Infinity BU
Contents
1. H AVE L outeur RIGHT BU 1 SUBWOOFER PLATE LEFT BU 1 SUBWOOFER PLATE Rear View R SATELLITE Rear View L SATELLITE 8 Powered Subwoofer BU 1 Owner s Manual SET CONTROLS Power ON ADJUST VOLUME FREQUENCY CONTROL Room PLACEMENT OPERATION 1 Set the subwoofers Volume control Fig 2 to 12 o clock Set the subwoofers Low Frequency Rolloff control Fig 2 to 12 o clock Switch the subwoofers AC Power switch Fig 2 to the ON position Turn on your entire audio system Turn the Volume control Fig 2 to its mid position If no sound emanates from the Subwoofer after the auto sensing system turns it on check the AC line cord and input cables Are the connectors on the cables making proper contact Is the AC plug connected to a live receptacle Once you have confirmed that the subwoofer is active proceed by playing a CD record or cassette Use a selection that has ample bass information Set the overall volume control of the preamplifier or stereo to a comfortable level Begin with the subwoofers Frequency Fig 2 and Volume Fig 2 control at the 12 o clock position Adjust the subwoofers Volume control Fig 2 until you obtain a pleasing blend of bass Bass response should not overpower the room but rather be adjusted so there is a harmoniou2. A FEW SUGGESTIONS We recommend that you not operate your speakers or subwoofer with the bass treble and loudness controls set to full boost This will place undue strain on your electronics and speakers and could damage them The volume control setting on your preamplifier or stereo receiver is not a specific indication of the overall loudness level of the speakers The only important consideration is the loudness level at which the system can be played regardless of where the volume control is set Always turn down the volume control setting on your preamplifier or stereo when changing a cassette or CD or switching inputs to AM or FM operation Excessively loud transients clicks or popping sounds can damage the satellite speakers and possibly the subwoofer Whenever changing cables pulling plugs etc ALWAYS TURN OFF ALL EQUIPMENT including the subwoofer This prevents transients from entering the speakers and prevents electrical energy from reaching you Keep all connections out of the reach of children Powered Subwoofer BU 1 Owners Manual 1 POSITION WITHIN A Room WILL STRONGLY INFLUENCE PERFORMANCE 2 Powered Subwoofer BU 1 Owner s Manual POSITIONING Since the installation of a subwoofer is somewhat more complicated than installing full range speakers it is essential you read this section very carefully prior to connecting the subwoofer to your system Should you have questions relating to your installation
3. BU Powered Subwoofer Model BU 1 Owner s Manual Part 930 7304 Infinity The lightning flash with arrowhead C A U T I O N symbol within an equilateral triangle is intended to alert the RI SK OF ELECTRI C SHOCK user to the presence of uninsulated dangerous voltage within the DO N OT OP EN product s enclosure that may be of sufficient magnitude to constitute WARNING SHOCK HAZARD DO NOT OPEN a risk of electric shock to persons AVIS RISQUE DE CHOC ELECTIQUE NE PAS OUVRIR The exclamation point within an equilateral triangle is CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER 0R BACK intended to alert the user NO USER SERVICEABLE PARTS INSIDE o the presenca or impartant operating and maintenance servicing instructions in the literature accompanying the product THIS INFINITY PRODUCT IS DESIGNED FOR 120 VOLT USE ONLY FOR DETAILED SAFETY PRECAUTIONS PLEASE SEE PAGE 13 IN THIS OWNER S MANUAL FOR IMPORTANT SAFETY INSTRUCTIONS L clair avec le symbole de la fl che plac dans les limites dun triangel quilat ral est pr vu pour avertir l utilisateur de la pr sence de tension dangereuse non isol e dans l enceinte du produit qui pourrait tre d une importance suffisante pour pr senter un resque d lectrocution aux personnes REFER SERVICING TO QUALIFIED PERSONNEL Le point d exclamation dans un triangel equilateral est pr vu pour avertir l utilisateur de la pr s
4. it is advisable to call either your dealer or Infinity s Customer Service Department for advice The performance of the subwoofer is directly related to its placement in the listening room and how you align the subwoofer with its satellite speakers Setting the volume of the subwoofer in relationship to the left and right speakers is also of critical importance because it is essential that the subwoofer integrates smoothly with the entire system Setting the subwoofer volume level too high will result in an overpowering boomy bass Setting the volume level too low will negate the effect of the subwoofer The metal plate acts as the heat sink for the subwoofer internal amplifier Do not place pillows or other objects against it We recommend placing the BU 1 at least 2 to 3 feet away from a television or a computers disc drive system to prevent smearing the colors of the TV picture or erasing of the magnetic drive Here are several additional facts on installation that may prove useful It is generally believed by most audio authorities that low frequencies below 125Hz are nondirectional and therefore placement of a subwoofer within any listening room is not critical While in theory it is true that the larger wavelengths of extremely low frequencies are basically non directional the fact is that when installing a subwoofer within the limited confines of a room reflections standing waves and absorptions generated within the room will stron
5. NTENNA LEAD IN WIRE GROUND L CLAMP T ap ANTENNA DISCHARGE UNIT NEC SECTION 810 21 GROUNDING CONDUCTORS ELECTRIC NEC SECTION 810 21 SERVICE EQUIPMENT GROUND CLAMPS POWER SERVICE GROUNDING ELECTRODE SYSTEM NEC SECTION 810 21 15 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 16 Power Lines An outside antenna system should not be located in the vicinity of overhead power lines or other electric light or power circuits or where it can fall into such power lines or circuits W hen installing an outside antenna system extreme care should be taken to keep from touching such power lines or circuits as contact with then might be fatal 17 Overloading Do not overload wall outlets extension cords or integral convenience receptacles as this can result in a risk of fire or electric shock 18 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 N ever spill liquid of any kind on the product 19 Servicing Do not attempt to service this product yourself as opening or removing covers may expose you to dangerous voltage or other hazards
6. Refer all servicing to qualified service personnel 20 Damage Requiring Service Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions a When the power supply cord or plug is damaged b If liquid has been spilled or objects have fallen into the product c If the product has been exposed to rain or water d If the product does not operate normally by following the operating instructions Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation e If the product has been dropped or damaged in any way f When the product exhibits a distinct change in performance this indicates a need for service 21 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 substitutions may result in fire electric shock or other hazards 22 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 isin proper operating condition 23 Wall or Ceiling Mounting The product should be mounted to a wall or ceiling only as recommended by
7. SUBWOOFER CONT D The BU 1 subwoofer may be connected to your system using the HIGH LEVEL INPUTS 4 on the plate located on the rear panel of the subwoofer Use ordinary lamp cord maintaining proper polarity to and to Attach the lamp cord to the left and right HIGH LEVEL INPUTS on the subwoofer and the other ends to the proper left and right OUTPUTS on your amplifier or receiver see Figure 5 If you plan to use two subwoofers one for the left and the other for the right channel connect wires from the left and right OUTPUT on your power amplifier or receiver and attach the other ends to the corresponding HIGH LEVEL INPUTS on each subwoofer Observe polarity see Figure 6 AMPLIFIER OUTPUTS FRIGHT r LEFT ee DAANG SUBWOOFER PLATE AMPLIFIER OUTPUTS rRIGHT gt LEFT4 ll CII ILE Ba SCC o RIGHT BU 1 LEFT BU 1 SUBWOOFER SUBWOOFER PLATE PLATE Powered Subwoofer BU 1 Owners Manual 7 CONNECTING YOUR SUBWOOFER CONT D AMPLIFIER OUTPUTS Figure 7 Method when
8. arious locations in your listening room before you choose the final location Some possible starting points include behind the right channel satellite speaker along the back wall between the satellites along a side wall but not too close to a corner or behind a couch or a chair In general the closer the subwoofer is to walls and corners the greater the effect of low frequency enhancement Experiment with the Frequency and Volume controls in different locations until you are pleased with the result you obtain from your particular application Powered Subwoofer BU 1 Owners Manual 9 10 Powered Subwoofer BU 1 Owner s M anual A Worp OF ADVICE The Low Frequency Rolloff and Volume controls may be set anywhere within their rotation However it will be a most unusual circumstance if you have to set the Volume control completely clockwise This may indicate an unbalanced condition in your system too much bass or an especially large room or room placement may not be correct Try several other locations before concluding that the Volume control must be set at maximum In the event that the subwoofer is located so far from the listening area that its effect is not as prominent as desired you may find that reversing the phase of the High Level Input wires may help Connect the speaker output terminals to the High Level Input terminals of the subwoofer on BOTH channels Reversing the phase on only one channel will cance
9. ate from battery power or other sources refer to the operating instructions 12 Grounding or Polarization This product may be equipped with a polarized alternating current line plug a plug having one blade wider than the other This plug will fit into the power outlet only one way This is a safety feature If you are unable to insert the plug fully into the outlet try reversing the plug If the plug should still fail to fit contact your electrician to replace your obsolete outlet D o not defeat the safety purpose of the polarized plug 13 Power C ord Protection Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them paying particular attention to cords at plugs convenience receptacles and the point where they exit from the product 14 Outdoor Antenna Grounding If an outside antenna or cable system is connected to the product be sure the antenna or cable system is grounded so as to provide some protection against voltage surges and built up static charges Article 810 of the National Electrical Code ANSI NFPA 70 provides information with regard to proper grounding of the mast and supporting structure grounding of the lead in wire to an antenna discharge unit size for grounding conductors location of antenna discharge unit connection to grounding electrodes and requirements for the grounding electrode See Figure A FigureA A
10. connecting are one subwoofer to satellites HS DE mim O BU 1 SUBWOOFER PLATE Rear View Rear View R SATELLITE L SATELLITE Depending on whether you are using one or two BU 1 subwoofers connecting your satellites can be accomplished in one of two ways If you are using a single BU 1 with a pair of satellites connect them as shown in Figure 7 If you are using two BU 1 subwoofers as a stereo pair with a pair of satellites connect them as shown in Figure 8 IMPORTANT The BU 1 subwoofer does not have a built in passive crossover which would roll off your satellites lower frequencies However the BU 1 does have a variable frequency control that can be used to block unwanted frequencies between 50 150Hz from being reproduced by the subwoofer Where you set this control depends on the low frequency capabilities of your satellite speakers Adjust this knob to the lowest frequency that your satellite speakers were designed to reproduce refer to Operation step 8 AMPLIFIER OUTPUTS RIGHT r LEFT Il CNE E Figure 8 Method when connecting two subwoofers to satellites H veL outeur AUTO POWER POWER
11. en using two subwoofers one for the left and another for the right channel connect the left preamplifier output to BOTH the left and right LOW LEVEL INPUTS of the subwoofer used for the left channel by using a Female to Male Y connector at the subwoofers input and the right channel preamplifier output to both jacks of the right channel subwoofer in the same manner see Figure 4 If the preamplifier has a mono subwoofer output you ll also need a Male to Female Y connector to split the mono signal to the subwoofer pair see Figure 4 Figure 4 Method when using single subwoofer or two subwoofers Preamp with mono SUB OUT OR subwoofer output L R set of outputs OUTPUTS Preamp with one Male to Female Y Connector esocoesecece To Left ocecececce To Right Deseceeceeececeececece So LEFT J pte 1 6 Pea a O oe a i o ESS RIGHT BU 1 er s SUBWOOFER Female to Male SUBWOOFER a PLATE Y Connector RIGHT PLATE e M S De 6 Powered Subwoofer BU 1 Owner s Manual Figure 5 Method when using single subwoofer Figure 6 Method when using two subwoofers CONNECTING YOUR
12. ence d instructions importantes pour les op rations et l entretien service dans les manuels fournis avec l appareli ATTENTION POUR EVITER LES CHOCS ELECTRIQUES INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQUAU FOND IMPORTANT SAFETY INSTRUCTIONS 1 Read Instructions All the safety and operating instructions should be read before the product is operated 2 Retain Instructions The safety and operating instructions should be retained for future reference 3 Heed Warnings All warnings on the product and in the operating instructions should be adhered to 4 Follow Instructions All operating and use instructions should be followed 5 Cleaning Unplug this product from the wall outlet before cleaning Do not use liquid cleaners or aerosol cleaners U se a damp cloth for cleaning Exception A product that is meant for uninterrupted service and that for some specific reason such as the possibility of the loss of an authorization code for a CATV Converter is not intended to be unplugged by the user for cleaning or any other purpose may exclude the reference to unplugging the product in the cleaning description otherwise required in number 5 6 Attachments Do not use attachments not recommended by the product manufacturer as they may cause hazards 7 Water and Moisture D o not use this product near water for example near a bathtub washbowl kitchen sink o
13. g circuit that automatically turns the subwoofer on when detecting music or voice signals The absence of an audio signal for approximately six minutes will cause the auto sensing circuit to shut down the system VOLUME FREQUENCY CONTROL Hz AUTO O POWER POWER ON OFF R L t HIGH LEVEL OUTPUT O WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE CAUTION m ae UL 1492 NTINK WARNING SHOCK HAZARD DO NOT OPEN EI AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR MODEL BUT Hom 120V 60Hz 130W NOT SUITABLE FOR ALL IN WALL MOUNTING 120V 60Hz 130W O TURN OFF ALL POWER IMPORTANT Figure 3a Low level signal can be used from your preamp s output by connecting second set of output jacks to the rear of your amplifier CONNECTING YOUR SUBWOOFER There are several ways to connect your BU 1 subwoofer Read this section carefully to determine which method is best suited for your installation The BU 1 may be fed directly with a low level signal taken from your preamplifiers output by using the second set of output jacks on the rear of your preamplifier see Figure 3a If your preamplifier has only one set of outputs you may use two 2 Y connectors see Figure 3b to connect your subwoofer Use standard shielded leads terminated at each end with male RCA connectors Connect one end of each stereo pair of lead
14. gly influence the performance of any subwoofer system As a result specific location of the subwoofer becomes important and we strongly recommend that you experiment with placement before choosing a final location Placement will depend upon your room and the amount and quality of bass required for example whether or not your room permits placement of the subwoofer near either satellite Never place the port too close to a wall or piece of furniture as this will prevent the port from operating properly Since the port is an integral part of the subwoofer design it should always be permitted free access to the listening room without obstruction to the pressure emerging from it Careful experimentation will enable you to determine the best position for the subwoofer see useful hints next page Figure 1 This view shows the subwoofer positioned behind the right channel satellite speaker to re create the actual location of bass instruments in an orchestra ee BU 1 SUB _ A lt RIGHT CHANNEL SATELLITE PRIMARY LISTENING AREA Here are some useful hints 1 Experimentation with the port direction may be useful At times directing the port away from the listening area to the side may be advantageous because this may create a better blend of bass within the listening room 2 If bass response seems inadequate move it closer to a wall or corner If bass becomes too heavy try turning
15. ity Systems Inc 250 Crossways Park Drive Woodbury NY 11797 USA 800 553 3332 www infinitysystems com Infinity is a registered trademark of Infinity Systems Inc H A Harman International Company P N 930 7304
16. l out the signal to the subwoofers amplifier resulting in less output from the subwoofer OVERDRIVE PROTECTION Automatic limiting circuitry helps prevent overdriving a connected subwoofer by softly clipping the input signal if it exceeds a predetermined threshold Depending on the level you may or may not hear slight distortion on musical peaks This protection is completely automatic with no user adjustments However if you do hear distortion continuously while playing music the input signal level feeding the BU 1 may be too high and should be lowered If this doesnt solve the problem verify the connections and check for proper operation of other components in the audio chain A Worp ABOUT TONE CONTROLS The tone controls on your electronic components preamplifier receiver etc should be used with the utmost discretion Excessive boost can create severe power demands on your power amplifier Maximum bass boost can create a demand for literally hundreds of watts in the bass region whereas in the flat position or with the tone controls switched out of the system your average listening level may be impressively and realistically loud at less than 10 watts The remaining power capacity required is on reserve for power peaks on sharp transients and powerful crescendos IMPORTANT IMPORTANT IMPORTANT CARE OF YOUR SUBWOOFER Your Infinity subwoofer cabinet is finished with a heavy duty high quality vinyl which requi
17. n Make sure the subwoofer is plugged in and turned on If everything seems to be in good working order and the subwoofer still malfunctions DO NOT ATTEMPT ANY REPAIRS Contact your Infinity dealer and get the name of the authorized Infinity service center near you If there is no facility near you contact Infinity s Customer Service Department at 800 553 3332 or write Infinity Systems Inc CUSTOMER SERVICE 250 Crossways Park Drive Woodbury NY 11797 USA Do not ship your subwoofer for service without prior approval RETURN AUTHORIZATION and do not ship without enclosing a copy of your original bill of sale Powered Subwoofer BU 1 Owners Manual 11 PERFORMANCE DATA Drive UNITS FINISH DIMENSIONS 12 Powered Subwoofer BU 1 Owners Manual SPECIFICATIONS BU 1 Frequency Response Input Sensitivity Input Impedance Output Driver Crossover Frequency Cabinet Finish Width Height Depth 45 150Hz 3dB Low Level 50mV High Level 1V Low Level 10kQ High Level 200k 50W RMS 8 woofer 50 150Hz continuously variable Ebony Pica 11 1 2 29 2cm 11 1 2 29 2cm 11 1 2 29 2cm Does not include 1 1 4 3 2cm for feet Infinity continually strives to update and improve existing products as well as create new ones The specifications and construction details in this and related Infinity publications are therefore Subject to change without notice 1999 Infin
18. r laundry tub in a wet basement or near a swimming pool and the like 8 Accessories Do not place this product on an unstable cart stand tripod bracket or table The product may fall causing serious injury to a child or adult and serious damage to the product Use only with a cart stand tripod bracket or table recommended by the manufacturer or sold with the product Any mounting of the product should follow the manufacturer s instructions and should use a mounting accessory recommended by the manufacturer 9 A product and cart combination should be moved with care Quick stop excessive force and uneven surfaces may cause the product and cart combination to overturn 10 Ventilation Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the product and to protect it from overheating and these openings must not be blocked or covered The openings should never be blocked by placing the product on a bed sofa rug or other similar surface This product should not be placed in a built in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer s instructions have been adhered to 11 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 of power supply to your home consult your product dealer or local power company For products intended to oper
19. res very little maintenance Keep the cabinet clean by dusting it occasionally with a damp cloth or use a good quality furniture polish to maintain its original luster When using aerosol products always spray the cloth not the speaker to prevent any of the product from drifting onto the electronics of the unit FEEDBACK If the bass seems boomy or you notice a rumbling sound when listening to record albums the cause may be acoustic feedback This means that low frequency vibrations from your speakers are reaching the turntable To help isolate the turntable from these vibrations place the turntable on a heavy solid support as far away as possible from the subwoofer If you continue to experience difficulties after experimenting with placement consult your Infinity dealer CD players are also susceptible to acoustic feedback and should be placed on solid supports to isolate them acoustically Another method to isolate the CD player is to place it on four isolation feet available at your local dealer IN CASE OF TROUBLE WITH YOUR SUBWOOFER If the subwoofer sound is distorted stops playing or otherwise seems to be malfunctioning first determine if the problem is in the subwoofer or the wiring and or other audio components If the problem also affects the satellite speakers the cause is most likely in your electronics If it is only noticed in the subwoofer make sure that all connecting cables are correct and in proper working conditio
20. s blend across the entire musical range Many users have a tendency to set the subwoofer volume too loud following the belief that a subwoofer is there to produce lots of bass This is not entirely true A subwoofer is there to enhance bass extending the response of the entire system so the bass can be felt as well as heard However overall balance must be maintained otherwise the music will not sound natural An experienced listener will set the volume of the subwoofer so its impact on bass response is always there but is never obtrusive The Frequency control Fig 2 sets the high frequency roll off adjustable from 50 to 150Hz Where this control is set depends on the low frequency capabilities of your satellite speakers system placement and other factors affecting the mid bass region Turn the control UP clockwise until you feel there is too much mid bass information around 100Hz then back the control down a bit until that area sounds more natural If you are pleased with the mid bass but want to hear more low bass turn the Frequency control DOWN abit and the Volume control UP by about the same amount This will increase low bass while leaving the mid bass sounding the same as it did before the adjustment To get a reduction in low bass without changing mid bass turn the Frequency control UP and the Volume control DOWN Room placement of the subwoofer is the most critical aspect of its installation It will be necessary for you to try v
21. s to your preamplifiers left and right outputs and connect the other end to the corresponding left and right LOW LEVEL INPUTS 1 on the subwoofer If you are using a tube preamplifier and the connecting leads will be longer than 10 feet 3 meters we recommend not using the above connection method A tube preamplifier may not be able to handle the capacitance introduced by leads over 10 feet in length Instead try using the high level connection methods listed on page 7 OUTPUTS LOOR pa Pocococococooooooooooo TO SATELLITE wee cccccecccceecceee SPEAKER AMPLIFIER L OR Preamp with two sets of outputs HIGH LEVEL INPUT f RS SA tow fever FES infix POWER powen O aAA eo O oo ee BU 1 SUBWOOFER PLATE Powered Subwoofer BU 1 Owners Manual 5 CONNECTING YOUR SUBWOOFER CONT D Figure 3b You can use this method 2 Y connectors if your preamp has only one set of outputs OUTPUT Preamp with one set of outputs fT N Y Connector Pa a TO SATELLITE SPEAKER AMPLIFIER D N e SUBWOOFER PLATE Ly When using a single subwoofer you MUST use a pair of stereo low level leads from your preamplifiers outputs Wh
22. the manufacturer 24 Heat The product should be situated away from heat sources such as radiators heat registers stoves or other products including amplifiers that produce heat ABOUT THIS PRODUCT IMPORTANT VOLUME CONTROL IMPORTANT INTRODUCTION The Infinity BU 1 Powered Subwoofer has been designed to enhance the bass frequencies of any audio system This subwoofer may be used with speakers of any size Obviously the greatest bass enhancement will be achieved when the subwoofer is connected with speakers that do not have the capability to create deep bass This subwoofer may be used individually or combined with another BU 1 for even more impressive reproduction of bass frequencies i e one subwoofer near the satellite speakers and a second subwoofer behind the primary listening area or both subwoofers up front The BU 1 is a self powered system utilizing a solid state low frequency monophonic amplifier driving a specially designed woofer mounted within a structurally rigid tuned port enclosure UNPACKING THE SUBWOOFER Check your subwoofer carefully If it has been damaged in transit report the damage immediately by calling your dealer and or the trucking firm that delivered it To prevent fire or shock hazard DO NOT EXPOSE THIS SUBWOOFER SYSTEM TO RAIN OR EXCESSIVE MOISTURE To avoid electric shock DO NOT OPEN THE SUBWOOFER There are no user serviceable parts inside Observe all warnings and cautions
23. the subwoofer with the port facing away from the wall This will tend to diminish bass output It will take time and patience to find the most pleasing acoustic location for your subwoofer Testing for sonic balance and blending should always be made for your normal listening position using a wide range of source material As a starting point initially place the subwoofer behind your right channel satellite speaker about 3 or 4 inches from the wall We suggest trying this location first because in an orchestra the bass instruments are usually located in the back and to the right see Figure 1 Powered Subwoofer BU 1 Owners Manual 3 CONTROLS BEFORE CONNECTING YOUR SUBWOOFER Figure 2 4 e Powered Subwoofer BU 1 Owner s Manual IDENTIFICATION OF CONTROLS AND CONNECTING AC POWER Refer to Figure 2 to identify the controls of your subwoofers internal amplifier AC Power on off switch for AC power to amplifier High Level Input and Output Terminal Strips Low Level Input Jacks connect to preamplifier outputs Volume Control controls volume of subwoofer Frequency controls upper corner roll off point Turn off your entire audio system prior to connecting your subwoofer Make sure the subwoofers ON OFF switch is in the OFF position If using an unswitched AC outlet on your receiver or amplifier is not possible connect your subwoofer to an unswitched AC wall outlet The BU 1 includes an Auto Sensin
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