User manual B&K ST140M

[. . . ] 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. 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 ST140M 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. [. . . ] 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. @ CTRL IN Signal Signal No Signal No Signal Button position OUT IN OUT IN Output status Sound Sound Mute Sound @ CTRL OUT Signal Signal No Signal 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 The level controls are an option that can be added to the amplifier. If your amplifier has this option, the balanced inputs are not present. When using the level controls, first start with them turned all the way up (clockwise). Then adjust them according to your system requirements to match the sound level coming from each speaker. )LJXUH& Page 6 12999 rev 0005 Outputs Five way binding posts are provided. They are designed to accept a banana-type plug or spade lug connector (shown below) and are color coded for easy identification. 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. The Channel 3 output is used for normal operation, but you can use the Channel 1 output to connect to another speaker in parallel. Page 7 12999 rev 0005 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. If the amplifier does not have balanced inputs then it is always in unbalanced mode. XLR type connectors accept line input from the preamplifier's balanced output connectors. The ST140M has balanced line inputs. Balanced - Balanced cable connector - Operation - For balanced operation, ensure the balanced switch between the balanced inputs on the rear of the amplifier is in the `on' (in) position. If the amplifier is equipped with level controls, the balanced inputs will not be present. Here is a typical input setup: Page 8 12999 rev 0005 System installation There will most likely be a number of cables involved in the installation of your home entertainment system. 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. Number each cable and record its length on the diagram for future reference. Cable runs are critical in that they must be kept away from sources of power radiation (amplifiers, power cords, heaters, etc. . . ). For the sake of safety, they should also be kept out of traffic areas. The process of optimizing the system will include the type of cable, the length of the run, and the obstructions it must deal with along its run. Your dealer can advise you on the products available and their relative merits. [. . . ] This warranty does not apply to the cabinet, the remote controller, or appearance items such as the faceplate, control buttons, or display lenses, nor does it cover any expenses incurred in shipping the unit to and from the manufacturer's service depot. No warranty, implied or otherwise created by State law shall extend beyond the terms 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 thereafter. Some States do not allow the exclusion or limitation of incidental or consequential damages and the foregoing exclusions may not apply to you. No agent, representative, dealer or employee of B&K has the authority to increase or alter the obligations or terms of this warranty. B&K Components Ltd. RETURNING EQUIPMENT No equipment may be returned to B&K Components Ltd. [. . . ]