Dangerous Music Monitor - Manual (Page 8)

Internal Jumpers
Monitor is shipped from the factory with its internal jumpers set to interface with
balanced equipment. There are rare cases that certain gear may cause a buzz in the
speakers with the factory presets. The following sections have information that can help
the installer achieve quiet performance.
If one is uncomfortable with opening gear and changing jumpers or making
adjustments, please seek qualified help if necessary.
If adjustments or jumper changes are required, please disconnect the mains plug
before opening the top
. Dropped screws or tools on a live circuit board can manifest themselves
as burn marks and smoked components. This type of damage is not covered by the warranty.
Input cable Shield Header Jumpers are on the main circuit board to facilitate proper
system shielding. If a speaker buzzing problem is encountered, the method to trouble
shoot this situation is to disconnect input wires until the buzz disappears. The cable
pulled when the problem cleared up tells one which shield header jumper should have its
position changed. The jumpers are clearly marked on the main circuit board.
If disconnecting all the inputs does not clear the trouble but disconnecting the amp feeds
does, then there is a ground loop or missing ground reference to the power amplifiers.
The following section on interface may give some clues as to how to solve these types of
problems.
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