ST140M Single Channel Amplifier OWNER’S MANUAL B & K Components Ltd.
B&K Components, Ltd.
Table of contents Safety Precautions Page 2 Purpose and function Page 3 Design and construction Page 3 Features 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 Troubleshooting Page 11 Care and cleaning Page 11 Specifications Page 12 Warranty page 13 Accessories included: Manual and Power cord Page 1 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 The ST140M's purpose and function The ST140M is a compact, very efficient, single channel power amplifier. It is designed to be used in all types of audio or audio/video systems. Design and construction The ST140M utilizes high quality electronic circuitry to achieve an environment wherein a detailed, transparent, and highly musical sound can be realized.
Rear Panel View 1. AC fuse holder 5. RCA input (unbalanced) 2. AC Input receptacle 6. Level controls** 3. Speaker outputs 7. Amplifier control muting input/output 4. Balanced Input ** OPTIONS AVAILABLE FOR THE ST140M AMPLIFIER Rear panel description 1. AC fuse holder - Holds the 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.
6. Level controls - Option available for the ST140M amplifier. For adjusting the input level to the amplifier. Explained further on page 6. 7. Amplifier control muting input/output To provide remote switching of mute on/off of the amplifier. Explained further below. Control muting A control is provided on each ST140M amplifier to allow remote switching of mute on/off.
If the control function is desired, each unit in the system must remain connected at all times and the control must be enabled. To enable the control function, the CTRL ENABLE button must be out for each controllable amplifier in the system. For more information on the amplifiers output status under various control conditions, refer to the table below.
Outputs Five way binding posts are provided. One pair for each channel. They are designed to accept a banana-type plug or spade lug connector (shown below) and are color coded for easy identification. The red (+) post should always be connected to the speakers (+) jack. The black (-) post should always be connected to the speakers (-) jack. Spade connector Banana jack Here is a typical amplifier setup: )LJXUH ' The ST140M amplifier has two sets of binding posts on it.
Inputs Unbalanced - RCA type connectors accept line input from the preamplifier’s unbalanced output connectors. There are two input connectors, that may be used to connect the amplifier to the preamplifier. The Channel 3 input is used for normal operation. RCA cable connector - Operation - For unbalanced operation, ensure the balanced switch between the balanced inputs on the rear of the amplifier is in the ‘off’ (out) position.
System installation There will most likely be a number of cables involved in the installation of your home entertainment system. Pre-planning 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 system by laying out the relative location of each component in the system. Then lay out the proposed cable runs between them. Number each cable and record its length on the diagram for future reference.
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.
Troubleshooting PROBLEM No sound (‘on’ LED not illuminated) POSSIBLE CAUSE 1. 2. 3. 4. No sound on some or all selected channels (‘on’ LED illuminated) 1. 2. 3. 4. POSSIBLE SOLUTION Power cord not plugged in. Power off at AC source. AC power inlet fuse blown or faulty. Control switch in the wrong position. 1. 2. 3. Speaker leads loose or faulty. Line stage to amp. cables loose. or faulty. Source to line stage cables loose or faulty. Line stage or source not correctly selected. 1. 4. 2. 3. 4.
ST140M SPECIFICATIONS Power rating: 8 ohms 4 ohms 170 watts @ 1 kHz 225 watts @ 1 kHz Frequency response 5 Hz - 45 kHz Input sensitivity 1.4 Volts THD (S+N) 0.09 % @ 1 kHz Input impedance 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.) 17"(w) X 15.5"(d) X 5.75"(h) Weight 42 lbs Power consumption 260 watts max 2.
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 use and service.
B&K Components, Ltd. 2100 Old Union Road Buffalo, New York 14227 716-656-0023 www.bkcomp.
