Instruction/ maintenance manual of the product 4420 B&K
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B & K Components Ltd. P/N 12692.
B&K Components, Ltd., 2100 Old Union R oad, Buffalo, New York 14227.
Page 1 Safety Precautions Page 2 Purpose and function Page 3 Design and constr uction Page 3 Features Page 3 Rear panel v iew Page 4 Rear panel descr iption Page 4 - 5 Control muti ng Pag e 5 - 6 Leve.
Page 2 WA RNING: TO PREVENT FIRE OR SHOCK HA ZA RD, DO NOT EXPOSE THIS UNIT TO RA IN OR MOISTURE. The lightning fl ash with arrowhead, wi thin an equilater al tri angle, is intended to al ert the user.
Page 3 The Reference 4420 is a compact, v ery efficient, tw o channel power amplifier. It is designed to be used in al l types of audio or audi o/video sy stems. The Reference 4420 utilizes high quality electronic circuitry to achieve an environment wher ein a detailed, transpar ent, and highly musical sound can be realized.
Page 4 1. AC fuse holder 5. RCA inputs ( unbalanced) 2. AC Input receptacle 6. Level contr ols ** 3. Speaker outputs 7. Amplifier control muting input/output 4. Balanced inputs 1. A C fuse holder - Holds the AC Line fuse. This fuse is an 12 Amp / 250 Volt Slow Bl ow fuse.
Page 5 4. Balanced inputs - For connecting bal anced signal patch cabl es (XLR ). Explai ned further on page 8. 5. RCA inputs - For connecting si gnal patch cables ( interconnects) from the preamplifier to the ampl ifier to pass signal . 6. Level controls - For adjusting the i nput level to the ampl ifier.
Page 6 If the control function is desired, each uni t in the system must remai n connected at all times and the control must be enabled. To enabl e the control function, the CTRL ENABLE button must be out for each controllabl e amplifier in the sy stem.
Page 7 Five w ay binding posts are pr ovided. One pai r for each channel. They ar e designed to accept a banana-type pl ug or spade lug connector (show n below) and are color coded for easy identificati on. The red (+) post should alw ays be connected to the speakers ( +) jack.
Page 8 Balanced - XLR ty pe connectors accept li ne input from the preamplifier’ s balanced output connectors. There ar e two input connector s, one for each channel, that may be used to connect the ampl ifier to the preamplifier .
Page 9 There will most like ly be a n umbe r of cable s in volved in the installatio n of your ho m e entertainment sy stem. Pre-planning is essential in order to max imiz e system efficiency.
Page 10 Connect the audio cables from y our preampli fier’s output to the corresponding input connector on the ampli fier. Connect the wi res from your speakers to the appropriate output on the ampl ifier. It is absolutely essential that you observ e correct polari ty in these connecti ons.
Page 11 PROBLEM POSSIBLE CA USE POSSIBLE SOLUTION No sound 1. Power cord not plugged in. 1. Reconnect power cord. (‘on’ LED not illuminated) 2. Power off at AC source. 2. Check AC switch or fuse. 3. AC power inlet fuse blown 3. Check for shorts or or faulty.
Page 12 Power r ating: 8 ohms 225 watts @ 1 kHz 4 ohms 350 watts @ 1 kHz Frequency response 5 Hz - 45 kHz Input sensitiv ity 1.4 Volts THD (S+ N) 0.09 % @ 1 kHz Input impedance 33.2 k ohms Damping factor 450 Current ( peak to peak) 75 Amps Slew r ate 14 V / ) sec Dynami c headroom 1.
Page 13 B&K Components Ltd., referred to herein as B&K, warrant s your B&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 t he original purchaser and only to equipment in norm al residential use and service.
B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 716-656-0023 www.bkcomp.com.
An important point after buying a device B&K 4420 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought B&K 4420 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data B&K 4420 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, B&K 4420 you will learn all the available features of the product, as well as information on its operation. The information that you get B&K 4420 will certainly help you make a decision on the purchase.
If you already are a holder of B&K 4420, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime B&K 4420.
However, one of the most important roles played by the user manual is to help in solving problems with B&K 4420. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device B&K 4420 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
