P/n13437 0702 b&k s b ! Imply etter b&k components, ltd. St125.3 st125.2 st125.1 owner’s manual.
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.
Iii table of contents table of contents ....................................................................................................................................................Iii safety precautions ............................................................................................
1 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, w...
2 purpose and function the st125.3 (three channel), st125.2 (two channel) and st125.1 (mono) are high power amplifiers that are designed for use in all types of audio or audio/video systems. Design and construction the st125.3, st125.2 and st125.1 amplifiers utilize high quality electronic circuitry...
3 rear panel 1 6 5 7 8 3 2 4 c a u t i o n r i s k o f e l e c t r i c s h o c k d o n o t o p e n r i s k o f e l e c t r i c s h o c k d o n o t o p e n fuse caution: for continued protection against risk of fire replace only with same type and rating. Control i/o channel 3 output channel 2 output...
4 level adjustment generally in a home theater application, volume level is controlled by the a/v surround processor. In a system for use with the st125.3, st125.2 or st125.1, adjustment of the volume level must be performed using the external preamplifier/processor. Inputs the st125.3, st125.2 or s...
5 balanced or unbalanced connections shown below are typical preamplifier to amplifier connections: or rca unbalanced connections 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 in...
6 outputs five way binding posts are provided. There is one pair provided for each channel. They are designed to accept a banana-type plug, spade-lug connector (shown below), terminal posts, and bare wire, and they are color coded for easy identification. The positive (+) post should always be conne...
7 system installation there will most likely be a number of cables involved in the installation of your home entertainment system. Preplanning is essential in order to maximize system efficiency. We recommend the following as a means of helping you reach that goal. Make a diagram of your proposed sy...
8 control input and output a control (trigger) system is provided on the st125.3, st125.2 and st125.1 amplifiers to allow remote switching of the amplifier’s standby on/off feature. The control input is designed to operate with a source (trigger) of 5-24 volts ac or dc. All b&k a/v processors and pr...
9 troubleshooting problem possible cause possible solution no sound (‘on’ led not illuminated) 1. Power cord not plugged in. 2. Power off at ac source. 3. Ac power inlet fuse blown or faulty 4. Control input not activated. 1. Reconnect power cord. 2. Check ac switch or fuse 3. Check for shorts or ov...
10 specifications power rating: 8 ohms - st125.3/st125.2/st125.1 4 ohms - st125.3/st125.2/st125.1 140/140/170 watts @ 1 khz 185/185/225 watts @ 1 khz thd (s+n) 0.09 % @ 1 khz frequency response 5 hz – 45 khz input sensitivity rca unbalanced 1.4 volts input sensitivity xlr balanced 2.8 volts pin 1 = ...
11 limited warranty b & k components ltd., referred to herein as b & k, warrants your b & k equipment against all defects in material and workmanship for a period of five years from the date of purchase. This warranty applies only to the original purchaser and only to equipment in normal residential...
12 rear panel enlarged veiw caution risk of electric shock do not open risk of electric shock do not open fuse caution: for continued protection against r isk of fire replace o nl y w ith same type and r ating. Control i/o channel 3 output channel 2 output channel 1 output plus + minus - plus + minu...
13 www.Bkcomp.Com b&k components, ltd. 2100 old union road buffalo, new york 14227 phone: 716 – 656 - 0026.
