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Page 10

12999 rev 0005

Connect the wires from your speakers to the appropriate output on the amplifier. 
It is absolutely essential that you observe correct polarity in these connections. 

Example: If you connect your right  front output of your preamplifier to channel 1 input
on the amplifier, remember to connect your right front speaker wires to channel 1's
outputs.  Always observe polarity when connecting speakers, connect amplifiers (+)
to the speakers (+) and amplifiers (-) to speakers (-).   

Double check all connections.

Plug the amplifier’s power cord into the AC power source.  Turn the amplifier’s
power switch ‘on’.  The panel light should be illuminated.  Leave the preamplifier
turned off.  Before proceeding to the next step 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 on the preamplifier to minimum. Turn on the preamplifier, then the
amplifier (in that order).  Set source on the preamplifier to the playback unit
you’ve just connected.  Turn volume up slowly and music should be heard from
all channels.  If this is not the case, double check your installation.  

Should you encounter any problems that cannot be traced to the source or the
material being played, consult the “TROUBLESHOOTING” section on

 

page

 

11.

Note: When turning equipment ‘off’, the amplifier should always be turned off 

first,

 then

the preamplifier.  When turning equipment ‘on’, the preamplifier should always be turned
on 

first,

 then the amplifier.  

Before turning anything on, ensure the preamplifier is at a

low volume level.

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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