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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” within the product’s enclosure that may 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. 

 

• 

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. 

Summary of Contents for ST125.1

Page 1: ...P N13437 0702 B K S B IMPLY ETTER B K Components Ltd ST125 3 ST125 2 ST125 1 Owner s Manual ...

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 ...

Page 3: ...Panel 3 Level Adjustment 4 Inputs 4 XLR Balanced 4 RCA Unbalanced 4 Balanced or Unbalanced Connections 5 Outputs 6 System Installation 7 Making the Connection 7 Control Input and Output 8 Troubleshooting 9 Care and Cleaning 9 Specifications 10 Limited Warranty 11 Returning Equipment 11 Rear Panel Enlarged Veiw 12 WWW BKCOMP COM 13 ...

Page 4: ...ace 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 amplif...

Page 5: ...rolling external systems such as a projection screen or B K amplifier Control Input one 3 5 mm jack that allows standby on off with a 5 24 VDC control signal Gold Plated Connectors better sound with minimum signal loss and degradation Toroidal Transformer Efficient high current shielded transformer that supplies the amplifier with a clean and constant supply of power even during highly demanding s...

Page 6: ...ation with the speaker outputs remaining fused independently 4 Speaker Fuses for protection against amplifier damage in the case of shorted speaker wires Replace fuse with the same type and value 6 AMP T Lag On the ST125 2 channel 3 is not available On the ST125 1 mono amplifier all outputs remain fused independently 5 Balanced Input for connecting signal patch cables interconnects from the preamp...

Page 7: ...e a PAIR of AMPLIFIER CHANNELS for use with either balanced XLR or RCA unbalanced preamplifier processor line outputs INPUT 4 INPUT 5 XLR BALANCED RCA UNBALANCED INPUT 4 INPUT 5 XLR BALANCED There are up to 3 balanced input connectors on the ST125 3 ST125 2 and ST125 1 These connectors accept balanced line level output from the preamplifier s balanced output connectors PIN 1 GND PIN 2 PIN 3 PIN 1 ...

Page 8: ...ED XLR BALANCED RCA UNBALANCED RCA INPUT XLR INPUT RCA INPUT RCA INPUT XLR INPUT XLR INPUT B K S B IMPLY ETTER CHANNEL 1 INPUT CHANNEL 2 INPUT CHANNEL 3 INPUT XLR BALANCED RCA UNBALANCED XLR BALANCED RCA UNBALANCED XLR BALANCED RCA UNBALANCED RCA INPUT XLR INPUT RCA INPUT RCA INPUT XLR INPUT XLR INPUT B K S B IMPLY ETTER C R L L C R FRONT RIGHT FRONT CENTER FRONT LEFT FRONT RIGHT FRONT CENTER FRON...

Page 9: ...s be connected to the speakers jack The negative post should always be connected to the speakers jack Spade connector Banana jack Shown below is the amplifier to speaker connections Channel 1 Channel 3 CHANNEL 3 OUTPUT CHANNEL 2 OUTPUT CHANNEL 1 OUTPUT PLUS MINUS PLUS MINUS PLUS MINUS B K Components Ltd Made in the U S A www bkcomp com CHANNEL 1 OUTPUT CHANNEL 2 OUTPUT CHANNEL 3 OUTPUT F U S E FUS...

Page 10: ...it is recommended that you locate a separate AC power outlet for the amplifier one that is not shared by any other audio component in the system or any other household component This will eliminate the possibility of the amplifier modulating the power being supplied to the component and compromising the signal originating from that component Locate the AC power cord provided with the amplifier and...

Page 11: ...iew of second amplifier with control input Rear view of amplifier with control input Daisy chain to other amplifiers From preamplifier rear panel control output CONTROL I O CTRL IN CTRL OUT 12VDC 125mA CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5 24V SIGNAL IS APPLIED WITH A 3 5mm MINI JACK CONTROL I O CTRL IN CTRL OUT 12VDC 125mA CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5 24V SIGNAL IS APPL...

Page 12: ... Speakers connected out of phase 1 Check all connections making sure that cables are connected to and to Loud hum or buzz on one or more channels 1 Poor ground connection in inter connect cables 1 Check all connectors and repair as necessary Channel sounds distorted and low output 1 Blown rail fuse 1 Replace blown rail fuse inside amplifier Note If unit continues to blow power inlet fuses DO NOT U...

Page 13: ...nput impedance 33 2 k ohms Damping factor ST125 3 ST125 2 ST125 1 100 100 180 Current peak to peak ST125 3 ST125 2 ST125 1 30 30 60 Amps Slew rate 14 V sec Dynamic headroom ST125 3 ST125 2 ST125 1 1 0 1 4 1 5 dB S N A weighted 95 dB Voltage gain 28 Line voltage 120 220 240 VAC switchable Dimensions O A 17 w X 16 d X 5 75 h Weight 37 lbs max Power consumption 680 watts max 7 5 Amps max current draw...

Page 14: ...ades B K delivers exceptional value to its customers But what is Upgradability Upgradability is not a guarantee we define it as a philosophy of designing and manufacturing products so that as audio technology evolves B K can provide enhancements and improvements to its products that are economically viable THE EXPRESS FACTORY WARRANTY HEREIN CONTAINED IS IN LIEU OF ANY AND ALL OTHER WARRANTIES EXP...

Page 15: ... N P U T C H A N N E L 2 I N P U T C H A N N E L 3 I N P U T CONTROL IN ALLOWS AMPLIFIER OPERATION WHEN A 5 24V SIGNAL IS APPLIED WITH A 3 5mm MINI JACK X L R B A L A N C E D R C A U N B A L A N C E D X L R B A L A N C E D R C A U N B A L A N C E D X L R B A L A N C E D R C A U N B A L A N C E D B K Components Ltd Made in the U S A www bkcomp com R C A I N P U T X L R I N P U T R C A I N P U T R C...

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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