B&K 4420 инструкция обслуживания

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 Level contr ols Page 6 Outputs Page 7 Inputs Page 7 - 8 System installation Page 9 Making the connecti on Page 9 - 10 Troubleshooting Page 11 Care and cle[...]

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 of the presence of uninsul ated “dangerous voltage” within the product’ s enclosure that may be suffici ent magnitude to constitute a r isk of [...]

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. The hi gh quality parts[...]

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. Replace w ith same type and value fuse only. 2. A C Input receptacle - For at[...]

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. Ex plained further on page 6. 7. A mplifie[...]

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. For more information on the amplifiers output status under various contr ol conditions, r efer t[...]

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. The black (-) post should always 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 . Balanced cable connector - Operation - For balanced operation, ensure the bal anced switch betw een the balanced inp[...]

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. W e recommend the follow ing as a means of helpi ng y ou reach that goal:  Make a diagr am of your proposed sy stem by l aying out the relativ e location [...]

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.  Double check all connecti ons.  Plug the [...]

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. overloading. 4. Control switch in the wrong 4. Place control switch in position. proper[...]

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 1.2 dB S/N (A- weig hted) 95 dB Voltage g ain 28 Line vol tage 120/2[...]

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. Defective equipment must be returne[...]

B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 716-656-0023 www.bkcomp.com[...]