NHT Powered Subwoofers Speaker User Manual
Contents
1. Classic Ten Twelve Powered Subwoofers Owners Manual 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 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 pool2. 6 ohm nominal 6 ohm nominal 8 ohm nominal 6 ohm nominal 8 ohm nominal 8 ohm nominal Recommended Maximum 100 watts Maximum 125 watts Maximum 150 watts Maximum 250 watts Maximum 175 watts Maximum 200 watts Amplifier Power RMS Weight 8 Ibs 12 7 lbs 17 lbs 64 3 Ibs 20 Ibs 23 Ibs 41 Ibs 49 Ibs Dimensions 9 75 x 5 625 x7 25 12 125 x7x8 875 13 75 x 7 5 x 10 375 41x75 x16 6 5 x 19 875 x 7 375 7x 21 875 x 8 25 18 125 x 11 25 x 15 20 125 x 14 x 15 75 H x W x D Par White or Black White or Black Black Black Black Black Black Black Finish oe High Gloss Piano High Gloss Piano High Gloss Piano High Gloss Piano High Gloss Piano High Gloss Piano High Gloss Piano High Gloss Piano Finish Finish Finish Finish Finish Finish Finish Finish 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
3. a ground loop isolator A good one is avail able from Jensen Transformers Jensen Transformers Inc 7135 Hayvenhurst Ave Van Nuys CA 91406 Voice 818 374 5857 Fax 818 374 5856 www jensen transformers com Part VRD 1FF Retail cost of 59 95 If these steps don t restore the Ten or Twelve to operation contact your local Authorized NHT Dealer or NHT for assistance Satisfaction Your satisfaction with your new NHT Ten or Twelve Subwoofer is important to us Please note the matched products and accessories we provide for them and your warranty printed on the back of this manual If you have any questions regarding your speakers use feel free to call NHT at 1 800 NHT 9993 Enjoy your listening and viewing Glossary Active Uses electrical power Amplifier An electronic device that increases the cur rent and or voltage of a signal providing power to the loudspeakers i e power amplifier integrated amplifier receiver Bass The range of audio frequencies below 180Hz characterized by low pitch Crossover An electronic circuit that divides an audio signal into different frequency ranges Distortion Any deviation from the original signal Driver The moving part of a loudspeaker which radiates sound energy Dynamics Variations in loudness of sound Frequency A rate of vibration which corresponds to musical pitch expressed in Hertz Hz Full Range A signal encompassing the entire audible frequency
4. of electrical power combining the volt age with the electrical current required to drive the loud speaker Weight Low frequencies below 50Hz Woofer A driver designed to operate over the bass por tion of the audio range Classic Spec if All Classic Series products are sonically c ati on s matched for seamless integration into multichannel systems Absolute Zero Two Three Four TwoC Three C Ten Twelve System Type 2 Way Acoustic 2 Way Acoustic 3 Way Acoustic 4 Way Bass 3 Way Acoustic 3 Way Acoustic poate Se wats TEE ae Suspension Suspension Suspension Reflex Suspension Suspension Driver Complement Class G Amplifier Class G Amplifier Tweeter 1 fluid cooled aluminum dome 0 75 fluid cooled aluminum dome with neodymium magnet structure with neodymium magnet structure Midrange 2 fluid cooled aluminum dome with neodymium magnet structure Woofer 5 25 6 5 6 5 6 5 and 10 2 5 25 2 6 5 10 12 Polypropylene Polypropylene Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Video Shielded Unless Noted Not Video Shielded Not Video Shielded R 71Hz 20kHz 51Hz 20kHz 45Hz 20kHz 27Hz 20kHz 78Hz 20kHz 73Hz 20kHz 31Hz 180Hz 27Hz 180Hz esponse 3dB 3dB 3B 3dB 3dB 3dB 3dB 30B Sensitivity 86dB 2 83v 86dB 2 83v 86dB 2 83v 86dB 2 83v 870B 2 83v 870B 2 83v Impedance
5. spectrum Hertz Hz A unit equal to one cycle per second used to measure the frequency of a signal or sound High Pass Filter A filter that passes only high frequen cies above a lower limit Impedance A measure of the total opposition to current flow in an alternating current circuit measured in ohms In Phase The polarity of an audio signal when connect ed as follows to and to Integrated Amplifier A 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 The 1 channel of infor mation recorded on most multichannel digital sound for mats Line Level Connection Low level RCA phono or XLR type connection Load A term used to describe the impedance that a speaker presents to an amplifier Low Pass Filter A filter that passes only low frequen cies below a higher limit Main Speakers Front L amp R channel speakers some times referred to as satellites Main In A line level RCA XLR power amplifier input on the back of a receiver integrated amplifier or power amplifier Midrange The frequency span in the middle of the audio range roughly 180Hz 3000Hz Also used to describe the driver that reproduces these frequencies Ohm A unit of electrical resistance That which opposes an electric current in a conductor In audio a measure of the l
6. 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 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
7. K and above Fine Tuning Flow Chart Boomy EE Excessive Too Much Mid Upper Bass Low Mid Upper Lean But With Bass Bass Weight Weight Yy y y y Adjust Adjust Adjust Decrease Subwoofer Subwoofer Subwoofer Boundary Phase Phase Phase EQ 0 90 0 90 Switch Vv Continuously Continuously 0 180 Add Add Move Vv Vv y Subwoofer Farther Lower If this makes Increase From Wall Low Pass it worse Raise Boundary V X Over try gt gt gt Low Pass EQ Frequency If the sound Setting y Listen y improves y m Move Lower y Adjust Subwoofer Subwoofer Adjust Subwoofer Closer to Volume Subwoofer Volume Wall Vv Volume Vv Vv Listen Y Adjust Listen Listen Subwoofer Phase y Listen Operation We recommend that the Ten or Twelve power be left on which will allow the built in Auto Mode feature to disable the subwoofer when not in use Every speaker has limits and it s important to listen for them Speaker damage most often results not from brief loud musical peaks but from sustained high volume levels in some or all frequencies For this reason extreme volume settings and excessive bass treble or equalizer boosts are not recommended If you hear unusual distortion or breakup or notice heat coming from the woofer decrease volume immediately neutralize
8. al rod or water pipe The Ten and Twelve is ground ed to the power outlet through the third prong of the power cord The AC wiring in the building has the ground conductor connected to a metal rod or water pipe outside the building Once a patch cord is connected between the DSS system and the subwoofer a complete circuit is formed called a ground loop Current flowing in the ground loop can cause very large amounts of noise in the system To legally install cable TV or a DSS system there must be a ground conductor from the dish or cable tied to the earth outside of the building This guarantees that if struck by lightening the current will flow to ground earth outside of the building never endangering someone s life inside or damaging any equipment Removing the ground from the DSS or cable system is not a legal or moral option We use a grounded power cord on our powered subwoofers and amplifiers to ensure that the customer is always safe If there is ever any internal short in the subwoofer amplifier between the power sup ply and the chassis the current will be shunted to ground earth through the power cord and the fuse will blow The customer will never be in any danger of electric shock The proper way to break the ground loop in the system is to do it at the signal level This should be done at the output of the device that is causing the ground loop In this case it is the DSS or cable system The best way to do this is with
9. any excess bass treble or equalizer boosts and avoid setting any controls to similar extremes again Maintenance Your Ten and Twelve is designed for years of use with no or minimal maintenance as long as you avoid exposing it to direct sunlight high temperatures or moisture Clean cabinets when necessary using a damp cloth or a mild non abrasive cleaner to clean grilles remove from speaker and use a soft brush or a vacuum on its lowest setting Do not attempt to clean the actual driver Changing the Line Voltage Setting The Ten and Twelve were designed to operate on two line voltage settings 115VAC and 230VAC In the event that it is necessary to change the line voltage setting begin by turning the power switch to the off position Remove all the connections from the amplifier including the detachable power cord Using a flat blade screw driver slide the switch to the correct position Use the 115VAC position for 110 to 120 VAC and the 230VAC position for 220 to 240 VAC Next you will likely need a power cord that fits the AC receptacle and you will need to replace the fuse see Changing the Fuse below Changing the Fuse The Ten and Twelve amplifier s fuse is user serviceable To replace it e turn the power OFF e unplug the power cord e remove the fuse holder cover above to the power inlet with a flat blade screwdriver e remove the fuse from the holder and replace it with the appropriate type e reinstal
10. 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 rever
11. ffered pass through used for multiple subwoofers 9 Hi Level Input Speaker level input connector 10 Power Switch Turns the unit on and off 11 Fuse Holder location of the user servicable fuse 12 Power Inlet For universal AC line input connection 13 Input Voltage Switch Selects 115 VAC or 230 VAC mains voltage Connecting The Ten OR Twelve Caution Before connecting the Ten OR Twelve to your audio system it is important to unplug or turn off all AC power connections to connected components such as receivers amplifiers preamplifiers and processors Do not plug in or connect the Ten OR Twelve subwoofer to AC power until all connections have been made Integrating the Ten or Twelve into your surround system is simple and straightforward when using this connection method Your AV Receiver will control all crossover functions and the Ten or Twelve will control Subwoofer gain phase and boundary equalization Connect the Subwoofer LFE Output on your AV Receiver to the LFE IN on the back of the Ten or Twelve Fig 2 Main Speakers Reciever SPEAKER OUTPUTS L R LFE Sub Back of Subwoofer In the event your receiver or pre amp does not have a LFE or Subwoofer output the Ten Twelve has two addi tional connection methods 1 Line Level Use if You have an amp or receiver with Pre Out jacks but no LFE Subwoofer jacks To connect for a Line Level signal Fig 3 keep your main spea
12. inst the wall or any other surface The key to placing your subwoofer for optimal enjoyment is to remember that low frequencies produce sounds with long wavelengths which interact in complex ways with room boundaries such a walls and corners and other large objects as well Placing the subwoofer near to a room boundary will tend to increase its apparent bass output but may result in boomy or muddy sound Conversely placing it farther away from room boundaries will tend to decrease its apparent bass output but may result in improved articulation and clarity When possible place the subwoofer in the same horizontal plane and along the same wall as the main speakers And since small changes in subwoofer position can have a significant effect on sound experimenting with the effects of different placements in your own listening view ing room is the key to finding the sound you like best Ten and Twelve Features amp Controls Volume This control allows you to adjust the gain of the Subwoofer relative to the rest of your system Many lis teners make the mistake of setting subwoofers too loud which can cause excess bloat and loss of detail and musicality A properly calibrated subwoofer blends in with the speakers and does not call attention to itself To properly set volume e Turn down the volume control on the Ten and Twelve to its lowest position counter clockwise e Turn on your audio system including the Ten orTwe
13. its 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 Thank you for your purchase of the NHT Ten or Twelve powered subwoofer Like all NHT loudspeakers the Ten and Twelve develop ment has been guided by the study of human hearing it s design rigorously tested and its components optimized to deliver clean clear musical sound Since the quality of your speakers is one of the most important factors in maximizing the sound you ll get from your music and home
14. kers connected as usual but use RCA line level cables to connect as follows e Preamps with Line Out jacks connect one pair of Line Main Speakers Back of Subwoofer E Out cables to your main amp to power your main L amp R speakers and a second pair to the Ten OR Twelve LINE LEVEL INPUT If your preamp has only one pair of Line Out jacks you can use a pair of Y connector cords available through your NHT dealer e Amps and receivers with Pre Out jacks connect the Ten OR Twelve from the Pre Out into the Ten OR Twelve s Line Input 2 Hi Level Use if Your receiver has no Pre Out or Subwoofer LFE Out jacks To connect for a High Level signal Fig 4 use two addi tional pairs of speaker cables and connect as follows Reciever Main Speakers SPEAKER OUTPUT SPEAKER OUTPUT Back of Subwoofer e For amps and receivers with separate A and B speaker outputs connect one pair of speaker cables from your receiver s Speaker A outputs to your main L amp R speakers and a second pair from your receiver s Speaker B outputs to the Ten OR Twelve s High Level Input Use this method only if both A amp B speaker outputs can operate simultaneously e For amps and receivers with only one set of speaker output terminals simply feed the same signal in parallel to both your main L amp R speakers and the Ten OR Twelve Connect one pair of speaker cables from your com
15. l the fuse holder Always replace the fuse with one of the exact same specifications Ten For systems operating at 115 volts use only a 5x20 mm T3A 250 volt slow blow fuse For systems operating at 230 volts use only a 5x20 mm T2 0A 250 volt slow blow fuse Twelve For systems operating at 115 volts use only a 5x20 mm T5A 250 volt slow blow fuse For systems operating at 230 volts use only a 5x20 mm T2 5A 250 volt slow blow fuse Troubleshooting If the Ten or Twelve fails to operate at all when the Power Switch is turned on thoroughly check the power cord input and output connections If the Ten or Twelve turns on but the LED indicator fails to illuminate mis wiring or a power surge may have caused the protection fuse to blow Replace it with one of correct type and value If the Ten or Twelve turns on but its status LED stays red the unit is gone into protect mode which could be caused by incorrect wiring short circuits or excessive volume Turn off the Power Switch on the subwoofer for two or more seconds to reset and double check all speaker cables to be sure that no small metal strands are shorting the terminals If the Ten or Twelve subwoofer has a loud hum when you turn it on The following is what you can do to get rid of the hum The DSS system and all cable TV systems have a ground wire connected to the shield of the signal on the outside of the house and driven into the earth with a met
16. lve Play some music you are familiar with and set your receiver preamplifier volume to a comfortable listening level e Slowly increase the volume of the Ten or Twelve lis tening for proper frequency balance When balanced you will hear improved bass extension but not be aware that it is coming from the subwoofer From this point on the volume control on your receiver preamplifier will control the overall volume of your system including the subwoofer The Boundary EQ This is a feature unique to NHT products Reflective boundaries such as walls rein force a speaker s bass output 3dB for two walls 6dB for a corner if the subwoofer is placed near them Conversely placing a subwoofer out in the room results in a relative decrease in bass output Boundary rein forcement may lead to low frequency response that is uneven Some frequencies will sound exaggerated rela tive to others or the subwoofer will sound thin and lack impact The Boundary EQ control allows you to com pensate for the effects of room boundaries on the fre quency response of the subwoofer Adjusting the control enables you to achieve smooth low frequency output from the subwoofer regardless of its location in your room The following diagrams shown in Fig 1 show the corre lation between subwoofer placement and Boundary EQ These diagrams are guidelines only Your room acoustics and personal tastes will ultimately dictate the final setting Bounda
17. oad presented by a device to an electrical source Out of Phase The polarity of an audio signal when con nected as follows to and to Passive Uses no electrical power Phase An expression of the relative polarities of two sig nals Power Handling The ability of a loudspeaker to operate without large increases in distortion when given varying amounts of input power Preamplifier An electronic device that selects sources and passes line level signals to an amplifier Pre Out A preamp line level RCA output on the back of a receiver integrated amplifier or preamplifier Receiver A preamplifier amplifier and tuner built into one chassis Satellite Front L amp R speakers when used with a sub woofer Also referred to as main speakers Sensitivity A ratio of voltage across the speaker load to the acoustic power output measured in decibels Sub Out An line level output for connection to a sub woofer or subwoofer signal processor 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 phys ically 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 con sisting of frequencies above about 3000HZz Tweeter A small driver designed to reproduce high fre quencies Watt A measure
18. ponent s speaker output terminals to the L amp R speakers and a second pair from the same output ter minals to the Ten OR Twelve s High Level input The Ten OR Twelve s input does not present a significant load to the receiver and will not compromise its output to the L amp R speakers If you find that your receiver will not accommodate more than one cable per output terminal check with your NHT dealer for alternative methods of connection With all signal connections complete it is now time to apply AC power Plug the power chord into the power inlet in the back of the subwoofer plug the other end into into the wall outlet and switch the subwoofers power to the ON position The frequency chart below lists some terms commonly used to describe different bands of the frequency spectrum Listen to your system and make adjustments to achieve a seamless blend between your main speakers and the Ten or Twelve Four common problems are outlined below Follow the flow chart to correct these See the glossary for any terms you are unfamiliar with Fine Tuning the Subwoofer The key to good subwoofer speaker integration is repeated listening followed by making small re adjust ments 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 eee eee onan Below 50Hz 50Hz 100Hz 100Hz 180Hz 180Hz 300Hz 300Hz 700Hz 700Hz 3K 3
19. ry Half alt o Space a Quarter P77 ae Half Jo Space 34B Boundary A 0 3dB LOW PASS FILTER This control determines the upper limit frequency the subwoofer will reproduce For example setting the filter at 100Hz will cause the subwoofer to reproduce only frequencies below 100HZz The Low Pass Filter is continuously variable between 40Hz low bass and 180Hz upper bass to accommodate different speakers Two tips on using the Low Pass Filter As a Starting point set Low Pass Filter to the 1 o clock position This will result in an 80Hz low pass As the set ting is typical for most Dolby Digital DTS applications Note The LFE input bypasses the adjustable 12dB Low Pass Filter See the Fine Tuning section for further adjustment guidelines SUBWOOFER PHASE This switch sets the phase 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 if 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 phase can improve blending and balance To properly set the Subwoofer Phase e Play familiar music reversing phase settings And listen from your usual position e Avoid evaluating while standing above the subwoofer or amplifier so
20. sing 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 exhib
21. theater system we re sure that you ll find your purchase of the Ten and Twelve a good investment and invite your comments If you find your experience with the Ten and Twelve as satisfying as we believe you will and wish to enjoy its high quality sound through your entire system you ll find information about other sonically matched NHT Classic Series loudspeakers on the back of this manual Background The NHT Ten and Twelve Powered Subwoofers are compact versatile and powerful amplified subwoofer designed to provide low frequency reinforcement for high performance audio and home theater systems The Ten and Twelve features e line level and speaker level inputs for connection with all types of receivers or other audio components e independent gain phase and low pass filter controls e boundary control for adjusting system sound for various room placement Please take a few minutes to read through this owner s manual before setting up your speakers this information will help you get the most out of them Also please keep the Ten or Twelves packaging to use in case you move or transport them If you have questions at any time during setup or use feel free to call your NHT dealer or our Toll Free Customer Hotline at 1 800 NHT 9993 Placement Note To prevent the Ten and Twelve subwoofer amplifi er from overheating always be sure to provide adequate space for proper ventilation Do not place the subwoofer directly aga
22. und at the listening position will be significantly different e The correct setting is the one in which the bass is the loudest at the listening position POWER MODE This feature automatically switches your Ten or Twelve into minimum power mode ie sleep whenever no signal is present for 20 minutes When a signal is received it immediately turns on again As AUTO Mode is automatic it requires no adjustment nor is there a need to turn the Ten or Twelve on and off every time it is used When in ON Mode the subwoofer is always on Powered Subwoofer Back of Subwoofer refer to diagram above 1 Power Mode Leaves Subwoofer in permanantly on ON or puts the subwoofer in automatic standby mode AUTO 2 Power Indicator The light is green when the sub woofer is on The light is amber when the subwoofer is in stand by mode The light is red when the subwoofer is in protection 3 Volume Control Adjusts the loudness of the subwoofer independently of the main speakers 4 Low Pass Filter Continuously variable low pass crossover control 5 Boundary Switch Selects response mode of subwoofer depending on placement 6 Subwoofer Phase Selector 2 position selectable phase control for subwoofer 0 180 7 Line Input Low level RCA input jacks for L R signals 8 LFE In Out Low level RCA input jack for LFE or subwoofer signal Out is an unbu
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