NHT SubOne i User's Manual
Contents
1. le kgad Prom Aspira PADNA i z l To LL1 Bae cede 1 iivec anf SubOne i Controller rear SubOne i Connection Method 2 SubOne i Amplifier Back of subwoofer SubOne i Connection Method 3 Connect the SubOne i Controller at speaker level from the receiver s speaker outputs with fixed high pass filter Use if You wish to send your L amp 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 amp R speakers to receive a high pass filtered signal The SubOne i Controller may be connected to the system at speaker level between the receiver and the speakers The SubOne 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 amp R speakers are large full range models 1 Connect a pair of speaker cables from your receiver s front L amp R speaker output terminals to the SubOne i Controller s INPUT FROM AMPLIFIER barrier strip 2 Connect a second pair of speaker cables from the SubOne i Controller s OUTPUT TO SATELLITES barrier strip to the front L amp R speakers 3 If your receiver is eq2. U ser s Manual voe Subone i Powered Subwoofer IMPORTANT SAFETY INSTRUCTIONS 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 base ment ne
3. 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 SubOne 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 amp 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 SubOne i Controller between these With an RCA intercon nect cable connect the receiver s Pre Out to the SubOne i Controller s LINE IN Connect a second RCA interconnect cable from the SubOne 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 SubOne i Controllers LINE IN Connect a second interconnect cable from the SubOne i Controllers 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 SubOn
4. 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 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 sub woofer 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 ade quate space for proper ventilation Do not place the subwoofer directly against the wall or any other s
5. 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 op
6. 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 power 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 amp 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
7. 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 mis use 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 info abtechservices com For your future convenience please keep t
8. E Input and LFE Gain Control section for more information Detailed descriptions and diagrams of all four connection methods are found on pages 8 11 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 SubOne i Controller to its lowest position counter clockwise Turn on your audio system including the SubOne 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 SubOne 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 you receiver processor has a subwoofer out or LFE out jack you can connect that jack to the LFE Input on the back of the SubOne i Controller You ca
9. 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 1300HZz 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 14 Limited Warranty 00 Valid Only in the U S A 009 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 prop erly 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 comparable value without charge to you What s Not Covered Altered defaced or removed serial numbers void this
10. ar 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 ampli fiers 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
11. ble between 50Hz low bass to 200Hz upper bass to accommo date a variety of speaker configurations If you are using Connection Method 1 your main speakers are reproducing only the frequency range selected by the High Pass Filter see next section As a starting point set the Low Pass Filter at GHD about the same frequency 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 the rated response of the main speakers For example if your main speakers have a rated low frequency response of 60Hz begin with the Low Pass Filter set at 60Hz See the Fine Tuning section for further adjustment guide lines 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 selectable HIGH PASS FILTER determines the range of frequencies that the main speakers satellites will reproduce For example a high pa
12. cables from your receiver s Speaker B outputs to the SubOne i Controller s INPUT FROM AMPLI FIER barrier strip 3 If your receiver is not equipped with Speaker A and Speaker B output terminals you may connect both the L amp R speakers and the SubOne 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 amp R speakers Connect a second pair of speaker cables from the receiver s same output terminal to the SubOne i Controller s INPUT FROM AMPLIFIER barrier strip The SubOne i Controller s barrier strip input does not present a significant load to the receiver and will not compromise its output to the L amp 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 eera ranean mern H aman HHEH FL c aesecee A camer VW Dpat ia Sod ioe Input Prem Ampar det Sale ale DAAR PEPA a fee lan i i 0 oc r F wer LPE r Te Pitas 90 Supplied RCA Cable SubOne i Connection Method 4 SubOne i Amplifier Back of subwoofcr Fine Tuning the Subwoofer The frequency chart below lists some te
13. ceives 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 pos sible connection methods outlined in this manual The best method for you depends on the size of your front L amp 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
14. e i Controller before it reaches the amplifier 3 Connect the SubOne i Controllers SUBWOOFER OUTPUT to the SubOne 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 Canpat te Sve ites inpar Prove A mpar AU S AN E A ESAEREN i La s i pe twi s bh h ee ee ee ee ee ee ee oe T ree 3 Birde L ie bine s9 SubOne i Controller rear Supplied RCA Cabir SubOne i Connection Method 1 SubOne i Amplifier Back of subwoofer SubOne i Connection Method 2 Connect the SubOne i 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 amp 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 amp 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 SubOne i Controller from the Pre Out without having to route the signal back into the receiver Using an RCA interconnect cable connect
15. e subwoofer Because the L amp 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 the 75Hz or 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 amp R speakers and may limit their output at higher volumes What connection options are available in my system 1 If you have a separate preamplifier and main amplifier all four of the connection methods are available 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 LF
16. erate 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 deter mine that the product is in proper operating condition CAUTION TO PREVENT ELECTRIC SHOCK DO NOT USE THIS POLARIZED PLUG WITH AN EXTENSION CORD RECEP TACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE LEL me m re ai alt Specifications Diagrams of SubOne i Subwoofer and Controller Placement Four Connection Methods Which connection options are available in my system Explanation of Features SubOne i Connection Method 1 o o a a A A O PND SubOne i Connection Method 2 SubOne i Connection Method 3 SubOne i Connection Method 4 _ gt ah mo Fine Tuni
17. 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 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 In See next section you can use the subwoofer only to provide low bass reinforcement Connection CHD Methods 2 and 4 The downside is that sending the speakers a full range signal can make it difficult to inte grate 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 reciever 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 th
18. his warranty with your sales receipt and record date and place of purchase for further reference
19. imal 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 The SUBWOOFER GAIN switch allows you to attenuate the line level input sensitivity of the SubOne i by 10dB This is useful if your receiver or preamplifier has very high line level output voltage that limits your range of vol ume adjustability on the SubOne i Controller Engaging the 0dB attenuation will give you a wider range of vol ume adjustment for the SubOne i The SubOne i has a STANDBY MODE feature that is automatic and requires no user adjustment When no signal is present for 45 minutes the SubOne 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 SubOne i on and off every time it is used SubOne i Connection Method 1 Connect the SubOne i Controller between a receiver s Pre Out and Main In with high pass filter loop Use if You wish to send your L amp R speakers a high pass filtered signal and or LFE signal You have a receiver with Pre Out and Main In jacks You have
20. ing 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 instru ments However when watching movies in a home theater system many listeners prefer a punchier boomi er 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 SubOne i s response is flat for accurate musical reproduction In the Video Contour mode the SubOne i has boosted output between 40Hz and the low pass frequency and rolls off response below 35Hz to provide greater power han dling at elevated listening levels If your main speakers are large with generous bass response and you are connecting them full range you will most likely be using the SubOne i only for very low bass reinforcement usually below about 40Hz In this case the Video Contour 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 adjustable 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 varia
21. n 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 SubOne 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 above to insure that the SubOne i receives input from the LFE channel Setting the speaker
22. ng the Subwoofer oo Operation oo Maintenance oo Troubleshooting oo Glossary of Terms ol Warranty Information Thank you for your purchase of the NHT SubOne i Powered Subwoofer System Please take a few moments to read through this Owner 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 SubOne i packaging to protect the system in the event that you move or transport it SubOne i Specifications System type Vented subwoofer with built in amplifier and outboard controller Driver complement 12 long throw polypropylene woofer Power output 250 watts mono into 6 ohms under license from Sunfire Corporation Frequency response 25Hz 180Hz 3dB Distortion Less than 0 3 at full power Crossover Low pass continuously variable between 40 180Hz 18dB octave Selectable high pass at 50 75 and 110Hz 12dB octave line level Fixed high pass at 100Hz 8 ohms 6dB octave high level Controller input connectors Gold plated RCA jacks for line level and LFE input Gold pla
23. r volume Adjust sub Adjust sub Adjust sub y woofer phase woofer phase woofer phase f f Operation When the SubOne 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 SubOne i s power is left on at all times allowing its built in Standby Mode feature to disable the subwoofer when not in use The SubOne 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 SubOne i has been designed for years of trouble free operation and requires minimal maintenance under normal use The SubOne 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 it
24. rms 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 Lower Mid Mid Upper Mid L Mid Bass Upper Bass ow Bass et Pe EN paaa e Below 50Hz 50Hz 100Hz 100Hz 180Hz 180Hz 300Hz 300Hz 700Hz 700Hz 3K 3K and above Listen to your system and make adjustments to achieve a seamless blend between your main speakers and the SubOne 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 Fine Tuning Flow Chart Too much mid upper bass Boomy Excessive low bass weight Lacks mid upper bass lean but with weight Lacks low bass weight Problem Adjust sub woofer phase Lower low pass crossover woofer frequency volume and lower low f pass setting If this makes the Decrease subwoofer volume and raise low pass setting a Solution Increase sub Raise low pass setting If the sound improves Move sub woofer Lower sub problem worse woofer volume try Move sub woofer closer to wall Adjust sub woofer volume farther from wall Adjust sub y woofer phase Adjust sub woofe
25. s lowest setting The SubOne i Controller may be cleaned by wiping with a lint free cloth Do not expose the SubOne i or the Controller to direct sunlight high temperatures or moisture In the event that service is required do not open the SubOne i amplifier or Controller Refer the unit to a qualified service technician Troubleshooting 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 protection 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 If the SubOne i fails to operate when the Power switch is turned on check the power cord and all input Glossary of Terms 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 type 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 an
26. s to small means that they are rolled off below 80Hz limiting the amount of bass information they must reproduce and they receive no infor mation from the low frequency effects channel Setting the main speakers to small is not necessary when they are properly integrated with the SubOne i since the subwoofer and main speakers together form a full range system b Run an interconnect from the LFE output on your receiver processor to the LFE Input on the SubOne 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 Low Pass filter on the Controller to its highest setting 180Hz so that it doesn t interfere with the receiver processor setting 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 allows you to optimize the SubOne i s performance for music listening or movie viewing When listen
27. ss setting of 50Hz means that the main speakers receive a signal con taining only frequencies above 50Hz 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 reproduction There are three available high pass settings 50Hz 75Hz and 110Hz 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 SUBWOOFER PHASE selector sets the phase of the subwoofer at the 0 position normal phase and the 180 position reverse phase 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 listening position In these cases adjusting the subwoofer phase may improve the blending and overall performance of the system The opt
28. t 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 a Flat Video Contour switch that maintains flat response for music listening and adds extra midbass output for video playback The SubOne i subwoofer and Controller are connected via the supplied 20 RCA cable 2 d SubOne i Powered Subwoofer Subwoofer Back System Controller Front Controller Back 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 4 ESAn f seee mtes o 11 Subwoofer Phase Selector 2 position selectable phase control for subwoofer 12 Low Pass Filter Continuously variable low pass
29. ted barrier strip for speaker level input Controller output connectors Gold plated RCA jacks for line level high pass output Gold plated barrier strip for speaker level high pass output Gold plated RCA jack for subwoofer output Subwoofer input connectors Gold plated RCA jack from controller Phase Control 2 position selectable at 0 and 180 degrees Standby Mode defeatable Automatic when no signal is present for 45 minutes Weight Subwoofer 47 Ibs Controller 3 Ibs Dimensions Subwoofer 16 H x 16 W x 16 D Controller 2 H x 11 W x 7 D Finish Subwoofer high gloss black piano lacquer finish Controller matte black anodized front panel black powder coated chassis 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 SubOne i Powered Subwoofer System is a compact versatile and powerful subwoofer designed to provide low frequency reinforcement for high performance audio and home theater systems The system is powered by a built in 250 watt amplifier using patented Sunfire technology that allows it to deliver extraordi narily dynamic high current output The SubOne i features an outboard Controller that allows convenient adjustmen
30. the Pre Out to the SubOne 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 SubOne 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 SubOne i Controller 3a Many integrated amplifiers and receivers feature a Subwoofer Out or LFE Out jack If your receiver s Subwoofer Out consists of a single RCA jack you should plug it into the LFE IN jack on the SubOne i Controller 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 SubOne i low pass filter at its highest point 180Hz to avoid having two low pass filters affect the signal 4 Connect the SubOne i Controller SUBWOOFER OUTPUT to the SubOne i input terminal with the supplied RCA cable 5 See page 6 for instruction on using the LFE Input and LFE Gain control Receiver Main Speakers rear rere OL ee
31. uipped 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 SubOne i Controller rear To LLA Powerin Tn 899 09 Receiver dl l ui SPORE OUTFIT SubOne i Connection Method 3 PSH bkra mnra Main Speakers SubOne i Amplifier Back of subwoofer Subbed RCA Gable SubOne i Connection Method 4 Connect the SubOne i Controller at speaker level from the receiver s speaker outputs with no high pass filter Use if You wish to send your L amp 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 SubOne i Controller 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
32. ur face 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 con nections 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 re
33. y 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 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 amp R channel speakers sometimes referred
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