SUBWOOFER OUTPUT to the SubTwo i input terminal with the supplied RCA cable. Receiver Main Speakers LFE Qut Pre-Out Main-In Output Input To Satellites From Amplifier eL e UU ED Be. a ae To LL1 N e e Е" a. 3 UL To LFE In] Thru pe НИНА soomA | Subwoofer Line Out SubTwo i Controller (rear FROM SubTwo | CONTROLLER > Supplied RCA Cable SubTwo i Connection Method #2 ' Sub Two i Amplifier (Back of subwoofer) SubTwo i Connection Method #3 Connect the SubTwo i Controller at speaker level from the receiver's speaker outputs, with fixed high-pass filter Use if: You wish to send your L & R speakers a high-pass filtered signal Your receiver has no “Pre-Out”, “Line Out” or “Subwoofer Out” jacks This method of connection is recommended if you have a receiver with no line level preamplifier output of any sort and you want your L & R speakers to receive a high-pass filtered signal. The SubTwo i Controller may be connected to the system at speaker level between the receiver and the speakers. The SubTwo i Controller's speaker-level output has a fixed 100Hz high-pass filter that removes fre- quencies below 100Hz before sending the signal on to the speakers. The speaker-level high-pass filter is not adjustable. This method is not recommended if the L & R speakers are large, full range models. 1) Connect a pair of speaker cables from your receiver’s front L & R speaker output terminals to the SubTwo i Controller's INPUT FROM AMPLIFIER barrier strip. 2) Connect a second pair of speaker cables from the SubTwo i Controller's OUTPUT TO SATELLITES barrier strip to the frontL&R speakers. 3) If your receiver is equipped with a "Subwoofer Out" or "LFE Out" jack, you may connect from this jack to the LFE Input on the Controller with an RCA cable. See page 6 for information on the LFE Input and the LFE Gain control. 4) Connect the SubTwo i Controller's SUBWOOFER OUTPUT to the SubTwo i input terminal with the supplied RCA cable. SubTwo i Controller (rear) Р Input WE) SC LU О: ©- О: To LL1 2 Dé e | o. e e Jo LFE in / Thru Subwoofer Satellites Line In Line Out | = rl al FROM SubTwo | CONTROLLER > Мат ~ SubTwo | | SubTwo i Am lifier : Speakers (Back of es Connection Method #3 Supplied RCA Cable 11 AA ZZ... Connect the SubTwo i Controller at speaker level from the receiver's speaker outputs, with no high-pass filter Use if. You wish to send your L & R speakers a full range signal Your receiver has no “Pre-Out”, “Line Out” or “Subwoofer Out” jacks Your receiver has two sets of speaker output terminals: “Speaker A” and “Speaker B” This method of connection is recommended when you have a receiver with no line level preamplifier output of any sort and you want to run your speakers full range (no high-pass filtering). If your receiver features two sets of speaker output terminals (“Speaker A” and “Speaker B”), you may use “Speaker B” to connect the SubTwo i Controller. en ip 1) Connect a pair of speaker cables from your receiver's “Speaker A” outputs directly to your main speakers. 2) Connect a second pair of speaker cables from your receiver's “Speaker B” outputs to the SubTwo i Controller's INPUT FROM AMPLI- i FIER barrier strip. 3) If your receiver is not equipped with “Speaker A” and “Speaker B” output terminals, you may connect both the L & R speakers and the SubTwo i Controller in parallel from the same terminal. Connect one pair of speaker cables from the receiver's speaker output ter- minal to the L & R speakers. Connect a second pair of speaker cables from the receiver's same output terminal to the SubTwo i Controller's INPUT FROM AMPLIFIER barrier strip. The SubTwo ¡ Controller's barrier strip input does not present a significant load to the receiver and will not compromise its output to the L & R speakers. 4) If your receiver is equipped with a "Subwoofer Out" or "LFE Out" jack, you may connect from this jack to the LFE Input on the Controller with an RCA cable. See page 6 for information on the LFE Input and the LFE Gain control. 5) Connect the SubTwo i Controller's SUBWOOFER OUTPUT to the SubTwo i input terminal with the supplied RCA cable. Receiver Main Speakers SubTwo i Controller (rear) Output 0:0 | As 4 A 4 To LL1 Power In AA = an т ~ “u | - De = A o ! D) R e E ‘ sc % af x — or y LFE In / Thru AA Satellites Subwoofer Line Out FROM SubTwo | CONTROLLER - Supplied RCA Cable Sub Two i Connection Method #4 с : pe CORDED re | Amplifier cm 12 (Back of subwoofer) =” В NIN в 05005) Lie NAS ET SE oi The frequency chart below lists some terms commonly used to describe different bands of the frequency spec- trum. The key to good subwoofer / speaker integration is repeated listening, followed by small re-adjustments of the subwoofer controls. The most important bass tuning functions you will control are the LOW PASS FILTER, followed by the VOLUME CONTROL settings and then PHASE SELECTOR. Frequency Chart ¡Low Bass Mid Bass Upper Bass| |Lower Mid Mid Upper Mid| | High 4 CEE STE us ELE — rate 3K and above Listen to your system and make adjustments to achieve a seamless blend between your main speakers and the SubTwo i. Four common problems are outlined below. Follow the flow chart to correct these. See the glos- sary for any terms you are unfamiliar with. Below 50Hz . 50Hz-100HZ 100Hz-180Hz 180Hz-300Hz 300Hz-700Hz 700Hz-3K Fine Tuning Flow Chart | == US e Lacks mid / upper mid / upper Lacks low AA bass: low bass bass: В ` eh bass weight Problem “Boomy” lean but with weight weight == Lower low- Adjust sub- Increase sub- Decrease Solution | pass crossover | | woofer phase woofer subwoofer frequency volume and volume and == $ lower low- raise low-pass ¥ pass setting setting If this makes the Lower sub- problem worse, Raise low-pass woofer volume try. > setting If the sound MEE e improves y Move sub- Woofer woofer farther f Adjust sub- Adjust sub- closer to wall ET SAME woofer phase woofer volume wall Adjust sub- y Ÿ Y Y woofer volume } Adjust sub- Adjust sub- Adjust sub- | Listen | woofer phase woofer phase | | woofer phase | Listen | y y y | Listen | [Listen |[ Listen | —— a ——— —— Ma —— au GE 2 When the SubTwo i is turned on, there will be an audible “pop.” Do not be alarmed! This is inherent to the amplifier design and will not damage the subwoofer or your audio system. We do recommend, however, that the Sub Two's power is left “on” at all times, allowing its built-in Standby Mode feature to disable the subwoofer when not in use. The Sub Two i was designed to handle a wide range of listening levels, but every component has limits. It is important to use common sense and listen for signs of possible distress from the subwoofer. Noticeable dis- tortion or harsh breakup is an indication that the subwoofer is running beyond its capacity, and the volume should be decreased. If you feel heat emanating from the front of the woofer, reduce the level immediately. Speaker damage most often occurs from sustained high volume levels, not from transient sounds or brief musi- cal peaks. Excessive boosting of bass, treble, or equalizer controls can worsen the problem and is not recom- mended. ® Maintenance Your SubTwo i has been designed for years of trouble-free operation and requires minimal maintenance under normal use. The SubTwo i cabinet may be cleaned using a damp cloth or a mild, non-abrasive glass cleaner. to clean the grille, first remove it from the subwoofer, then brush lightly with a soft brush or use a vacuum on its lowest setting. The SubTwo i Controller may be cleaned by wiping with a lint-free cloth. Do not expose the SubTwo i or the Controller to direct sunlight, high temperatures or moisture. In the event that service is required, do not open the SubTwo i amplifier or Controller. Refer the unit to a qualified service technician. ® Troubleshooting If the SubTwo i fails to operate when the Power switch is turned on, check the power cord and all input AN and output connections thoroughly. Failure to operate could be caused by incorrect wiring, short circuits, or excessive volume. Turn the Power switch on the subwoofer to "off" for two or more seconds to reset. If the LED indicator fails to illuminate, it is possible that mis-wiring or an electrical power surge has caused the pro- tection fuse to blow. It must be replace with one of correct type and value. Contact your local Authorized NHT dealer or NHT immediately for assistance. т DIOSSdIy YI ISI HS Active: Uses electrical power. Amplifier: An electronic device that increases the current of a signal, providing power to the loudspeakers (i.e. power amplifier, inte- grated amplifier, receiver). Barrier Strip: A row of speaker connectors with screw-activated locking mechanisms. Bass: The range of audio frequencies below 160Hz, characterized by low pitch. Crossover: An electronic circuit that divides an audio signal into different frequency ranges. Distortion: Any deviation from the original signal, caused by any type of equipment. Driver: The moving part of a loudspeaker which radiates energy. Dynamics: Variations in loudness of sound. Frequency: A rate of vibration which corresponds to musical pitch in the audio band, expressed in Hertz (Hz). Full Range: A signal encompassing the entire frequency spectrum, not filtered above or below a certain frequency. Hertz (Hz): A unit of frequency equal to one cycle per second, used to measure the frequency of a signal or sound. High-Pass Filter: A filter that passes only frequencies above a certain lower limit; electronically removes low frequencies from a full range signal. Impedance: A measure of the total opposition to current flow in an alternating current circuit, described in ohms. In Phase: The polarity of an audio signal when connected as follows: (+) to (+) and (-) to (-). Integrated Amplifier: Has preamplifier and amplifier built into one chassis. Interconnect Cable: A length of shielded wire with plugs at both ends for feeding signals from one electronic device to another. L.F.E.: “Low Frequency Effects”; an RCA output for connection to a subwoofer. Line-Level Connection: Low level RCA/phono type connection. Load: A term used to describe the impedance which a speaker presents to an amplifier. Low-Pass Filter: A filter that passes only frequencies below a certain upper limit; electronically removes high frequencies from a full range signal. Main Speakers: Front L & R channel speakers, sometimes referred to as satellites. Main-In: A line-level RCA input on the back of a receiver, integrated amplifier or power amplifier. Midrange: The frequency span of the middle of the audio range, roughly 160Hz - 1300Hz. Also used to describe the driver which reproduces these frequencies. Ohm: A unit of electrical resistance; that which opposes an electric current in a conductor. In audio, a measure of the load presented by a device to an electrical source. Out-of-Phase: The polarity of an audio signal when connected as follows: (+) to (-) and (-) to (+). Passive: Uses no electrical power. Phase: An expression of the relative polarities of two identical signals. Power Handling: The ability of a loudspeaker to operate without distortion when given varying amounts of wattage. Preamplifier: An electronic device that selects sources and passes line-level signal to amplifier. Pre-Out: A line-level RCA output on the back of a receiver, integrated amplifier or preamplifier. Receiver: Has preamplifier, amplifier and tuner built into one chassis. Satellite: Front L & R speakers when used with a subwoofer. Referred to as “main speakers”. Sensitivity: A ratio of how much of the input electrical power is converted into acoustic power, measured in decibels. Signal: The series of continually changing electrical voltages that correspond to variations in the loudness of the original sound. Speaker-Level Connection: The connection between a loudspeaker and an amplifier. Sub Out: An RCA output for connection to a subwoofer. Subwoofer: A driver designed to operate over the low bass portion of the audio range. Also refers to a system consisting of a woofer and its enclosure which are physically separate from the upper range loudspeakers. Surround Speakers: Speakers located in the side or rear for surround channel effects. Treble: The upper part of the frequency spectrum, consisting of frequencies above about 1300Hz. Tweeter: A small driver designed to reproduce high frequencies. Watt: A measure of electrical power, combining the voltage with the electrical current required to drive the loudspeaker. Weight: Low frequencies below 50Hz. Woofer: A driver designed to operate over the bass portion of the audio range. MA A Limited Warranty v 00 Valid Only in the U.S.A. Warranty Period For a period of 5 years for parts and 5 years for labor (1 year parts and 90 days labor for electronics) from the date this product is first purchased from an authorized NHT dealer, Now Hear This (NHT) warrants that if it fails to function proper- ly due to a manufacturing defect, despite its being installed and operated according to these instructions and used under + normal conditions, it will be either replaced or repaired with new or rebuilt parts (both at NHT's option) with a unit of com- parable value without charge to you. What's Not Covered Altered, defaced or removed serial numbers void this warranty. This warranty does not cover any product used in trade, business, industrial or commercial applications. This warranty also does not cover the cabinet or appearance factors, or costs, defects or damage resulting from misuse, abuse, accident, improper maintenance, alterations or modifications not authorized in writing by NHT, or parts or labor from any source other than an authorized NHT service location. Damage due to power exposure in excess of the speaker's published power ratings; ie, overpowering, lightning or power surges, are also not covered. Your Rights This warranty gives you specific legal rights, and you may have other rights which vary from state to state. NHT limits this warranty to the purchase price of the product, excludes incidental or consequential damages, and limits its obligations under any implied warranties under state laws to a period not exceeding their warranty periods. As some states do not allow the above limitations, however, they may not apply to you. To Obtain Service NHT has appointed a number of authorized service companies throughout the USA who can provide warranty service upon your presenting your sales receipt showing place and date of original owner's transaction. To find the name and address of the nearest authorized NHT service location, call or write: AB Tech Services, 17C Airport Drive, Hopedale, MA 01747. 1-800-225-9847 [email protected] For your future convenience, please keep this warranty with your sales receipt, and record date and place of purchase for further reference. CESS ">
Advertisement
