B&K 220M User's Manual
Contents
1. The Channel 3 output is used for normal operation but you can use the Channel 1 output to connect to another speaker in parallel Page 7 13005 rev 0004 Inputs Unbalanced RCA type connectors accept line input from the preamplifier s unbalanced output connectors There are two input connectors that may be used to connect the amplifier to the preamplifier The Channel 3 input is used for normal operation RCA cable connector Operation For unbalanced operation ensure the balanced switch between the balanced inputs on the rear of the amplifier is in the off out position If the amplifier does not have balanced inputs then it is always in unbalanced mode Balanced XLR type connectors accept line input from the preamplifier s balanced output connectors The Reference 220M has balanced line inputs L R PIN 1 oe 7 N 2 PIN 2 pe Balanced cable connector CZ PIN 3 Operation For balanced operation ensure the balanced switch between the balanced inputs on the rear of the amplifier is in the on in position The Channel 3 input is used for normal operation If the amplifier is equipped with level controls the balanced inputs will not be present Here is a typical input setup INPUTS LEVEL CONTROLS INPUTS LEVEL CONTROLS LEVEL 1 LEVEL 2 LEVEL 3 LEVEL 1 LEVEL 2 LEVEL 3 From Left output amp o of preamplifier La HI unbalanced Lo HI LO HI L HI INPUT 1 INPUT 2 INPU2. care Over time you may wish to clean the exterior of the unit by wiping it with a damp cloth to remove any dirt or dust that accumulates on it Do not let any liquid enter the amplifier thru the vents in the top cover You may clean the connectors on the rear panel with isopropyl alcohol annually Page 11 13005 rev 0004 Reference 220M 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 12 250 watts 1 kHz 400 watts 1 kHz 5 Hz 45 kHz 1 4 Volts 0 09 1 kHz 33 2 k ohms 750 150 Amps 14 V usec 1 4 dB 95 dB 28 120 220 240 VAC switchable 17 w X 15 5 d X 5 75 h 42 lbs 350 watts max 4 Amps max current draw 85 watts no input Line 12 Amp 250 Volt Slow Blow Rails 6 Amp 250 Volt Slow Blow 13005 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 han
3. B amp K WE SIMPLY SOUND BETTER Reference 220M Single Channel Amplifier OWNER S MANUAL B amp K Components Ltd B amp K Components Ltd 2100 Old Union Road Buffalo New York 14227 13005 rev 0004 Table of contents Safety Precautions Page 2 Purpose and function Page 3 Design and construction Page 3 Features Page 3 Rear panel view Page 4 Rear panel description Page 4 5 Control muting Page 5 6 Level controls Page 6 Outputs Page 7 Inputs Page 8 System installation Page 9 Making the connection Page 9 10 Troubleshooting Page 11 Care and cleaning Page 11 Specifications Page 12 Warranty page 13 Accessories included Manual and Power cord Page 1 13005 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 turning the amplifier on The amp
4. T 3 From Right output INPUT 1 INPUT 2 INPUT 3 From Left output of preamplifier of preamplifier balanced balanced BALANCE INPUTS a 2 o on 9 o 1 OFF From Right output of preamplifier unbalanced HI LO HI LO ZN OR Figure E Page 8 13005 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 When possible use a separate AC power line for the amplifier one that is not shared by any other component in th
5. ated No sound on some or all selected channels on LED illuminated Sound lacks direction bass weak Loud hum or buzz on one 1 or more channels Low output from amplifier Troubleshooting POSSIBLE CAUSE Power cord not plugged in Power off at AC source AC power inlet fuse blown or faulty Control switch in the wrong position Speaker leads loose or faulty Line stage to amp cables loose or faulty Source to line stage cables loose or faulty Line stage or source not correctly selected Speakers connected out of phase Poor ground connection in interconnect cables Balanced switch in balanced mode when using unbalanced inputs POSSIBLE SOLUTION 1 Reconnect power cord Check AC switch or fuse Check for shorts or overloading Place control switch in proper position Page 5 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 Check all connectors and repair as necessary Put balanced switch in correct position Replace blown rail fuse inside amplifier Channel sounds distorted 1 Blown rail fuse 1 and low in output 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
6. ck 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 is illustrated in figure B 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 W O CONTROL 1 0 OPERATE WHILE 125m4 IS APPLIED i Daisy chain to other amplifiers Page 5 13005 rev 0004 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 table below CTRL IN Button position Output status CTRL OUT our sound Signal OO N Sw Si
7. dling 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 improperly 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 eq
8. e 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 dressing 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 Connect the audio cables from your preamplifiers output to the corresponding input connector on the amplifier Page 9 13005 rev 0004 m Connect the wires from your speakers to the appropriate output on the amplifier It is absolutely essential that you observe correct polarity in these connections Example If you connect your right front output of your preamplifier to channel 1 input on the amplifier remember to c
9. high quality 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 Reference 220M 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 13005 rev 0004 Rear Panel View CONTROL 1 0 B e K CH N Is We Simecy SOUND BETTER B amp K Components Ltd SA Made In the U S A bi 1 AC fuse holder 5 RCA input unbalanced 2 AC I
10. lifier 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 Reference 220M 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 13005 rev 0004 The Reference 220M s purpose and function The Reference 220M is a compact very efficient single channel power amplifier It is designed to be used in all types of audio or audio video systems Design and construction The Reference 220M utilizes high quality electronic circuitry to achieve an environment wherein a detailed transparent and highly musical sound can be realized The
11. na IN 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 Level controls The level controls are an option that can be added to the amplifier If your amplifier has this option the balanced inputs are not present You can not have level controls and balanced inputs on an amplifier There is one level control on the back of the amplifier 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 Louder Softer Figure l Page 6 13005 rev 0004 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 U s Spade connector Banana jack Here is a typical amplifier setup CHANNEL 1 CHANNEL 2 CHANNEL 3 OUTPUT OUTPUT OUTPUT PLUS MINUS PLUS MINUS PLS MINAS Figure D The Reference 220M amplifier has two sets of binding posts on it They are paralleled inside the amplifier The Channel 3 output is used for normal operation The amplifier comes standard with a Channel 1 and Channel 3 output
12. nput receptacle 6 Level controls 3 Speaker outputs 7 Amplifier control muting input output 4 Balanced Inputs OPTIONS AVAILABLE FOR THE Reference 220M AMPLIFIER Rear panel description 1 AC fuse holder Holds the AC Line fuse This fuse is an 12 Amp 250 Volt Slow Blow fuse Replace with same type and value fuse only 2 AC Input receptacle For attaching the supplied AC power cord to the amplifier 3 Speaker outputs For connecting the speakers to the amplifier Explained further on page 7 4 Balanced inputs For connecting Balanced signal patch cables XLR Explained further on page 8 Page 4 13005 rev 0004 5 RCA inputs For connecting signal patch cables interconnects from the preamplifier to the amplifier to pass signal 6 Level controls Option available for the Reference 220M amplifier For adjusting the input level to the amplifier Explained further on page 6 7 Amplifier control muting input output To provide remote switching of mute on off of the amplifier Explained further below Control muting A control is provided on each Reference 220M amplifier to allow remote switching of mute on off The preamplifiers control output such as is provided with B amp K series preamplifiers can be utilized to provide a control signal to the Reference 220M 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 ja
13. onnect your right front speaker wires to channel 1 s outputs Always observe polarity when connecting speakers connect amplifiers to the speakers and amplifiers to speakers m Double check all connections m Plug the amplifiers power cord into the AC power source Turn the amplifier s power switch on The panel light should be illuminated Leave the preamplifier turned off Before proceeding to the next step turn the amplifier off and wait 30 seconds for the amplifier to discharge Both the preamplifier and amplifier should be off m 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 11 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 Page 10 13005 rev 0004 PROBLEM No sound on LED not illumin
14. uipment 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 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 13 13005 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 Reference 220M SERIAL DEALER NAME DEALER PHONE SALES PERSON DATE PURCHASED 13005 rev 0004
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