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B&K ST55.2 - page 1
P/N13436 0702 B&K SB ! IMPL Y ETTER B&K Components, Ltd. ST55.2 OWNER’S MANUAL ...
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B&K ST55.2 - page 2
ii B&K Components, Ltd. , 2100 Old Union Road, Buffalo New York 14227-2725 Phone 1-800-543-5252 or (716) 656-0026, Fax (716) 656-1291 E-mail: info@bkcomp.com Web: www.bkcomp.com ...
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B&K ST55.2 - page 3
iii TABLE OF CONTENTS Table of Contents .............................................................................................................. ......................................iii Safety Pr ecauti ons ............................................................................................................. .......................... ...
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B&K ST55.2 - page 4
1 SAFETY PRECAUTIONS PLEASE READ BEFORE INSTALLING WARNING: to prevent fire or sh ock hazard, do not expose this unit to rain or moisture. Car e should be taken to prev ent objects or liquid from entering th e enclos ure. Never handle the po wer cord with wet hands. • The lightning flash with arrowh ead, within an equilateral triangl e, is intend ...
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B&K ST55.2 - page 5
2 PURPOSE AND FUNCTION The ST55.2 is a compact, very efficient, two channel power am plifier. It is designed for use in all types of audio or audio/video systems. The term versatile is al most adequate to describe the va riance of operational modes the ST55.2 is capable of providing. This is all accomplished through t he simple placement of interna ...
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B&K ST55.2 - page 6
3 REAR PANEL R LEVEL L LEVEL HI LO HI LO BUS INPUT LEFT RIGHT LEFT RIGHT MONO BUS OUTPUT WHEN SWITCH IS SET TO ENABLE, THE AMPLIFIER WILL ONL Y OPERATE WHILE A 5-24VDC SIGNAL IS APPLIED TO CTRL IN WHEN SWITCH IS SET TO ENABLE, THE AMPLIFIER WILL ONL Y OPERATE WHILE A 5-24VDC SIGNAL IS APPLIED TO CTRL IN DEFEAT CTRL IN ENABLE CTRL IN ENABLE CONTROL ...
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B&K ST55.2 - page 7
4 CONTROL MUTING A control is provided on each ST55.2 amplifier to allow re mote switching of mute on/off. The preamplifier’s cont rol output, such as is provided with B&K seri es preamplifiers, can be utilized to provide a contro l signal to the ST55.2. If more than one amplifier is being controlled, the con trol signal can be extended to in ...
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B&K ST55.2 - page 8
5 LEVEL CONTROLS There are two level controls on the back of the amplifier. One level control for each channel. Whe n using the level controls, first start with them turned al l the way up (c lockwise). Then a djust them according to your system requirements to match the sound l evel coming from ea ch speaker. This is a rough adjustment for matchin ...
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B&K ST55.2 - page 9
6 Here is a typical amplifier setup: MINUS PLUS PLUS MINUS RIGHT LEFT Channel 1 (-) (+) (-) (+) Channel 2 INTERNAL BUS STRUCTURE In order to gain access to the internal bu s structure, you must first remove the top cover. Tu rn the amplifier so the rear panel is facing your. The jumper module s may be seen on the circuit board just behind the level ...
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B&K ST55.2 - page 10
7 MINUS PLUS PLUS MINUS RIGHT LEFT (-) (+) NOT USED RB U S L+R BUS LB U S NO VOL USE VOL JUMPER DESCRIPTION The jumper modules are used in configuring e ach channel. Each jumper termin al location is conveniently labeled as to the source it can be configured to provi de. R BUS - Along with being the right channel input, it is used as the input to t ...
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B&K ST55.2 - page 11
8 BRIDGED APPLICATION (HIGH VOLTAGE) The ST55.2 may be bridged to drive a high impedance spe aker. To use, place the source g roup jumper for both channels on the ‘L BUS’ j umper terminal. Place the volume group jumper for both channels on the ‘ NO VOL’ jumper terminal. Place the jumper module on the ‘-L’ terminal. Finally, connect the ...
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B&K ST55.2 - page 12
9 SYSTEM INSTALLATION There will most likely be a num ber of cables involved in the installation of your home entertainment system. Preplanning is essential in order to ma ximize system efficiency. We recommend the follo wing as a means of helping you reach that goal. Make a diagram of your propo sed system by laying out the relat ive location ...
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B&K ST55.2 - page 13
10 TROUBLESHOOTING PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION No sound (‘on’ LED not illuminated) 1. Power cord not plugged in. 2. Power off at AC source. 3. AC power inlet fuse blown or faulty 4. Control Input not activated. 1. Reconnect power cord. 2. Check AC swit ch or fuse 3. Check for shorts or overloading 4. Supply Control IN with a 5-24 V ...
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B&K ST55.2 - page 14
11 SPECIFICATIONS Power Rating: 8 ohms 4 ohms 55 watts @ 1 kHz Not recommended THD (S+N) 0.09 % @ 1 kHz Frequency response 5 Hz – 45 kHz Input sensitivity 0.77 Volts Input impedance 33.2 k ohms Damping factor 100 Current (peak to peak) 20 Amps Slew rate 14 V / sec Dynamic headroom 1.4 dB S/N (A-weighted) 95 dB Voltage gain 28 Line voltage 120 ...
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B&K ST55.2 - page 15
12 LIMITED WARRANTY B & K Components Ltd., referred to herein as B & K, warrants your B & K equipment against all d efects in material and workmanship for a period of five years from the date of purchase. This warranty applies o nly to the original purchaser and only to equip ment in normal residential use and service. Defective equipme ...
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B&K ST55.2 - page 16
13 WWW.BKCOMP.COM B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 Phone: 716 – 656 - 0026 ...
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