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12998 rev 0004

The ST2140's purpose and function

The ST2140 is a compact, very efficient, two channel power amplifier.  It is designed to
be used in all types of audio or audio/video systems.  

Design and construction

The ST2140 utilizes high quality electronic circuitry to achieve an environment wherein
a detailed, transparent, and highly musical sound can be realized.  The high quality
parts complement include state-of-the-art solid state devices, 1% metal film resistors,
computer grade electrolytic power supply capacitors, and a high capacity toroidal
transformer.

The ST2140 operates class A predriver and AB high current MOSFET power output
stages.  It is capable of reproducing the 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 reproduction of source

material.

Class A Predriver

 - Improves low level detail for smoother, more musical sound.

AB MOSFET Output Stage

 - For efficient and linear power delivery.

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.

High Current

 - Ability to reproduce demanding recordings.

Computer Grade Capacitors

 - Large capacity computer grade electrolytic capacitors

for extended low frequency control and improved dynamics.

Summary of Contents for ST2140

Page 1: ...ST2140 Two Channel Amplifier OWNER S MANUAL B K Components Ltd 12998 rev 0004...

Page 2: ...12998 rev 0004 B K Components Ltd 2100 Old Union Road Buffalo New York 14227...

Page 3: ...s 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 7 8 System installation Page 9 Making the connection Page 9 10...

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: ...st demanding audio signals at rated power levels Features Toroidal Transformers Efficient high current transformer for improved dynamics Discrete Circuitry More accurate and three dimensional reproduc...

Page 6: ...FOR THE ST2140 AMPLIFIER NOTE THE CENTER CHANNEL IS NOT AVAILABLE ON THE ST2140 AMPLIFIER Rear panel description 1 AC fuse holder Holds the AC Line fuse This fuse is an 8 Amp 250 Volt Slow Blow fuse R...

Page 7: ...to provide a control signal to the ST2140 If more than one amplifier is being controlled the control signal can be extended to include each successive unit by simply running a 3 5mm mini jack cable fr...

Page 8: ...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 Level controls Th...

Page 9: ...s jack Spade connector Banana jack Here is a typical amplifier setup Inputs Unbalanced RCA type connectors accept line input from the preamplifier s unbalanced output connectors There are two input co...

Page 10: ...each channel that may be used to connect the amplifier to the preamplifier Balanced cable connector Operation For balanced operation ensure the balanced switch between the balanced inputs on the rear...

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 100 Current peak to peak 30 Amps Slew rate 14 V sec Dynamic headroom 1 4 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: ...12998 rev 0004 B K Components Ltd 2100 Old Union Road Buffalo New York 14227 716 656 0023 www bkcomp com...

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