User manual B&K ST260

[. . . ] It is designed to be used in all types of audio or audio/video systems. The term versatile is almost adequate to describe the variance of operational modes the ST260 is capable of providing. This is all accomplished through the simple placement of internal jumpers and the paralleling or bridging of it's outputs and/or linking multiple ST260's. Here is a listing for some of the many tasks it can be set up to perform: & The most obvious function for the ST260 is to take 2 separate audio inputs, such as a stereo pair, and provide 2 separate amplified outputs. [. . . ] There are two input connectors, one for each channel, that may be used to connect the amplifier to the preamplifier. RCA cable connector - Here is a typical input setup: )LJXUH' You will notice the OUT BUS connections shown above. The L+R BUS OUT carries the combined signal from the left and right inputs. Page 7 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( Page 8 ST260's internal bus structure In order to gain access to the internal bus structure, you must first remove the top cover. The jumper modules may be seen on the circuit board just behind the level controls. By arranging the jumpers allows you to configure the amplifier for different applications. If you wish to use the amplifier as a stereo (two channel) amplifier, you need not change any of the settings. )LJXUH) In order to reconfigure the ST260's channels, remove the source control group jumper from its present position (if necessary) and install it on the terminal you wish to select as the source for that channel. Make sure it has been inserted on both terminal pins of the jumper modules. To complete the configuration, the volume group jumper should be placed at either the `USE VOL' or `NO VOL' terminal depending on you configuration. Note: A channel that is not being used in your configuration should have its jumper plugs installed at the default position as shown in Figure F. Jumper description Figure G illustrates the jumper modules used in configuring each channel. Each jumper terminal location is conveniently labeled as to the source it can be configured to provide. Explained further on the following page. )LJXUH* Page 9 R BUS - Along with being the right channel input, it is used as the input to the right bus and the right source for the `L+R BUS'. Because it is a BUS input, any signal input here will appear at the `R BUS' jumper terminal for both of the ST260's jumper modules. L+R BUS - Installing a jumper plug at this terminal on either of the two internal jumper modules selects the combined signal being carried by both the left and right inputs. If the left bus and right bus are being used to carry stereo right and left channels, a jumper plug installed at the `L+R BUS' location will provide a true L+R mono output. L BUS Along with being the left channel input, it is used as the input to the left bus and the left source for the `L+R BUS'. Because it is a BUS input, any signal input here will appear at the `L BUS' jumper terminal for both of the ST260's jumper modules. NO VOL - If volume control is desired only from the source, or if outputs are being combined to obtain higher power, the jumper plug should be installed at the `NO VOL' location. USE VOL - If volume control is desired at the amplifier, beyond that provided at the source, a shorting plug is installed at the `USE VOL' location. The `USE VOL' setting SHOULD NOT be used when channels are bridged or combined. Invert Jumper module This is a single jumper module that is set apart, up and to the right from the channel jumper modules on the circuit board. It provides a special function, when the jumper is set on the `-L' pins, the left bus signal feeding the left channel will be inverted. Note: A jumper MUST be installed at L BUS, R BUS, or L+R BUS, AND a jumper MUST be installed at NO VOL or USE VOL for the amplifier to operate. Page 10 Mono application (Medium current) The ST260's two output channels may be paralleled (mono) to combine the left and right channels output current. This feature allows the amplifier to double its apparent output current. To use, place the source group jumper for both channels on the `L BUS' jumper terminal. For the sake of safety, they should also be kept out of traffic areas. [. . . ] 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. [. . . ]