B&K ST55.2 User Manual
B&K
SB!IMPLY ETTER
B&K Components, Ltd.
ST55.2
OWNER’S MANUAL
P/N13436 0702
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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Table of Contents ....................................................................................................................................................iii
Safety Precautions .................................................................................................................................................. 1
Purpose and Function............................................................................................................................................. 2
Design and Construction........................................................................................................................................ 2
Features.................................................................................................................................................................... 2
Rear Panel ................................................................................................................................................................ 3
Control Muting ......................................................................................................................................................... 4
Level Controls.......................................................................................................................................................... 5
Inputs ........................................................................................................................................................................ 5
Outputs ..................................................................................................................................................................... 5
Internal Bus Structure............................................................................................................................................. 6
Jumper Description ................................................................................................................................................. 7
Mono Application (Medium Current) ..................................................................................................................... 7
Bridged Application (High Voltage) ....................................................................................................................... 8
System Installation.................................................................................................................................................. 9
Making the Connection ........................................................................................................................................... 9
Troubleshooting .................................................................................................................................................... 10
Care and Cleaning ................................................................................................................................................. 10
Specifications ........................................................................................................................................................ 11
Limited Warranty ................................................................................................................................................................12
Returning Equipment .........................................................................................................................................................12
WWW.BKCOMP.COM ............................................................................................................................................ 13
TABLE OF CONTENTS
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SAFETY PRECAUTIONS
PLEASE READ BEFORE INSTALLING
WARNING: to prevent fire or shock hazard, do not expose this unit to rain or moisture. Care should be
taken to prevent objects or liquid from entering the enclosure. Never handle the power cord with wet
hands.
• The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user of the
presence of uninsulated “dangerous voltage
electric shock to you.
” within the product’s enclosure that may constitute a risk of
• 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.
• Caution: To prevent the risk of electric shock, do not remove cover. No user-serviceable parts inside.
Refer servicing to qualified service personnel.
• Unplug the amplifier from the AC outlet when plugging in or unplugging cables, when left unused for an
extended period of time, moving the amplifier, or when you suspect lightning in your area.
• Prevent damage to the power cord. Do not bend, pull, place objects on, alter, etc. Replace the power cord
if it becomes damaged. Always grasp the plug on the power cord when plugging in or unplugging the
amplifier from the AC outlet.
• Your system may produce sound levels capable of causing permanent hearing loss. Do not operate for
extended periods of time at high volume levels.
• Make sure the amplifier is placed on a level surface.
• The amplifier is equipped with raised feet to provide ventilation, reduce acoustic feedback, and provide
protection against scratching the surface the unit is resting on. We advise against removing or altering
feet.
• Do not stack anything on top of the amplifier (processor, source, etc.) Leave a minimum of 2” clearance
from the top of the amplifier to the next shelf (or component) to insure proper ventilation.
• The amplifier should be located away from other sources that may be sensitive to heat.
• Do not perform any internal modifications to the amplifier.
• Always connect the amplifier’s power cord to an unswitched AC outlet for normal operation.
• If young children are present, adult supervision should be provided until the children are capable of
following all rules for safe operation.
• Do not plug the amplifier’s power cord into an outlet with an unreasonable number of other devices. Be
careful if using extension cords and ensure the total power used by all devices does not exceed the
power rating (watts/amperes) of the extension cord. Excessive loads may cause the insulation on the
cord to heat and possibly melt.
• Mistaking CONTROL OUTPUT or CONTROL INPUT connectors for audio/video inputs or outputs may
damage your amplifier or other components.
• 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 system are capable of handling not only the average power
being delivered by the amplifiers, but also the peak power that is likely to be generated during strong
passages. If you are unsure of your speaker's power rating, contact the speaker manufacturer or the
dealer where you purchased them.
• The amplifier should be serviced by qualified personnel when:
A. The amplifier is not functioning properly.
B. Objects have entered the chassis.
C. The amplifier was exposed to rain or other type of moisture.
D. The amplifier was dropped, or the chassis is damaged
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PURPOSE AND FUNCTION
The ST55.2 is a compact, very efficient, two channel power amplifier. It is designed for use in all types of audio or
audio/video systems. The term versatile is almost adequate to describe the variance of operational modes the
ST55.2 is capable of providing. This is all accomplished through the simple placement of internal jumpers and the
paralleling or bridging of its outputs and/or linking multiple ST55.2’s.
Here is a listing for some of the many tasks it can be set up to perform:
• The most obvious function for the ST55.2 is to take 2 separate audio inputs, such as a stereo
pair, and provide 2 separate amplified outputs. Your ST55.2 has arrived set up in this
configuration.
• With the inputs buffered, a line output (OUT BUS) may be taken from the L BUS, R BUS, or L+R
BUS and sent on to another amplifier. This allows for linking of multiple amplifiers.
• Continuing its versatility, the ST55.2 may be used mono to provide one, medium current channel
in order to drive a speaker requiring more power.
•
As a result of the ST55.2’s unique bus system, the input to the left channel may be inverted
thereby allowing the possibility of creating a single high voltage (bridged) channel from one
source, through the left bus.
DESIGN AND CONSTRUCTION
The ST55.2 utilizes high quality electronic circuitry to achieve an environment wherein a detailed, transparent,
and highly musical sound can be realized. The high quality complement of parts, include state-of-the-art solidstate devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity
toroidal transformer.
FEATURES
Toroidal Transformer - Efficient high current transformer for improved dynamics.
Discrete Circuitry - More accurate and three dimensional reproduction of source material.
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.
Medium Current - Ability to reproduce demanding recordings.
Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors for extended low frequency
control and improved dynamics.
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