B&K AV5125 User's Manual
Contents
1. Double check all connections Connect a playback unit CD VLD Tuner etc to the preamplifier Turn the volume on the preamplifier to minimum Turn on the preamplifier then the amplifier in that order Set source on the preamplifier to the playback unit you ve just connected Turn volume up slowly and music should be heard from all channels If this is not the case double check your installation m Should you encounter any problems that cannot be traced to the source or the material being played consult the TROUBLESHOOTING section on page 10 Note When turning equipment off the amplifier should always be turned off first then the preamplifier When turning equipment on the preamplifier should always be turned on first then the amplifier Before turning anything on ensure the preamplifier is at a low volume level Control muting A control is provided on each AV5125 amplifier to allow remote switching of mute on off The preamplifier s control output such as is provided with B amp K series preamplifiers can be utilized to provide a control signal to the AV5125 If more than one amplifier is being controlled the control signal can be extended to include each successive unit by simply running a 3 5mm mini jack cable from the CTRL OUT connector of the first amplifier to the CTRL IN connector of the next unit commonly referred to as daisy chaining An example of how to connect two amplifiers i2. i Left rear Center Right rear Left front Right front Figure D Page 6 13001 rev 0004 System installation There will most likely be a number of cables involved in the installation of your home entertainment system Pre planning is essential in order to maximize system efficiency We recommend the following as a means of helping you reach that goal Make a diagram of your proposed system by laying out the relative location of each component in the system Then lay out the proposed cable runs between them Number each cable and record its length on the diagram for future reference Cable runs are critical in that they must be kept away from sources of power radiation amplifiers power cords heaters etc For the sake of safety they should also be kept out of traffic areas The process of optimizing the system will include the type of cable the length of the run and the obstructions it must deal with along its run Your dealer can advise you on the products available and their relative merits If building custom length audio cables is not your strength your dealer should be able to help you with that as well H When possible use a separate AC power line for the amplifier one that is not shared by any other component in the system of any other house hold component Tip Take a piece of stout string longer than the longest cable run and mark it at each foot of length Then do a mock cable run using the string dres
3. B amp K in respect of the equipment being returned You may request an RA number by calling B amp K at the numbers below We ask that you provide the following information at that time 1 Your name address and phone number 2 The model and serial number of the equipment being returned 3 A description of the problem being experienced Your call will be referred to a Technical Service Representative who will work with you to resolve the problem If it is determined that the unit must be returned for repair an RA number will be issued B amp K Components Ltd 2100 Old Union Road Buffalo New York 14227 1 800 543 5252 or 1 716 656 0023 Page 12 13001 rev 0004 B amp K Components Ltd 2100 Old Union Road Buffalo New York 14227 13001 rev 0004 B amp K Components Ltd 2100 Old Union Road Buffalo New York 14227 716 656 0023 www bkcomp com LIST YOUR UNIT INFORMATION HERE MODEL AV5125 SERIAL DEALER NAME DEALER PHONE SALES PERSON DATE PURCHASED 13001 rev 0004
4. the top cover You may clean the connectors on the back panel with isopropyl alcohol annually Page 10 13001 rev 0004 AV5125 SPECIFICATIONS Power rating 8 ohms 4 ohms Frequency response Input sensitivity THD S N Input impedance Damping factor Current peak to peak Slew rate Dynamic headroom S N A weighted Voltage gain Line voltage Dimensions O A Weight Power consumption Replacement fuses Page 11 125 watts 1 kHz 185 watts 1 kHz 5 Hz 45 kHz 1 0 Volts 0 09 1 kHz 33 2 k ohms 150 30 Amps 14 V usec 1 4 dB 95 dB 28 120 220 240 VAC switchable 17 w X 16 d X 5 75 h 43 Ib 1220 watts max 12 2 Amps max current draw 125 watts no input Line 12 Amp 250 Volt Slow Blow Rails 4 Amp 250 Volt Slow Blow 13001 rev 0004 Limited Warranty B amp K Components Ltd referred to herein as B amp K warrants your B amp K equipment against all defects in material and workmanship for a period of five years from the date of purchase This warranty applies only to the original purchaser and only to equipment in normal residential use and service Defective equipment must be returned to B amp K prepaid accompanied by sufficient payment to cover the cost of return shipping and handling and will be repaired or replaced at the discretion of B amp K whose decision as to the method of reparation will be final This warranty shall not apply to any equipment which is found to have been impro
5. B amp K WE SIMPLY SOUND BETTER AV5125 Five Channel Amplifier OWNER S MANUAL B amp K Components Ltd B amp K Components Ltd 2100 Old Union Road Buffalo New York 14227 13001 rev 0004 Table of contents Safety Precautions Purpose and function Design and construction Features Rear panel view Rear panel description Level controls Inputs Outputs Control Muting System installation Making the connection Troubleshooting Care and cleaning Specifications Warranty Accessories included Manual and Power cord Page 1 page 2 page 3 page 3 page 3 page 4 page 4 6 page 5 page 5 6 page 6 page 8 9 page 7 page 7 8 page 10 10 11 12 13001 rev 0004 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN SAFETY PRECAUTIONS PLEASE READ BEFORE INSTALLING WARNING TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE The lightning flash with arrowhead within an equilateral triangle is intended to alert the user of the presence of uninsulated dangerous voltage within the product s enclosure that may be sufficient magnitude to constitute a risk of electric shock to you The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance servicing instructions in the literature accompanying the unit Observance of polarity is essential Double check connections before turnin
6. g the amplifier on The amplifier can be damaged if polarities are incorrect Damage can occur to your speakers if the power rating of each individual driver is exceeded by the amplifier Ensure that all the drivers in your speaker system are capable of handling not only the power being delivered by the amplifier but the energy that is likely to be generated during strong passages Turn amplifier off when plugging in or unplugging input and speaker cables The AV5125 is equipped with raised feet so that continuous ventilation can be maintained They help to maintain acoustic feedback into the amplifier at a minimum They also provide a measure of protection against scratching any surface the unit might be resting on Do not alter or remove them Do not stack anything on top of the amplifier preamplifier processor source etc Leave at least 2 3 inches clearance from the top of the amplifier to the next shelf component etc to ensure proper ventilation If you are at all unsure of what the speaker ratings are contact your dealer Page 2 13001 rev 0004 The AV5125 s purpose and function The AV5125 is a compact very efficient five channel power amplifier It is designed to be used in all types of audio or audio video systems Design and construction The AV5125 utilizes high quality electronic circuitry to achieve an environment wherein a detailed transparent and highly musical sound can be realized The high q
7. hing different driver impedances Any fine tuning should be done by the preamplifier Example When using 4 ohm and 8 ohm speakers together the 4 ohm may sound louder than the 8 ohm at a given volume level The level controls on the amplifier are used to match the speakers volume levels Clockwise will increase the output Counter Clockwise will decrease the output Louder Softer Figure E Inputs RCA type connectors accept line input from the preamplifiers output connectors There are five input connectors one for each channel that may be used to connect the amplifier to the preamplifier RCA cable connector Page 5 13001 rev 0004 Here is a typical preamplifier to amplifier setup From Right Front output _ From Right Rear output From Left Rear output From Center output From Left Front output Figure C Outputs Five way binding posts are provided One pair for each channel They are designed to accept a banana type plug or spade lug connector shown below and are color coded for easy identification The red post should always be connected to the speakers jack The black post should always be connected to the speakers jack Sts Spade connector Banana jack Here is a typical amplifier output setup CHANNEL 1 CHANNEL 2 CHANNEL 3 CHANNEL 4 CHANNEL 5 OUTPUT OUTPUT OUTPUT OUTPUT PES MI s P s MI s P s MI s PLES MI s PLES MINS ARAR
8. p K Components Ltd Made In the U S A Lo H Lo H Lo H waw bkcomp co ke m SER NO CHANNEL 2 CHANNEL 3 CHANNEL 4 CHANNEL 5 CHANNEL 6 OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT LEVEL 2 LEVEL 4 LEVEL 6 1 AC fuse holder 2 AC Input receptacle 3 Speaker outputs 1 AC fuse holder 2 AC Input receptacle 3 Speaker outputs 4 Amplifier control muting input output 5 Level controls 6 Inputs Rear panel description Holds the AC Line fuse This fuse is an 12 Amp 250 Volt Slow Blow fuse Replace with same type and value fuse only For attaching the supplied AC power cord to the amplifier For connecting the speakers to the amplifier Explained further on page 6 4 Amplifier control muting input output To provide remote switching of mute on off of the amplifier Explained further on page 8 Page 4 13001 rev 0004 5 Level controls For adjusting the input level of each channel into the amplifier There are five level controls on the back of the amplifier One level control for each channel Explained further below 6 Inputs For connecting signal patch cables interconnects from the preamplifier to the amplifier to pass signal Explained further below Level controls When using the level controls first start with them turned all the way up clockwise Then adjust them according to your system requirements to match the sound level coming from each speaker This is a rough adjustment for matc
9. perly installed incorrectly fused misused abused or subjected to harmful elements used in any way not in accordance with instructions supplied with the unit or to have been modified repaired or altered in any way without the expressed written consent of B amp K This warranty does not apply to the cabinet the remote controller or appearance items such as the faceplate control buttons or display lenses nor does it cover any expenses incurred in shipping the unit to and from the manufacturer s service depot No warranty implied or otherwise created by State law shall extend beyond the terms of this warranty and B amp K shall not be liable for any incidental or consequential damage arising out of a defect in material or workmanship of the unit during the terms of this warranty or thereafter Some States do not allow the exclusion or limitation of incidental or consequential damages and the foregoing exclusions may not apply to you This warranty gives you specific legal rights Your may also have other rights which vary from State to State No agent representative dealer or employee of B amp K has the authority to increase or alter the obligations or terms of this warranty B amp K Components Ltd RETURNING EQUIPMENT No equipment may be returned to B amp K Components Ltd Without a RETURN AUTHORIZATION Should you find it necessary to return equipment to B amp K for any reason a RETURN AUTHORIZATION RA number must be issued by
10. s illustrated in figure E Page 8 13001 rev 0004 If a source other than a B amp K series preamplifier is used to control multiple amplifiers only the control output voltage from the source is critical It must be within the range as indicated on the rear panel 5 24 volts DC is required The amplifier will provide each successive amplifier with a control voltage of 12 volts DC for reliable operation The amplifiers control output may be used as a source of 12 VDC 125 mA for other user applications as well DO NOT POWER MOTORS WITH THIS CIRCUIT Rear view of amplifier Rear view of second From preamplifier with control input amplifier with control input rear panel control output CONTROL VO CONTROL VO Daisy chain to other amplifiers Figure E If the control function is desired each unit in the system must remain connected at all times and the control must be enabled To enable the control function the CTRL ENABLE button must be out for each controllable amplifier in the system For more information on the amplifiers output status under various control conditions refer to the following table CTRLIN CTRL OUT OUT No Signal OUT No Signal Note The control voltage is for muting control only Each amplifier must be connected to its own source of AC power in order for it to operate Page 9 13001 rev 0004 Troubleshooting PROBLEM No sound on LED not illuminated Power cord not plugged in Po
11. sing it neatly along the way Count the divisions to the next full foot and add one foot to allow for some movement of the components This will provide you with the ideal cable length Making the connection Before doing anything ensure that the power switch on the amplifier s front panel is in the off position Again it is recommended that you locate a separate AC power outlet for the amplifier one that is not shared by any other audio component in the system or any other house hold component This will eliminate the possibility of the amplifier modulating the power being supplied to the component and compromising the signal originating from that component Locate the AC power cord provided with the amplifier and plug it into the power input receptacle in the rear panel Do not connect it to the AC power source yet Page 7 13001 rev 0004 Connect the audio cables from your preamplifier s output to the corresponding input connector on the amplifier Connect the wires from your speakers to the appropriate outputs on the amplifier It is absolutely essential that you observe correct polarity in these connections Example If you connect your left front output of your preamplifier to channel 4 input on the amplifier remember to connect your left front speaker wires to channel 4 s outputs Always observe polarity when connecting speakers connect amplifiers to the speakers and amplifiers to speakers
12. uality parts complement include state of the art solid state devices 1 metal film resistors computer grade electrolytic power supply capacitors and a high capacity toroidal transformer The AV5125 operates class A predriver and AB high current MOSFET power output stages It is capable of reproducing the most demanding audio signals at rated power levels Features Toroidal Transformers Efficient high current transformer for improved dynamics Discrete Circuitry More accurate and three dimensional reproduction of source material Class A Predriver Improves low level detail for smoother more musical sound AB MOSFET Output Stage For efficient and linear power delivery Limited Protection Provides short term protection from accidental shorting of output devices and protection from thermal overload Gold Plated Connectors Improve connections for better sound and minimized signal loss and degradation 1 Metal Film Resistors Low noise resistors for better sound and a greater degree of repeatability High Current Ability to reproduce demanding recordings Computer Grade Capacitors Large capacity computer grade electrolytic capacitors for extended low frequency control and improved dynamics Page 3 13001 rev 0004 Rear Panel View CONTROL VO WHEN SWITCH OPERATE WHILE A5 24V SIGNAL IS APPLIED TOCONTROLIN LEVEL CONTROLS 5 amp LEVEL 1 LEVEL 3 LEVEL 5 WE Simpty SOUND BETTER o o B am
13. wer off at AC source AC power inlet fuse blown or faulty Control switch in the wrong position No sound on some or all selected channels on LED illuminated Line stage to amp cables loose or faulty Source to line stage cables loose or faulty Line stage or source not correctly selected Sound lacks direction bass weak Loud hum or buzz on one 1 or more channels Speakers connected out of phase Poor ground connection in interconnect cables POSSIBLE CAUSE Speaker leads loose or faulty POSSIBLE SOLUTION Reconnect power cord Check AC switch or fuse Check for shorts or overloading Place control switch in proper position page 9 Tighten repair or replace cable Tighten repair or replace cable Tighten repair or replace cable Check all switch settings Check connections making sure that cables are connected to and to 1 Check all connectors and repair as necessary Channel sounds distorted 1 Blown rail fuse 1 Replace blown rail fuse and low in output inside amplifier Note If unit continues to blow power inlet fuses DO NOT USE A HEAVIER FUSE have it serviced Care and cleaning Under normal use the amplifier will not require any special care Over time you may wish to clean the exterior of the unit by wiping it with a damp cloth to remove any dirt of dust that accumulates on it Do not let any liquid enter the amplifier thru the vents in
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