NHT S-20 User's Manual
Contents
1. Powered Subwoofer Owner s Manual NHT Inc 6400 Goodyear Road Benicia CA 94510 www nhthifi com IMPORTANT SAFETY INSTRUCTIONS AN aa ee OF ELECTRIC SHOCK aa ee 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 WATER AND MOISTURE The appliance should not be used near water near bathtub washbowl kitchen sink laundry tub in a wet base ment near a2. D 17 5 x 12 2 x 15 Finish Matte Black 17 5 yin los Per the EC directive of WEEE Waste Electrical and Electronic re ge Equipment this product may not be disposed of as waste It must be recycled through an approved recycling method This recycling serv 49 90 ice shall be provided at no cost to the consumer by the distributor or retail outlet where the product was originally purchased For recy cling the consumer should contact the place of original purchase for a eee more information 16 with grille and rear panel controls Allow additional room for wire dress Limited Warranty 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 properly due to a manufacturing defect despite its being installed and operated according to these instruc tions 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 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 fact
3. S 20 cabinet is finished with a durable powder coat paint Light dusting is usually sufficient although the cabinet can be cleaned with a non abrasive water based cleaner WARNING To avoid risk of electrical shock do not remove the amplifier from the rear of the cabinet Refer all repairs to a qualified authorized service cen ter Always disconnect the S 20 from the AC power source prior to any maintenance TROUBLESHOOTING If the S 20 fails to operate when the Power Switch is turned on thoroughly check the power cord input and output connections If the S 20 turns on but the LED indicator fails to illumi nate mis wiring or a power surge may have caused the amplifier to become damaged If the S 20 turns on but its status LED appears AMBER the unit has gone into FAULT protect mode which could be caused by incorrect wiring short circuits or excessive volume Turn off the Power Switch on the sub woofer for two or more seconds to reset If this doesn t help contact NHT customer service TECHNICAL SUPPORT Specifications Toll free 800 NHT 9993 648 9993 Fax 1 707 747 1252 www nhthifi com System Type __ Bass Reflex or Sealed Powered Postal Mail NHTPro 6400 Goodyear Road Benicia Driver 40 Aluminum Cone CA 94510 Not Video Shielded Response 32Hz 110Hz 3dB Amplifier Power 200 watts Class D Amplifier 77 Weight 35 lbs Dimensions H x W x
4. Use the 4dB position when you have a normal or high signal level most cases Use the 10dB position when you have a very low signal level rarely When setting up the system start with the control in the 4dB position If the system output is adequate when your signal source has it s volume or gain control at the maximum position leave the control in that position If the system does not have enough output move the control to the 10dB position Following this procedure will give you the minimum sys tem noise level 3 High Pass HP Frequency Switch The High Pass Frequency switch determines the lowest frequency passed on to the satellite monitors There are two settings 80Hz and 110Hz Selecting the proper switch position see the Initial Control Settings section on Pg 4 will help blend the overall system response and 2 2009 re Sub Level Seng Fedi PIRE Freq 4B 110Hz o OO 10dB 80Hz 18 dp 0 80 Hz 110 D professional S 20 subwoofer AN WS Q O ren Right Power Standby Fault Green O ed Ami aes TRS Sub Bypass we 100 240 VAC 50 60Hz A S 45W FE A pan WARNING ToREDUCE THE man or PRE OR ELECTRIC W ce re mi increase power handling Setting the Subwoofer Bypass switch to BYPASS eliminates this circuit and sends all frequencies in the signal to the satellite monitors 4 Phase Swi
5. options have been provided for your convenience Use only one connection for the left channel and only one con nection for the right channel or damage may result to your subwoofer 7 Output Section The output connectors to the satellite monitors are bal anced TRS type Two 12 cables are included to connect the S 20 left and right outputs to the satellite monitors PLEASE NOTE f you are using your S 20 subwoofer with a pair of NHT M 00 s set the sensitivity switch on the M 00 s to 4 8 Subwoofer Bypass This feature helpful when monitoring allows you to turn the S 20 ON or OFF on the fly Any standard latching or two position foot switch that has a 1 4 plug will control this function A press of the foot switch will place the S 20 and its High Pass filter into BYPASS mode and remove them from the signal chain A second press of the foot switch causes the S 20 to resume operation 9 Power Section The main power ON and OFF switch is located above the power cord receptacle Located above to the power switch is an LED Inticator GREEN the S 20 is operating normally AMBER the S 20 is in Standy Mode When the S 20 doesn t hear an incoming signal after a period of time it will go into standy mode and will wake up and come out of standby mode when it hears a signal RED the S 20 is in FAULT consult the Troubleshooting section of this manual pg 5 The Port Plug The S 20 subw
6. We suggest you start with this control in the 12 o clock position Move the control in a clockwise direction to increase bass output and counterclockwise to decrease it Adjust the level so that the S 20 seamlessly integrates with the satellites ie you can tell it s operating but can t hear it as a separate entity Low Pass Frequency Seiting Getting this setting right may take a little time Using a variety of demo material you are very familiar with start with the control in the 12 o clock position If the bass sounds too punchy turn the control counter clockwise towards 80Hz If the bass sounds thin turn the control clockwise towards 110Hz SUBWOOFER PLACEMENT Where you locate the S 20 subwoofer will have a pro found effect on the system s performance Unfortunately there are no hard and fast rules to find the best location If you have some flexibility we encourage you to experi ment The following guidelines should help you in your placement decisions Placement near walls and corners will reinforce low fre quencies conversely placement out into open space will add definition but will reduce bass weight and extension Ideally the subwoofer should be adjusted so that you hear the additional bass extension but cannot localize the subwoofer itself The subwoofer should be placed somewhere in the same plane as the left and right moni tors Listen as you go using a wide variety of program material Jazz reco
7. an be used to reproduce the 1 LFE channel for surround mixing The S 20 was designed to mate seamlessly with the NHT Pro M 00 and M 20 monitor systems and offers tremendous flexibility Use multiple S 20 s to improve bass output if desired Add an optional footswitch and you take the S 20 in and out of the audio chain on the fly Use as a ported or sealed design as NHT includes a port plug with every S 20 Investing some time learning about the S 20 s features and capabilities will reward you with the best possible performance Now would also be an excellent time to fill out and send in your warranty registration card or regis ter online in the Support section at www nhtpro com This action will automatically extend both the parts and labor warranty for an additional two years for a total of three years If at any time you require assistance call our customer service hotline at 800 NHT 9993 648 9993 USER CONTROLS CONNECTORS 1 Sub Level Conirol The subwoofer level control matches the S 20 output level to the satellite monitors This control differs from most as it doesn t turn the woofer all the way off but offers a 18dB range of adjustment Fully clockwise out put is maximum 0 dB or unity In the counter clockwise position the sub output is attenuated by 18dB 2 Input Sensitivity Control This control affects the level of all signals that go through the S 20 both the subwoofer and satellite signals
8. e normally or exhibits a marked change in performance or e The appliance has been dropped or the enclosure is damaged 18 SERVICING Do not attempt to service this product yourself as opening or removing covers may expose you to dangerous voltage or other hazards Refer all servicing to qualified service personnel For service warranty information call the NHT Hotline number 1 800 NHT 9993 19 REPLACEMENT PARTS When replacement parts are required be sure the service technician has used replacement parts specified by the manufacturer or that have the same characteristics as the original part Unauthorized substitution may result in fire electric shock or other hazards 20 SAFETY CHECK Upon completion of any service or repairs to this product ask the service technician to perform safety checks to determine that the product is in proper operating condition oa hazardous mains voltage and user accessible parts When servicing use only This symbol indicates that this product incorporates double insulation between identical replacement parts 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 INTRODUCTION Thank you for your purchase and congratulations on your selection of the NHT Pro S 20 powered subwoofer The S 20 will add dynamic bass response to any pair of smaller powered monitors or c
9. e outlet try reversing the plug If the plug still fails to fit contact your elec trician 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 operat
10. oofer is designed to be used as either a bass reflex or acoustic suspension subwoofer With the port plug removed the subwoofer is a bass reflex sys tem With the plug in the system is acoustic suspension In bass reflex mode the subwoofer will have lower bass extension and more output capability but somewhat less ened transient response In acoustic suspension mode the subwoofer will have less bass extension and output but better transient response In a room with a lot of low frequency standing waves or where the subwoofer must be placed in a corner acoustic suspension mode will probably sound best In a larger room or where the sub woofer is farther from the walls or corners bass reflex mode will work best When installing the port plug put it in the port until it stops and then push it in another 1 4 It is not necessary to use a lot of force As long as there is no audible air noise coming from the port the plug is in far enough CONNECTING THE S 20 SUBWOOFER Using the S 20 as a 1 or LFE stand alone device Connect either an RCA XLR or TRS from your designat ed LFE channel or buss output assignment to either the left or right input on the S 20 INPUT SECTION If more subwoofer sensitivity is required use a Y adaptor and connect to both left and right inputs Turn the low pass control to its maximum position Be sure to utilize sur round test tone signals to properly balance the woofer level with the
11. ors or costs defects or damage resulting from misuse abuse accident improper maintenance alter ations 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 To find the name and address of the nearest authorized NHT service location call or write Customer Service Department NHT 6400 Goodyear Rd Benicia CA 94510 1 800 NHT 9993 648 9993 www nhthifi com For your future convenience please keep this warranty with your sales receipt and record date and place of purchase for further reference 5
12. other monitor channels Please read through the Subwoofer Placement and User Controls sections before you begin Using the S 20 to augment the frequency response of powered mini monitors Connect the left and right outputs from your mixer or source unit to either the XLR TRS or RCA jacks on the INPUT section of the S 20 Now connect the supplied left and right TRS cables from the OUTPUT jacks on the S 20 to your satellite monitors input jacks You may also want to connect a foot switch or any standard 1 4 2 position switch into the BYPASS input on the rear of the S 20 Using this feature is not necessary to the basic operation of the S 20 INITIAL CONTROL SETTINGS Input Sensitivity Selection This switch affects the input sensitivity of all three sets XLR TRS and RCA of input jacks When satellites are connected to the S 20 the subwoofer takes over as the master sensitivity control for the system IMPORTANT Set the satellite speakers you re using to the 4 setting Set the sensitivity on the S 20 to the appropriate setting for your source equipment HP Frequency Selection If you are using NHTPro M 00 monitors as satellites set the HP FREQ to the 110Hz setting If you use a different brand of powered satellites try setting the switch to 110 Hz when the satellite woofer size is 5 or smaller and 80Hz if larger than 5 Subwoofer Level Setting The level you select will depend largely on placement
13. rdings with acoustic bass and piano are particularly helpful in determining location sub level and crossover settings Transparency and integration are the goals The S 20 subwoofer amplifier has a number of controls which can help you determine optimal placement A little time spent experimenting with these options should yield just the right solution for your installation TECH TIP The bypass foot switch is very helpful when setting up and tuning the S 20 to your room When switching the woofer in and out no tonal difference should be noticeable just bass or no bass SYSTEM OPERATION The S 20 used in conjunction with good satellite monitors like the M 00 s can play very loud with low distortion Although designed to handle a wide range of listening levels every speaker has its limits Harsh breakup is an indication your monitors or the subwoofer have exceeded their output limits Excessive boosting of bass treble or equalizer controls can worsen the problem If you hear continuous distortion or feel heat emanating from the drivers reduce the level immediate ly Most speaker damage occurs from sustained high volume levels not from transient sounds or brief musical peaks Listening at high volume levels is potentially dan gerous and can lead to permanent hearing loss especially when listening in the near field Protect your ears and use common sense SYSTEM MAINTENANCE Your S 20 subwoofer needs no regular maintenance The
14. 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 oper ating 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 out let only one way This is a safety feature If you are unable to insert the plug fully into th
15. tch This switch sets the polarity of the subwoofer at either the 0 position normal phase or the 180 position reverse phase to achieve the smoothest possible bass response in your system This phase reversing option is important because when bass frequencies come from both the subwoofer and the main speakers peaks and dips in the frequency response can occur at the listening position In these cases reversing the subwoofer polarity can improve blending and balance To properly set the Subwoofer Phase e Play familiar music reversing polarity settings Listen from your usual position e Avoid evaluating while standing above the subwoofer or amplifier sound at the listening position will be signifi cantly different e The correct setting is the one in which the bass is the loudest at the listening position 5 Low Pass LP Frequency Control This control allows fine adjustment of the subwoofer crossover point to match the point where the satellites roll off at the low end of their response This detented low pass control has a range of 80Hz 110Hz 6 Input Section The S 20 offers three stereo input options two types of balanced inputs TRS and XLR and unbalanced RCA The two balanced inputs are wired in parallel Note Standard 1 4 connectors may be used in place of the TRS type if the source equipment employs unbalanced outputs but this method may induce unwanted noise PLEASE NOTE These different connector
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