User manual B&K ST1400 II

[. . . ] It is designed to be used in all types of audio or audio/video systems. The ST1400 series II 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 ST1400 series II 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. - Efficient high current transformer for improved dynamics. [. . . ] It must be within the range, as indicated on the rear panel, 5-24 volts DC is required. The amplifier will provide each successive amplifier with a control voltage of 12 volts DC for reliable operation. The amplifiers control output may be used as a source of 12 VDC @ 125 mA for other user applications as well. Page 5 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. @ 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 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. There are two level controls on the back of the amplifier. 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. Page 6 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: Unbalanced - RCA type connectors accept line input from the preamplifier's unbalanced output connectors. There are two input connectors, one for each channel, that may be used to connect the amplifier to the preamplifier. 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. Page 7 Balanced - XLR type connectors accept line input from the preamplifier's balanced output connectors. There are two input connectors, one for each channel, that may be used to connect the amplifier to the preamplifier. 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. Here is a typical input setup: Page 8 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. If building custom length audio cables is not your strength, your dealer should be able to help you with that as well. [. . . ] 1. Channel sounds distorted and low in output 1. 1. ** Note: If unit continues to blow power inlet fuses, have it serviced. Under normal use, the amplifier will not require any special care. Over time you may wish to clean the exterior of the unit by wiping it with a damp cloth to remove any dirt or dust that accumulates on it. Do not let any liquid enter the amplifier thru the vents in the top cover. 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. No equipment may be returned to B&K Components Ltd. [. . . ]