B&K ST1200 Series manual

B & K Components Ltd. P/N 12687[...]

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 4 Rear panel v iew Page 4 Rear panel descr iption Page 5 Control muti ng Pag e 5 - 6 Level contr ols Page 6 Inputs Page 7 Outputs Page 8 Internal Bus Page 9 Jumper descripti on Page 9 - 10 Mono applic ation Page 11 Bridg ed application Page 12[...]

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 ST1200 series II is a compact, very efficient, two channel pow er amplifier . It is designed to be used in al l types of audio or audi o/video sy stems. The term versatile is almost adequate to descri be the vari ance of operational modes the ST1200 series II is capable of providi ng. This i s all accomplis hed through the simpl e placem[...]

Page 4 - Efficient high curr ent transformer for improved dy namics. - More accur ate and three dimensional r eproduction of source material. - Prov ides short term protecti on from accidental shorting of output devic es and protection from thermal over load. - Improv e connections for better sound and mi nimiz ed signal loss and degradati on. - Lo[...]

Page 5 1. A C fuse holder - Holds the AC Line fuse. This fuse is an 8 Amp / 250 Volt Slow Bl ow fuse. Replace w ith same type and value fuse only. 2. A C Input receptacle - For attaching the suppl ied AC pow er cord to the amp lifier. 3. Speaker outputs - For connecting the speaker s to the amplifier. Ex plained further on page 8. 4. A mplifier con[...]

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 Example: W hen using 4 ohm and 8 ohm speakers together, the 4 ohm may sound louder then 8 ohm at a g iven v olume level. The l evel contr ols on the ampli fier are used to match the speakers volume level. Clockwise w ill increase the output. Counter clockwise will decrease the outp u t. RCA ty pe connectors accept line i nput from the preamp[...]

Page 8 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 9 In order to g ain access to the internal bus structur e, you must first r emove the top cover . Turn the amplifier so the rear panel i s facing y our. The jumper modul es may be seen on the circuit boar d just behind the lev el controls. Below i s the default setup for the ST1200 series II amplifier. By arrang ing the j umpers allow s you to[...]

Page 10 Along w ith being the right channel input, it is used as the i nput to the right bus and the right sour ce for the ‘L+R BUS’ . Because it is a BUS i nput, any signal input here w ill appear at the ‘R BUS’ jumper terminal f o r both of the ST1200 series II ’ s jumper modul es. Installing a jum per plug at th is te rminal on either [...]

Page 11 The ST1200 series II ’s tw o output channels may be parallel ed (mono) to combine the left and right channels output cur rent. This feature all ows the ampli fier to double its apparent output current. To use, pl ace the source group j umper for both channels on the ‘L BUS’ jumper terminal. Place the v o lume group jumper for both cha[...]

Page 12 The ST1200 series II may be bridg ed to driv e a high i mpedance speaker. To use, place the source gr oup jumper for both channels on the ‘L BU S’ jumper terminal . Place the volume g roup jumper for both channels on the ‘ NO VOL’ jumper ter minal. Place the jumper module on the ‘ -L’ termi nal. Finally , connect the speakers (+[...]

Page 13 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 14  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 ampli fier’s power cord into the AC pow er source. Turn the amplifier’s power sw itch ‘on’. The panel light shoul[...]

Page 15 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 16 Power rating: 8 ohms 60 watts @ 1 kHz 4 ohms Not recommended Frequency response 5 Hz - 45 kHz Input sensitiv ity 0.77 Volts THD (S+ N) 0.09 % @ 1 kHz Input impedance 33.2 k ohms Damping factor 100 Current ( peak to peak) 20 Amps Slew r ate 14 V / ) sec Dynami c headroom 1.4 dB S/N (A- weig hted) 95 dB Voltage g ain 28 Line vol tage 120/220/[...]

Page 17 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 Com ponents, Ltd. 2100 O l d Union Road Buf fa l o, New York 14227 716-656- 0023 www. bk co mp. co m[...]