Sunfire 913-047-00 Stereo Amplifier User Manual
Contents
1. Pa pue Sunfire from his mind amp soul Symphonic Reference Load Invariant High Fidelity Stereo Power Amplifier User s Manual CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Safety Instructions 1 Read Instructions All the safety and operation instructions should be read before the Sunfire Component is operated 2 Retain Instructions The safety and operating instructions should be kept for future reference 3 Heed Warnings All warnings on the Component and in these operating instructions should be followed 4 Follow Instructions All operat ing and other instructions should be followed 5 Water and Moisture The Component should not be used near water for example near a bathtub washbowIl kitchen sink laundry tub in a wet basement or near a swimming pool etc 6 Ventilation The Component should be situated so that its location or position does not interfere with its proper ventilation For example the Component should not be situated on a bed sofa rug or similar surface that may block any ventilation openings or placed in a built in installation such as a bookcase cabinet or closed equip ment rack that may impede the flow of air through ventilation openings 7 Heat The Component sho2. Pin 1 is ground Pin 2 is positive hot Pin 3 is negative cold Balanced connections pass the input signal along two conductors If there is any external noise and inter ference passing into the audio lines both conductors will receive the same amount of noise This noise is then rejected in the balanced input stage of the Sunfire Amplifier 5 Outputs The top post of each pair is the positive out put and connects to the positive red post of your speaker The bottom post of each pair is the negative and con nects to the negative black post of your speaker The posts can accept bare wire spade terminals and dual or single banana connectors 6 IEC Connector The amplifier comes with a detachable Linecord which attaches here Make sure it is firmly pushed in place Connect the other end to an AC outlet which is properly configured for the type of plug and has the correct voltage for your model 7 Line Fuse If this fuse fails replace it with the exact same Slow Blow type and cur rent rating A Note Always unplug the power cord from your AC out let before removing the fuse Use a flat headed screw driver push in slightly and gently rotate the fuseholder half a turn Sunfir User s Manual Installation Read and follow all safety instruc tions shown on pages 2 and 3 Observe the following precautions when choosing a location for your amplifier e Do not cover any of t
3. return ground shipping costs will be prepaid if repairs were covered by the scope of this Warranty 15 Sunfire User s Manual Ba uni Sunfire from his mind amp soul Symphonic Reference Load Invariant High Fidelity Stereo Power Amplifier Sunfire Corporation P O Box 1589 Snohomish WA 98291 Manual part number 913 047 00 Rev A
4. Disconnect all connections from the preamplifier to your TV VCR or DVD e Disconnect any component which has a grounded power cord e Ifthe hum persists disconnect all the source components one at a time from the back of the preamplifier until you identify the problem e Ground loop isolators are avail able for audio lines and video You can ask your Sunfire Dealer for assistance e Try moving the speaker cables away from any power cords Try just one speaker connect ing it to each amplifier channel and see if one channel is bad e If you are still having a prob lem remember that Sunfire s dealers and technical support staff will assist you Other causes of noise Speaker noise may also be caused by interference or noise on your AC line Make sure there are no large ap pliances sharing the line or halogen lamps or light dimming Triac devices e Try connecting your system to another AC socket on a sep arate line e Keep power cords away from audio cables e Do not place the preamplifier directly on top of the amplifier e If the hum is heard from within the amplifier and not through the speakers this may also be caused by interference on the AC or DC lines The power transformers may turn this interference into an audible noise Internal hum can be made worse by a shelf or cabi net resonating so try moving the amplifier to another shelf gt SiNi User s Manual APPENDIX Try mov
5. 500 watts per channel into 4 ohms e QOutrageously low 115 dB Noise e An enormous power source provides the ultimate muscle for limitless dynamics e Peak to peak current output capability is 80 amperes per channel e The amplifier can drive almost any load to any rationally us able current or voltage level e MOSFET tracking downcon verter e 12 VDC trigger input for remote turn on e The intrinsic frequency response extends from 1 Hz to beyond 100 kHz IEC removable power cord e High quality styling and finish gt _ Sunfire User s Manual Overview Your Sunfire Symphonic Refer ence Amplifier is actually two high powered amplifiers combined in a 17 inch wide chassis It accepts line level signals from a controlling preamplifier and amplifies them to a higher speaker level suitable for driving powerful stereo and Home Theater speakers Rear Panel Features ALWAYS ON AUTO ON ALWAYS D NORMAL USE EITHER 12VDC TO TURN ON BALANCED INPUTS Built under on of the following patents 4 218 660 4 5 748 1 2 1 AUTO ON OFF Switch Your Sunfire Amplifier is designed with an automatic on off circuit In the AUTO ON center position the amplifier will au tomatically turn on if an audio signal is present at the left or right input or if it receives an input trigger voltage at the 12 VDC inputs The amplifier will automatically turn off after a few seconds if the trigger volt
6. grounding or polarization means of the Component is not defeated This apparatus does not exceed the Class A Class B whichever is ap plicable limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Ca nadian Department of Communications ATTENTION Le pr sent appar eil num rique n met pas de bruits radio lectriques d passant las limites applicables aux appareils num riques de class A de class B selon le cas prescrites dans le r glement sur le brouillage radio lectrique dict par les ministere des communications du Canada WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT FULLY INSERT ATTENTION POUR EVITER LES CHOCS ELECTRIQUES INTRO DUIRE LALAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND Contents A Safety Instructions Chapter 1 Introduction Unpacking and List of Features Overview Rear Panel Features Installation Fa Appendix Series and Parallel Chapter 2 System Configurations Troubleshooting Guide Specifications Limited Warranty Service Assistance Please read the Safety Instructions carefully before connecting and using your Sunfire Amplifier Chapter 1 is a general introduction to the features details and insta
7. have an internal short Measure all speakers and check their impedance specifications 12 e If you have connected speakers in Parallel the overall impedance may be too low It is recommended that you rearrange the speakers in Series to increase the overall impedance thus taking some of the load off the amplifier Make sure that the amplifier has good ventilation and is not overheating If the amplifier is in a closed rack open up the rear panel or use a quiet fan for im proved ventilation A Hum is heard in your speakers This problem is more than likely caused by a ground loop in your sys tem rather than a fault in the amplifier Follow these steps to isolate the main cause of the hum there may even be more than one e Remember to turn off all components in your system including the amplifier before disconnecting or connecting any cables e Disconnect all cables which come from outside the room and check if the hum goes away This includes such connections as cable TV satellite TV or roof top an tennas Make sure that they are disconnected where they first enter the room so they are making no connection to the preamplifier or the TV or any other component If the hum is caused by the cable TV line then you will need a ground loop isolator This is an inexpensive device fitted in line with the coaxial cable feed Contact your cable company or your Sunfire Dealer for assis tance
8. manual for this specification An alternative connection method is to have one amplifier running the two woofers and the other running the two tweeters This is useful if your am plifiers have different power ratings Use the more powerful amplifier to run the woofers BALANCED RIGHT WOOFER 10 Sunfire Corporation Symphonic Referenc Power Amplifi RIGHT TWEETER ACTIVE EXTERNAL CROSSOVER HIGH Low TO SECOND AMPLIFIER Sunfire User s Manual APPENDIX Series and Parallel speaker connections The connection of more than one speaker per channel will tend to degrade the speaker s frequency response and may make the amplifier run hot For the best results use one speaker per channel Parallel For example if you want to paral lel connect two speakers to the front right channel of the amplifier e Ideally the total average impedance should be no less than 2 ohms per channel You must make sure that the If you do want to connect more t eee than one speaker per channel there heat eut ss blow theilige are two main ways Series or Parallel i ETY fuse or pop your circuit break Amplifier er If this happens you should Series Outputs reduce the number of speakers For example if you want to wired in parallel rewire them in series connect two speakers to the series or use more
9. this input The input impedance of the 12 V trigger input is approximately 600Q 20 mA 12 V gt USE amp ANY B re 12VDC TO TURN ON 7 Sunfire User s Manual System Configurations The following diagrams show some typical connections that you might make in your installation They show how the inputs and outputs of the Sunfire Amplifier are connected to your preamplifier and speakers Connections to the Sunfire Symphonic Reference Preamplifier Sunfire Corporation 5 SROUND High Fidelity Ge Reference TO Ret WAI Do NoT ESSR CS ie NPMENT TO RAIN GUS SHOCK IN OF IS a e er aun abe E QIIIA AN HIGH Pass SS UEDA END MID DD TUNER aux A R Aux MAN HGH Pass Line level audio signals From Preamplifier main outputs To Amplifier line level inputs Sunfire Orporation Symphonic Referen ower Amp Doimiy 208 CARVER 12 VDC Trigger voltage From Preamplifier 12 VDC trigger outputs To Amplifier 12 VDC trigger inputs The amplifier s line level audio in puts can be connected to the Sunfire Symphonic Reference Preamplifier as shown The amplifier will boost the preamplifier s output up to a level SPEAKER suitable for driving speakers LEFT SPEAKER The 12 VDC connection shown Speaker level audio outputs From Amplifier outputs To Speaker input posts can be used to t
10. age is removed or after ap proximately 20 minutes in the absence of an audio signal SH CHAPTER 1 Symphonic Reference C Sunfire Load Invariant High Fidelity Stereo Power Amplifier LEFT RIGHT CHANNEL CHANNEL NORMAL USE EITHER BALANCED WARNING F HAZARDOUS ENERGY MAKE PROPER SPEAKER Sunfire Corporation Symphonic Reference Power Amplifier Designed by BOB CARVER AVERTISSEMENT ENERGIE ELECTRIQUE INPUTS TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE In the ALWAYS ON up posi tion the amplifier is always on regardless of input signals or 12 VDC trigger In the ALWAYS OFF down position the amplifier is always off regardless of input signals or 12 VDC trigger 2 12 VDC Trigger Input Although the signal sensing turn on is adequate for most installations the 12 VDC trigger inputs are offered as an optional way to turn on the amplifier The Sunfire Symphonic Refer ence Preamplifier has a compatible 12 VDC trigger output When the pream plifier is turned on the amplifier will also turn on 1 8 mono mini jacks are provided for ease of installation along with a terminal strip to allow more flexibility for custom wired installations The terminal strip and both the 1 8 mini jacks are connected in parallel allow ing daisy chaining to turn
11. ffers the following Warranty to you the owner of a new Sunfire product The Sunfire Corporation Warranty for the Symphonic Reference Ampli fier is in effect for FIVE years from the date of original retail purchase The Sunfire Corporation Warranty covers defects in materials and workmanship The following however are excluded a Damage caused during ship ment b Damage caused by accident misuse abuse of operation contrary to the instructions specified in the Sunfire Corpo ration user s manual c Units where the serial number has been defaced modified or removed d Damage resulting from modi fication or attempted repair by any person not authorized in writing by Sunfire Corporation e Units purchased from unau thorized dealers The Sunfire Corporation War ranty extends to the original owner or subsequent owner s during the five year warranty period so long as the original dated purchase receipt is presented whenever warranty service is required All implied warranties including warranties or merchantability and fitness for particular purposes are lim ited in duration to the two year length of this Warranty unless otherwise provided by state law Sunfire Corporation s liability is limited to the repair or replacement at our option of any defective prod uct and shall not in any event include property or any other incidental or consequential damages which may result from the failure of thi
12. he ven tilation slots on the bottom or sides Do not place a preamplifier directly on top of the power amplifier e Protect it from prolonged exposure to direct sunlight and other direct sources of heat such as heating vents and radiators e Do not expose the unit to rain or moisture If fluid or a for eign object should enter the unit immediately turn off the power and contact your Sunfire Dealer e Avoid excessive exposure to extreme cold or dust e Do not place heavy objects on top of the unit AC Power Considerations Ensure that the unit is plugged into an outlet capable of supplying the correct voltage specified for your model The outlet should be capable of supplying 15 amps at 120V Care If you need to clean the front surface first turn unplug the power cord from the AC supply and then use a dry cloth rubbing with the grain Be careful not to scratch the finish Avoid strong cleaning agents Connection Tips Before setting up your new sys tem please consider the following A Always make sure that your components are all turned OFF or unplugged before making or changing any connections Make sure that the power cords of all your components are attached to the same outlet or at least to the same circuit This will reduce the possibility of a ground loop in the system Make sure that the total current draw does not exceed the cur rent rating of the outlet Use the XLR i
13. ing your components further away from the TV espe cially if you ever notice the screen has changed color in the area closest to the compo nent e If you have very high efficiency speakers these may show up noise which other speakers may not Poor bass performance e Make sure that your preamp does not have the bass level turned down e Many surround preamplifiers have controls which can direct all the bass to subwoofers or let your main speakers play the full range Make sure that the preamplifier has been correctly set e Check that the speaker wires have been connected correctly Make sure that the positive of each speaker connects to a positive output of the ampli fier and the negative of each speaker connects to a neg ative output If one speaker is wired incorrectly than it will be out of phase with the others resulting in poor bass perfor mance e If you have connected the amplifier using the XLR inputs make sure that the XLR cables are wired correctly If one has the hot and cold reversed then this will also cause a speaker to be out of phase Turn on and turn off thumps e Plug the amplifier into an unswitched AC outlet and use the AUTO ON feature This will allow the amplifier to turn on and off with good manners 13 Sunfire User s Manual _____ Specifications Power output 250 watts continuous per channel all channels driven into eight ohms from 20 Hz to 20
14. kHz with no more than 0 5 T H D Power at clipping minimum 500 watts per channel into four ohms Hum and Noise 115 dB A Weighted Maximum output current 80 amperes peak to peak per channel Maximum output voltage 45 Vrms Input impedance RCA inputs 24 KQ Input sensitivity for rated output Unbalanced 1 6 Vrms Balanced 0 8 Vrms Input impedance XLR input 24 kQ each leg balanced to ground Female XLR Pin 1 ground Pin2 positive hot C Pin3 negative cold 2 12 VDC Trigger Inputs Input voltage range 5 VDC 18 VDC Input impedance Approximately 600 Q 20 mA at 12 V Removable terminal block Dual 1 8 minijacks for daisy chaining 14 Power Consumption 45 W at idle 200 W typical 1 8th power 1800 W absolute maximum fuse limit Dimensions 17 0 inches wide 5 75 inches high with feet 16 5 inches deep to tips of connectors Weight 30 Ibs Finish Brushed aluminum and black anodize 2002 Sunfire Corporation All rights reserved Sunfire Corpora tion reserves the right to improve its products at any time Therefore specifications are subject to change without notice Manual part number 913 047 00 RevA gt SiNi User s Manual Limited Warranty Sunfire Corporation is proud of its products which have been built with care using advanced technology and premium component parts Your unit has been crafted to perform properly for many years Sunfire Corporation o
15. lla tion of your amplifier Chapter 2 shows some typical con nections to a preamplifier and speakers The Appendix shows some addition al information including a trouble shooting guide the Warranty and service assistance details To find out more about this and other Sunfire products please visit our website www sunfire com 3 Sunfire User s Manual __ Introduction Dear Friend Thank you for purchasing my Sunfire Symphonic Reference Amplifier hope that you enjoy it and the music it makes as much as have enjoyed creating it for you fob Ce 4 Unpacking Your Sunfire Amplifier should reach you in perfect condition If you do notice any shipping damage please contact your Sunfire Dealer immediately Gently lift out the unit and remove all the packing material and acces sories It is important to save all the packing materials and the box in case your amplifier ever needs to be moved or shipped for repair Make sure that you keep your sales receipt It is the only way to establish the duration of your Limited Warranty and it may come in useful for insurance purposes Please take a moment to fill out and mail the Sunfire Customer Response card Also read the serial number located on the rear panel and record it here Serial Purchased at Features e Two channel Power Amplifier in a 17 wide chassis e 250 watts per channel into 8 ohms e
16. nputs if your preamplifier has XLR outputs These balanced connections provide superior noise rejec tion Whenever possible route the power cords away from the signal cables or speaker wires to prevent any hum or inter ference heard in the speakers Choose reliable hookup cables They should be fully shielded and as short as possible Some patch cords can be a very tight fit and there is usu ally a preferred method of get ting them off Some have to be removed with a twisting action Be gentle or you may damage the jacks of your amplifier or other components Some audiophile cables should be hooked up in one direction these are usually marked with arrows It is usual for the right channel patch cord plugs to be red and the left channel connections to be white grey or black ESF CHAPTER 1 12 VDC Trigger If you have a Symphonic Refer ence Preamplifier it has a Trigger terminal which supplies 12 VDC whenever the preamplifier is turned on This voltage can be used to turn on the amplifier Use all standard safety precautions and make sure all the equipment is discon nected before making any connections Any 1 8 mono to mono two wire interconnect cable will suffice to con nect the 12 V trigger output from the preamplifier to the amplifier The voltage range for the ampli fier s trigger input is 5 to 18 Volts DC Do not exceed 18 Volts on this input CAUTION Do not connect AC line voltage to
17. on multiple amplifiers continued 5 Sunfire User s Manual ___ CHAPTER 1 H Rear Panel Features continued ALWAYS ON AUTO ON ALWAYS OFF AD AUTO SENSE RIGHT CHANNEL USE EITHER amp 12VDC TO TURN ON BALANCED Built under one or more of the following patents 4 218 660 4 484 150 5 748 753 3 RCA Unbalanced Inputs Your Sunfire Amplifier has three sets of inputs for each channel Two are unbalanced RCA inputs and one is a balanced XLR type The two RCA inputs for each channel are joined together internally and either one can be connected to the corresponding output of your preamplifier The other can be used as a daisy chaining output sending the preamplifier output signal to another channel or to another amplifier Note that signals cannot pass from the RCA into the XLR inputs Do not drive the amplifier from more than one preamplifier or other source RIGHT CHANNEL CHANNEL USE EITHER BALANCED AVERTISSEMENT G Sunfire Corporation Symphonic Reference Power Amplifier Designed by BOB CARVER 15 AMP MDA15 AC INPUT LEFT CHANNEL A Nu OUTPUTS ENERGIE ELECTRIQUE WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK D NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE 4 XLR Balanced Inputs If your preamplifier has XLR out puts connect them to the XLR inputs The female XLR inputs are wired as follows
18. pedance is lower compared to driving a single speaker and the amplifier must produce more current to drive them 11 Sunfire User s Manual APPENDIX Troubleshooting Guide The Sunfire Amplifier is expertly designed and built to provide years of trouble free performance Most prob lems that occur can usually be solved by checking your setup or making sure that the audio and video compo nents connected to the processor are on and fully operational The following information will help you deal with common setup problems you may experience during normal use of your unit If the problems still persist please contact your Sunfire Dealer for assistance No sound from one or more speakers e Speaker cables may have come undone Turn off your system and check the cables and tighten the amplifier and speaker binding posts e Broken audio cable e The preamplifier balance level is low for the channel con cerned e The preamplifier Mute switch is on or an external processor loop or a tape monitor loop is engaged The amplifier shuts down often or the line fuse blows often e Check that the positive and nega tive speaker wires are not shorted together e Make sure that no speakers are shorted internally If you have an ohm meter disconnect the speaker wires and measure the resistance between the speaker s positive and negative terminals If the read ing is less than 2 ohms the speak ers may
19. s product Some states do not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above limitations or exclusions may not apply to you This Warranty gives you specific legal rights and you may also have other rights which vary from state to state We suggest that you attach your purchase receipt to this Warranty and keep these in a safe place Thank you for your choice of a Sunfire Corpo ration product APPENDIX Service Assistance We suggest that you read the Limited Warranty completely to fully under stand your Warranty Service cover age If your Sunfire Corporation prod uct ever requires service write to us or call Sunfire Corporation Technical Services Department P O Box 1589 Snohomish WA 98291 Tel 425 335 4748 Fax 425 335 4746 You will be directed to an autho rized Sunfire Corporation Service Station or receive instructions to ship the unit to the factory Please save the original shipping carton and packing materials in case shipping is required Please do not ship Parcel Post NOTE Before sending in your unit for repair you must call Sunfire for return authorization Include a complete description of the problem indicating how you have it connected the associated equipment in your system and a copy of your purchase receipt Initial shipping costs are not paid by Sunfire Corporation
20. t should be serviced only by qualified service personnel when A The power supply cord or the plug has been damaged or B Objects have fallen or liquid has spilled into the Component or C The Component has been exposed to rain or D The Component does not appear to operate normally or exhibits a marked change in perfor mance or E The Component has been dropped or its cabinet damaged 14 Servicing The user should not attempt to service the Component beyond those means described in this operating manual All other servicing should be referred to qualified service personnel PORTABLE CART WARNING Carts and stands The Component should be used only with a cart or stand that is recommended by the manufacturer A Component and cart combination should be moved with care Quick stops excessive force and uneven surfaces may cause the Component and cart combination to overturn Sunfire User s Manual 15 To prevent electric shock do not use this polarized plug with an exten sion cord receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure Pour pr evenir les chocs lectriques ne pas utiliser cette fiche polarise avec un prolongateur un prise de courant ou une autre sortie de cou rant sauf si les lames peuvent tre ins r es a fond sans laisser aucune parllle d couvert 16 Grounding or Polarization Precautions should be taken so that the
21. than one front right channel of the amplifier power amplifier _ _ e The positive output terminal of 7 the right channel connects to ss T the positive input post of the HUE first speaker and to the positive post of the second speaker The positive output terminal of the right channel connects to the positive input post of the first speaker The negative input post of the first speaker connects to the positive input post of the sec ond speaker The negative input post of the second speaker connects to the negative output terminal of the right channel The total impedance of speak ers in series is found by adding their impedances together For example two four ohm speak ers in series is an eight ohm load Series connections are easier on the amplifier than parallel connections as the total imped ance is higher than driving a single speaker The negative output terminal of the right channel connects to the negative input post of the first speaker and to the negative post of the second speaker The total impedance of equal speakers in parallel is found by dividing the impedance of one speaker by the number of speakers For example two eight ohm speakers in parallel is a four ohm load eight ohms divided by two four eight ohm speakers in parallel is a two ohm load eight ohms divided by four Parallel connections are harder on the amplifier than series connections as the total im
22. uld be situated away from heat sources such as radiators or other devices which produce heat 2 8 Power Sources The Component should be connected to a power sup ply only of the type described in these operation instructions or as marked on the Component 9 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 particular at tention to cords at plugs convenience receptacles and the point where they exit the Component 10 Cleaning The Compo nent should be cleaned only as recommended in this manual 11 Non use Periods The power cord of the Component should be un plugged from the outlet when unused for a long period of time 12 Object and Liquid Entry Care should be taken so that objects do not fall into and liquids are not spilled into the inside of the Component The lightning flash with 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 of the presence of important operating and main tenance servicing instructions in the literature accompanying the appliance 13 Damage Requiring Service The Componen
23. urn the amplifier on when the preamplifier turns on Alter natively you could use the amplifier s AUTO ON switch The amplifier will then automatically turn on when a preamp signal is received Sunfire User s Manual Balanced Connections Balanced line level audio signals BAL AR AMPLIFIER From Preamplifier XLR outputs ANCED OUTPUTS To Amplifier XLR inputs RIGHT LEFT RIGHT re PEAKER L EFT SPEAKER If your preamplifier has XLR bal anced outputs it can be connected to the amplifiers XLR inputs as shown Speaker level audio outputs From Amplifier outputs To Speaker input posts 9 Sunfire User s Manual __ Biamping connections If your speakers can be biamped they will have separate input posts for the woofer and the tweeter sections This diagram shows how to cre ate a very efficient system with an active external crossover The cross over will split the incoming preamp signal into two frequency ranges one above and one below the crossover frequency True biamping is very efficient because each amplifier channel only receives and amplifies the range required for its driver For example in the diagram below the right channel only amplifies the low frequencies and the left channel only amplifies the high frequencies Make sure that you adjust the crossover frequency to suit your PREAMPLIFIER BALANCED OUTPUTS LEFT speaker s crossover point Check the speaker owner s
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