NAD C 275BEE audio amplifier
Contents
1. D a of _ Rot L N MaN MaN INPUT SENSE MONO BRIDGE MODE SOFT_CLIPPING OFF AUTO 0O orr 0 Jon ore D Jon o STEREO mono Co LEFTCH Co i aea Q SPEAKERS A M a r SPEAKERS B ATTENTION Please make sure that the C 275BEE is powered OFF or unplugged before making any connections It is also advisable to power down or unplug all associated components while making or breaking any signal or AC power connections INPUT SELECT Slide this switch to either FIX or VAR When it is set to FIX the input signal is taken straight to the power amplifier s circuitry This setting is normally used in a system with only one power amplifier or multiple but identical power amplifiers When the INPUT SELECT switch is set to VAR Variable it is possible o adjust the volume level for both channels simultaneously using the NPUT LEVEL CONTROL This can be useful for Level Matching n a surround sound or system with more than one set of speakers differences in levels can occur due to variance inefficiencies between hese speakers In case your preamplifier or processor also has individual trims for each channel set these to neutral or mid position usually marked as OdB Adjust the INPUT LEVEL CONTROL so that he speakers driven by the C 275BEE have the correct volume level compared to the other speakers judging from your listening position Extended Volume Control Ra2. SERVICE V ENTRANCE CONDUCTORS STAND OFF INSULATORS gt MAST lt ANTENNA SERVICE ENTRANCE LUcrouno crampes LEAD IN WIRE baie ld A GROUND WIRE gt 4 ANTENNA _ UFR ae DISCHARGE s 2 UNIT POWER SERVICE ELECTRODE SYS e g interior motal water pipe BONDING JUMPER GROUNDING Ro he V AREND T EXTERNAL ANTENNA GROUNO TERMINALS CLAMPS OF PRODUCT OPTIONAL ANTENNA GROUND ING ELECTRODE DRIVEN 8 FEET 2 44M INTO IF REQUIRED BY THE EARTH IF LOCAL CODES SEE NEC SECTION 810 21 f 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 When installing an outside antenna system extreme care should be taken to keep from touching such power lines or circuits as contact with them 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 ma
3. 10 mV at 1 kHz lt 10 minutes 312 W ref 230V AC 50 Hz 120V AC 60 Hz lt 1W lt 100 W 435 x 133 x 352 mm Net 435 x 150 x 396 mm Gross 14 6 kg 16 9 kg Gross dimensions include feet front panel button and extended speaker terminals Specifications are subject to change without notice For updated documentation and features please log onto www NADelectronics com for the latest information about the C 275BEE 11 www NADelectronics com 2008 NAD ELECTRONICS INTERNATIONAL A DIVISION OF LENBROOK INDUSTRIES LIMITED All rights reserved No part of this publication may be reproduced stored or transmitted in any form without the written permission of NAD Electronics International C 275BEE Manual Issue 2 11 08
4. INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL The equipment draws its nominal non operational power from the AC outlet with its POWER switch in the STANDBY position The socket outlet shall be installed near the apparatus and shall be easily accessible CAUTION Changes or modifications to this equipment not expressly approved by NAD Electronics for compliance could void the user s authority to operate this equipment CAUTION REGARDING PLACEMENT To maintain proper ventilation be sure to leave a space around the unit from the largest outer dimensions including projections that is equal to or greater than shown below Left and Right Panels 10 cm Rear Panel 10 cm Top Panel 50 cm IMPORTANT SAFETY INSTRUCTIONS NOTES ON ENVIRONMENTAL PROTECTION At the end of its useful life this product must not be disposed ae of with regular household waste but must be returned to a collection point for the recycling of electrical and electronic a equipment The symbol on the product user s manual and packaging point this out The materials can be reused in accordance with their markings Through re use recycling of raw materials or other forms of recycling of old products you are making an important contribution to the protection of our environment Your local administrative office can advise you of the responsible waste disposal point INFORMATION ABOUT COLLECTION AND DISPOSAL OF WASTE BATTERIES DIRECTIVE 2006 66 EC
5. all of the packaging in which your C 275BEE arrived Should you move or otherwise need to transport your receiver this is by far the safest container in which to do so We ve seen too many otherwise perfect components damaged in transit for lack of a proper shipping carton so please Save that box NOTES ON INSTALLATION Your NAD C 275BEE should be placed on a firm level surface Avoid placing the unit in direct sunlight or near sources of heat and damp Allow adequate ventilation Do not place the unit on a soft surface like a carpet Do not place it in an enclosed position such a bookcase or cabinet that may impede the air flow through the ventilation slots Make sure the unit is switched off before making any connections The RCA sockets on your NAD C 275BEE are colour coded for convenience Red and white are Right and Left audio respectively Use high quality leads and sockets for optimum performance and reliability Ensure that leads and sockets are not damaged in any way and all sockets are firmly pushed home For best performance use quality speaker leads of 16 gauge 1 5mm hickness or more If the unit is not going to be used for some time disconnect the plug from the AC socket Should water get into your NAD C 275BEE shut off the power to the unit and remove the plug from the AC socket Have the unit inspected by a qualified service technician before attempting to use it again DO NOT REMOVE THE COVER THERE ARE NO USER SE
6. setting for the C 275BEE to be normally switched ON or back to standby mode using the front panel STANDBY button 12V TRIGGER INPUT The 12V Trigger input allows the C 275BEE to be switched remotely from standby mode to ON and vice versa by ancillary equipments such as a preamplifier AV processor etc The controlling device must be equipped with a 12V trigger output to use this feature Refer also to the section above about 12V TRIGGER IN INPUT SENSE OFF AUTO FUSE HOLDER In the unlikely event a fuse may need to be replaced unplug the AC cord from the wall Then remove all connections from the amplifier Use a flathead screw driver or similar to open the fuse holder via the slot indicated With the screw driver in place push and turn counterclockwise to open the fuse holder Only replace the fuse with the same type size and specification T10AL 250V for 120V version or T5AL 250V for 230V version IMPORTANT NOTICE Do not use any substitute fuses of different types or with different ratings or values Failure to observe this precaution may cause damage to the amplifier circuits and may create a fire hazard and or defeat the safety built into the amplifier and may void the warranty SPEAKERS A B The C 275BEE is equipped with two sets of speaker connectors Use the Speakers A terminals for the main speakers and use the Speakers B terminals for a second pair for example extension speakers located in another room
7. C 275BEE Stereo Power Amplifier Owner s Manual IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS FOR LATER USE FOLLOW ALL WARNINGS AND INSTRUCTIONS MARKED ON THE AUDIO EQUIPMENT 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 Use a damp cloth for cleaning 6 Attachments Do not use attachments not recommended by the product manufacturer as they may cause hazards 7 Water and Moisture Do not use this product near water for example near a bath tub wash bowl kitchen sink or 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 acces
8. Connect the right speaker to the terminals marked R and R ensuring that the R is connected to the terminal on your loudspeaker and the R is connected to the loudspeaker s terminal Connect the terminals marked L and L to the left speaker in the same way In Bridge R and L ensuring that the L is connected to the terminal ode connect the single speaker to the terminals marked un on your loudspeaker and the R is connected to the loudspeaker s terminal Refer also to the section above about BRIDGE MODE Always use heavy duty 16 gauge 1 5mm or thicker stranded wire to connect loudspeakers to your NAD C 275BEE The high current binding post terminals can be used as a screw terminal for cables terminating in spade or pin sockets or for cables with bare wire ends 10 AC MAINS INPUT The C 275BEE comes supplied with a separate AC Mains 1 cable Before connecting the cable to a live wall socket ensure that it is firmly connected to the C 275BEE s AC Mains input socket first Connect only to the prescribed AC Outlet i e 120V 60 Hz or 230V 50 Hz Always disconnect the AC Mains cable plug from the live wall socket first before disconnecting the cable from the C 275BEE s Mains input socket POWER SWITCH The POWER switch supplies the master AC mains power for the C 275BEE Refer to the ATO LOGIC chart below for a better understanding of the role of the POWER switc
9. OF THE EUROPEAN PARLIAMENT AND THE COUNCIL OF EUROPEAN UNION FOR EUROPEAN CUSTOMERS ONLY Batteries bearing any of these symbols indicate that they should be treated as separate collection and not as municipal waste It is encouraged that Pb necessary measures are implemented to maximize the separate collection of waste batteries and to minimize the disposal of batteries as mixed municipal waste Hg Cd End users are exhorted not to dispose waste batteries as unsorted municipal waste In order to achieve a high level of recycling waste batteries discard waste batteries separately and properly through an accessible collection point in your vicinity For more information about collection and recycling of waste batteries please contact your local municipality your waste disposal service or the point of sale where you purchased the items By ensuring compliance and conformance to proper disposal of waste batteries potential hazardous effects on human health is prevented and the negative impact of batteries and waste batteries on the environment is minimized thus contributing to the protection preservation and quality improvement of the environment NOTE THE C 275BEE IS NOT AN AUTO VOLTAGE POWER AMPLIFIER CONNECT ONLY TO THE PRESCRIBED AC OUTLET I E 120V 60HZ OR 230V 50HZ RECORD YOUR MODEL NUMBER NOW WHILE YOU CAN SEE IT The model and serial number of your new C 275BEE are located on the back of the cabinet For y
10. R IN POWER switch ON 12V TRIGGER IN POWER switch ON 12 TRIGGER IN POWER switch ON 12V TRIGGER IN POWER switch ON 12 TRIGGER IN POWER switch ON N N N N N nm NPUT SENSE Sense OFF nm NPUT SENSE Sense OFF mn NPUT SENSE Sense OFF mn NPUT SENSE Sense OFF nm NPUT SENSE Sense OFF NPUT SENSE Sense OFF NPUT SENSE Sense OFF NPUT SENSE Sense OFF NPUT SENSE Sense OFF NPUT SENSE Sense OFF 12V TRIGGER POWER switch 0 12V TRIGGER POWER switch 0 12V TRIGGER POWER switch 0 12V TRIGGER POWER switch 0 12V TRIGGER POWER switch 0 12V TRIGGER NPUT SENSE Sense OFF NPUT SENSE Sense AUTO NPUT SENSE Sense AUTO NPUT SENSE Sense AUTO NPUT SENSE Sense AUTO NPUT SENSE Sense AUTO NOTE If the 12V TRIGGER IN INPUT SENSE switch is set to OFF the presence or absence of 12V trigger input or any input signal at the INPUT sockets will not have any effect on the C 275BEE effectively defeating both features POWERDRIVE The C 275BEE uses NAD s proprietary PowerDrive amplifier technology for all channels to preserve accurate linear reproduction regardless of the loudspeaker This uniquely efficient power supply topology provides the real world benefits of high dynamic power that remains uncompromised by low impedance speakers By adding a second high voltage rail to our well regulated high current powe
11. RVICEABLE PARTS INSIDE Use a dry soft cloth to clean the unit If necessary lightly dampen the cloth with soapy water Do not use solutions containing benzol or other volatile agents INTRODUCTION GETTING STARTED BARE WIRES AND PIN CONNECTORS WARNING The terminals marked with this symbol are hazardous live External wiring connected to these terminals requires installation by an instructed person or the use of ready made leads or cords Bare wires and pin sockets should be inserted into the hole in the shaft of the terminal Unscrew the speaker terminal s plastic bushing until the hole in the screw shaft is revealed Insert the pin or bare cable end into the hole and secure the cable by tightening down the terminal s bushing Ensure bare wire from the speaker cables does not touch the back panel or another socket Ensure that there is only 1 2 1cm of bare cable or pin and no loose strands of speakers wire IDENTIFICATION OF CONTROLS FRONT PANEL Stereo Pc er Amplifier C 275BEE BRIDGE SOFT MODE CLIPPING a c Mhie NAD C 275BEE 1 STANDBY BUTTON Press this button to switch ON the C 275BEE 3 BRIDGE MODE INDICATOR This BRIDGE MODE indicator lights up The Standby LED indicator will turn from amber to blue Pressing the blue when the C 275BEE is switched to Bridge Mode Refer also to the STANDBY button again turns the unit back to standby mode item below about BRIDGE MODE at
12. h when switching ON or OFF the C 275BEE If you intend not to use the C 275BEE for long periods of time such as when on vacation switch the POWER switch to the OFF position AUTOMATED TURN ON LOGIC ATO LOGIC The C 275BEE may be turned ON in any one of three discrete ways for complete system flexibility from the front panel standby button the 12V TRIGGER circuit or by the input signal sensing circuit The ON OFF power control is managed by the Automated Turn On logic or ATO Logic circuit that requires the C 275BEE to be switched back to standby mode in ATO LOGIC CHART IDENTIFICATION OF CONTROLS REAR PANEL the same manner by which it was activated In other words if the C 275BEE is switched ON via a 12V control signal it cannot be switched to standby mode via the front panel STANDBY button it must wait for removal of the 12V control signal In practice you probably would use only one of the methods once your C 275BEE is installed 12V TRIGGER IN POWER SWITCH STANDBY BUTTON Power Power Standby Mode ON OFF amber blue using 3 5mm mini jack plug MRSE Switch ON Mini jack Input signal Input signal wN w unplugged gt 20mV lt 20mV CONDITION POWER switch OFF 12V TRIGGER IN INPUT SENSE Sense OFF POWER switch OF 12V TRIGGER IN POWER switch OF 12V TRIGGER IN POWER switch OF 12V TRIGGER IN POWER switch OF 12 TRIGGER IN POWER switch OF 12 TRIGGER IN POWER switch ON 12V TRIGGE
13. impedance speakers under 8 ohms are not recommended when using Bridge Mode as these may cause the amplifier s thermal cut out to operate if played at high levels Set the BRIDGE MODE switch to the ON position and connect the speaker to the terminals marked L and R ensuring that the L is connected to the terminal of your loudspeaker and the R is connected to the loudspeaker s the INPUT sockets terminal Connect the source to The BRIDGE MODE indicator on the front panel will illuminate when the C 275BEE is in Bridge mode NOTE Do not connect anything to the Right Input socket when Bridge Mode is selected SOFT CLIPPING Enables NAD s proprietary Soft Clipping circuitry on all channels At ON position Soft Clipping gently limits the output of the C 275BEE to minimize audible distortion should the amplifier be over driven Soft Clipping may simply be left ON at all times to reduce the likelihood of audible distortion from excessive volume settings However for critical listening and to preserve optimum dynamics you may wish to defeat it by setting this switch to OFF position The SOFT CLIPPING indicator on the front panel will illuminate when the amplifier is in Soft Clipping mode 12V TRIGGER IN INPUT SENSE OFF AUTO This dual function switch alternates between sensing a 12V input as applied through the 12V trigger IN jack item 7 below or sensing any input signal a
14. l part Unauthorized substitutions may result in fire electric shock or other hazards 21 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 22 Wall or Ceiling Mounting The product should be mounted to a wall or ceiling only as recommended by the manufacturer 23 Heat The product should be situated away from heat sources such as radiators heat registers stoves or other products including amplifiers that produce heat WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT FULLY INSERT IMPORTANT SAFETY INSTRUCTIONS 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 MAYBE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK TO PERSONS THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE USERTO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE SERVICING INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE 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
15. nge Many systems have so much voltage gain that the speakers or your ears are overdriven at any volume control setting higher than 11 or 12 oclock As a result you are confined to using only the lower half of the volume control s range where adjustments are imprecise and where channel balance errors tend to be greater If the input level is reduced you can turn up the volume control of your processor or preamplifier making more effective use of its range Suggestion adjust the input level controls so that your preferred maximum sound levels usually occur at about 2 or 3 o clock on the volume control As an added benefit this procedure suppresses any noise produced by the preamplifier s high level circuitry e g any residual hum or hiss that does not go away when the Volume is turned down NO Sooo o o e 6 7 8 A u Bi Amping Some loudspeakers have separate connection terminals for their LF Low Frequency and HF High Frequency sections Where a separate power amplifier is used for the LF and HF section this facility allows to Bi Amp such speakers which may improve overall sound quality When Bi Amping with different models of power amplifiers it is likely to occur that one power amplifier has more gain than the other resulting in a mismatch in level for the woofer and tweeter of the speaker Adjust the level control so that woofer and tweeter are in perfect balance with each other identical gain of power amplifie
16. o the correct level Check connections and speakers Check leads and connections Check connections to all speakers in the system Switch C 275BEE OFF and check speaker cable connections for both speaker terminals at the rear panel OVERALL SPECIFICATIONS FIXED IN SPEAKER OUT Continuous output power into 8 Q and 4 Q both channels driven Continuous output power into 8 Q Mono Bridge mode Rated THD 250 mW to rated power CCIF IMD DIM 100 Clipping power 4 Q and 8 O IHF dynamic power 8 Q 40 20 IHF dynamic power Bridge mode 8 Q 40 Peak output current Signal Noise ratio Damping factor Frequency response Input impedance Fixed IN Input impedance Variable IN Input sensitivity Voltage gain Minimum input level for AUTO TRIGGER Time to power OFF at no signal in AUTO mode POWER CONSUMPTION Normal operation Standby power dle power DIMENSION AND WEIGHT Dimensions W x H x D Net weight Shipping weight REFERENCE SPECIFICATIONS gt 150 W ref rated THD 20 Hz 20 kHz gt 330 W ref 20 Hz 20 kHz lt 0 02 THD lt 0 008 ref 20 Hz 20 kHz gt 170 W ref 1 KHz 1 THD 250 W 410W 600 W 800 W 1200 W gt 50 A ref 1 Q 1 ms gt 102 dB A weighted ref 1 W gt 123 dB A weighted ref 150 W gt 180 ref 8 Q 50 Hz and 1 kHz 0 1 dB ref 20 Hz 20 kHz 3 Hz 100 kHz ref 3 dB 10 KQ 200 pF 100 kQ 100 pF 1 2V ref rated power 29 dB
17. our future convenience we suggest that you record these numbers here NAD is a trademark of NAD Electronics International a division of Lenbrook Industries Limited Copyright 2008 NAD Electronics International a division of Lenbrook Industries Limited QUICK START In case you simply cannot wait to experience the performance of your new NAD C 275BEE Stereo Power Amplifier we provide the following QUICKSTART instructions to get you underway Please make all the connections to your C 275BEE with the unit unplugged It is also advisable to power down or unplug all associated components while making or breaking any signal or AC power connections 1 Connect your speakers to the SPEAKER A terminals of C 275BEE 2 Connect your Preamplifiers PRE OUT to the C 275BEE rear panel s INPUT port 3 Make sure to set the following conditions your Preamplifier s volume level set to minimum C 275BEE s 12V Trigger IN switch set to OFF position and INPUT SELECT switch at FIX position 4 Connect the AC cord to the C 275BEE s AC Mains input and then plug into an AC outlet 5 Switch the POWER switch on the rear panel to the ON setting in order to turn the C 275BEE to standby mode The Standby LED indicator embedded around the bezel of the STANDBY button will illuminate amber 6 Press the STANDBY button to turn ON the C 275BEE The Standby LED indicator will turn from amber to blue SAVE THE PACKAGING Please save the box and
18. pplied at the INPUT sockets At AUTO setting and with the 12V trigger input of the C 275BEE connected to the DC output jack of a compatible auxiliary component the C 275BEE can be switched remotely from standby mode to ON and vice versa Use a 3 5mm mini jack to pass 12V from the auxiliary equipment into the C 275BEE If there is no 3 5mm mini jack inserted at the 12V Trigger IN jack and with the switch still at AUTO setting the C 275BEE will instantaneously turn ON from standby state if it senses any input signal approximately above 20mV RMS input applied through the INPUT sockets In the absence of a 12V trigger input or any input signal at the INPUT sockets and with OFF AUTO switch set to AUTO the C 275BEE will switch automatically to standby mode Slide the OFF AUTO switch to OFF setting for the C 275BEE to be normally switched O standby mode using the front panel STANDBY button or back to NOTES Switch the rear panel POWER switch to ON position in order to make use of the 12V Trigger IN or Input Sense AUTO feature as well as the front panel STANDBY button At input sense mode it will take about 10 minutes for the C 275BEE to go to standby mode when the input signal source is turned OFF or go below 20 mV IMPORTANT NOTICE With the rear panel POWER switch at ON position and the OFF AUTO switch at AUTO setting the C 275BEE cannot be switched ON using the front panel STANDBY button Slide the OFF AUTO switch to OFF
19. r supply we get an overdrive that can nearly double the continuous power on a short term dynamic power basis PowerDrive offers greater amplifier stability and low impedance drive capability resulting in less distortion when driving real speakers with real program material REFERENCE TROUBLESHOOTING CONDITION No power C 275BEE always at standby mode cannot be switched ON using the front panel STANDBY button No sound No sound one channel Weak bass diffused stereo image POWER STANDBY LED stays red upon turning POWER ON 10 POSSIBLE CAUSES The power cord is disconnected POWER switch set to OFF position 12V TRIGGER IN INPUT SENSE switch set to AUTO position Power AC lead unplugged or power not switched ON No input signal applied through the INPUT sockets INPUT LEVEL CONTROL turned down Speaker not properly connected or damaged Input lead disconnected or damaged Speakers wired out of phase There is short circuit in the speaker cabling POSSIBLE SOLUTIONS Plug the power cord into the wall outlet securely Set the POWER switch to ON position Slide the 12V TRIGGER IN INPUT SENSE switch to OFF position Check if AC lead is plugged in and POWER switched ON along with the corresponding ATO logic configuration Check that there is active input signal applied through the INPUT sockets Turn INPUT LEVEL CONTROL up t
20. rs TES Always turn OFF the C275BEE and other components in the system before connecting or disconnecting anything to the INPUT sockets When the INPUT SELECT switch is set to VAR for the first time it is advised that the INPUT LEVEL CONTROL level of the C 275BEE or the volume control level of your preamplifier processor be set to their minimum settings This prevents inadvertently beginning a session at excessive volume You can then adjust both controls to your desired listening level INPUT Connect the output from a pre amplifier or processor such as a surround sound decoder to this set of inputs Use a twin RCA to RCA lead to connect the left and right Audio Output of the preamplifier or processor to these input sockets INPUT LEVEL CONTROL The INPUT LEVEL CONTROL works in combination with the VAR Variable input setting Turn clockwise to increase the VAR Variable volume level counter clockwise to lower it IDENTIFICATION OF CONTROLS REAR PANEL 4 BRIDGE MODE The C 275BEE amplifier can be configured to be MONO Bridge Mode more than doubling its output power This way the C 275BEE can be used as part of a high power stereo or home theatre system by connecting additional power amplifiers In BRIDGED MODE an 8 ohm loudspea as though the spea he C 275BEE will produce approximately 330W into er In this mode the amplifier sections will react er impedance has been halved Low
21. rt 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 Do not defeat the safety purpose of the polarized plug 13 Power Cord 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 1 product 14 Outdoor Antenna Grounding f 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 of grounding conductors location of antenna discharge unit connection to grounding electrodes and requirements for the grounding electrode NOTE TO CATV SYSTEM INSTALLER This reminder is provided to call the CATV system installer s attention to Section 820 40 of the NEC which provides guidelines for proper grounding and in particular specifies that the cable ground shall be connected to the grounding system of the building as close to the point of cable entry as practical POWER LINES i T 7
22. sory recommended by the manufacturer A product and cart combination should be moved with care Quick stops 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 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 The primary method of isolating the amplifier from the mains supply is to disconnect the mains plug Ensure that the mains plug remains accessible at all times Unplug the AC power cord from the AC outlet if the unit will not be used for several months or more 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 inse
23. the IDENTIFICATION OF CONTROLS REAR PANEL IMPORTANT NOTICE The rear panel POWER switch must be in the ON position for the 4 SOFT CLIPPING INDICATOR The blue SOFT CLIPPING LED shows STANDBY button to activate that the SOFT CLIPPING mode is engaged Refer also to the item below about SOFT CLIPPING at the IDENTIFICATION OF CONTROLS REAR 2 STANDBY LED This indicator will light up amber when the C 275BEE PANEL is in standby state When the C 275BEE is at ON state this indicator will illuminate blue In cases of serious abuse of the C 275BEE such as excessively low loudspeaker impedance and short circuit the C 275BEE will engage its Protection circuitry indicated by the Standby LED turning from blue to red and the sound being muted In such a case turn the C 275BEE OFF by the rear panel POWER switch wait for it to cool down and or check the speaker connections making sure the overall loudspeaker impedance doesn t go below 4 ohms or 8 ohms in Bridge mode Once the cause for the protection circuitry to engage has been removed switch ON the rear POWER button and the Standby Button to resume normal operation NAD C 275BEE IDENTIFICATION OF CONTROLS REAR PANEL CAUTION ATTENTION MINIMUM SPEAKER IMPEDANCE BRIDGE MODE STEREO MODE MONO ONE PAIR 40 TWO PAIRS 80 Serial No No De Series ONE 80 TWO 160 INPUT LEVEL INPUT eke ata ede MIN MAX py 00 v
24. y touch dangerous voltage points or short out parts that could result in a fire or electric shock Never spill liquid of any kind on the product WARNING THE APPARATUS SHOULD NOT BE EXPOSED TO DRIPPING OR SPLASHING AND OBJECTS FILLED WITH LIQUIDS SUCH AS VASES SHOULD NOT BE PLACED ON THE APPARATUS AS WITH ANY ELECTRONIC PRODUCTS USE CARE NOT TO SPILL LIQUIDS INTO ANY PART OF THE SYSTEM LIQUIDS CAN CAUSE A FAILURE AND OR A FIRE HAZARD 19 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 20 Replacement Parts When replacement parts are required be sure the service technician has used replacement parts specified by the manufacturer or have the same characteristics as the origina
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