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12999 rev 0005

SAFETY PRECAUTIONS 

PLEASE READ BEFORE INSTALLING

WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE.

The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the
user of the presence of uninsulated “dangerous voltage” within the product’s enclosure
that may be sufficient magnitude to constitute a risk of electric shock to you.

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.

Observance of polarity is essential.  Double-check connections before turning the
amplifier on.  The amplifier can be damaged if polarities are incorrect.

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 speaker system
are capable of handling not only the power being delivered by the amplifier, but
the energy that is likely to be generated during strong passages.

Turn amplifier ‘off’ when plugging in or unplugging input and speaker cables!!!

The ST140M is equipped with raised feet so that continuous ventilation can be
maintained.  They help to maintain acoustic feedback into the amplifier at a
minimum.  They also provide a measure of protection against scratching any
surface the unit might be resting on.  

Do not alter or remove them.

Do not stack anything on top of the amplifier (preamplifier, processor,
source...etc.).

Leave at least 2-3 inches clearance from the top of the amplifier to the next shelf,
component, etc., to ensure proper ventilation.

* If you are at all unsure of what the speaker ‘ratings’ are, contact your dealer.

Summary of Contents for ST140M

Page 1: ...ST140M Single Channel Amplifier OWNER S MANUAL B K Components Ltd 12999 rev 0005...

Page 2: ...12999 rev 0005 B K Components Ltd 2100 Old Union Road Buffalo New York 14227...

Page 3: ...es Page 3 Rear panel view Page 4 Rear panel description Page 4 5 Control muting Page 5 6 Level controls Page 6 Outputs Page 7 Inputs Page 8 System installation Page 9 Making the connection Page 9 10 T...

Page 4: ...ct 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 speaker system are capable of handling not only the...

Page 5: ...e most demanding audio signals at rated power levels Features Toroidal Transformers Efficient high current transformer for improved dynamics Discrete Circuitry More accurate and three dimensional repr...

Page 6: ...AC Line fuse This fuse is an 8 Amp 250 Volt Slow Blow fuse Replace with same type and value fuse only 2 AC Input receptacle For attaching the supplied AC power cord to the amplifier 3 Speaker outputs...

Page 7: ...al can be extended to include each successive unit by simply running a 3 5mm mini jack cable from the CTRL OUT connector of the first amplifier to the CTRL IN connector of the next unit commonly refer...

Page 8: ...nal No Signal OUT Mute No Signal No Signal IN Sound Signal Note The control voltage is for muting control only Each amplifier must be connected to its own source of AC power in order for it to operate...

Page 9: ...rs jack The black post should always be connected to the speakers jack Spade connector Banana jack Here is a typical amplifier setup The ST140M amplifier has two sets of binding posts on it They are p...

Page 10: ...f the amplifier is in the off out position If the amplifier does not have balanced inputs then it is always in unbalanced mode Balanced XLR type connectors accept line input from the preamplifier s ba...

Page 11: ...well When possible use a separate AC power line for the amplifier one that is not shared by any other component in the system of any other house hold component Tip Take a piece of stout string longer...

Page 12: ...turn the amplifier off and wait 30 seconds for the amplifier to discharge Both the preamplifier and amplifier should be off Connect a playback unit CD VLD Tuner etc to the preamplifier Turn the volume...

Page 13: ...n bass weak 1 Speakers connected out of phase 1 Check connections making sure that cables are connected to and to Loud hum or buzz on one or more channels 1 Poor ground connection in interconnect cabl...

Page 14: ...dance 33 2 k ohms Damping factor 180 Current peak to peak 60 Amps Slew rate 14 V sec Dynamic headroom 1 5 dB S N A weighted 95 dB Voltage gain 28 Line voltage 120 220 240 VAC switchable Dimensions O A...

Page 15: ...rms of this warranty and B K shall not be liable for any incidental or consequential damage arising out of a defect in material or workmanship of the unit during the terms of this warranty or thereaft...

Page 16: ...12999 rev 0005 B K Components Ltd 2100 Old Union Road Buffalo New York 14227 716 656 0023 www bkcomp com...

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