The Dangerous Music 2-Bus Manual

Dangerous Music 2-Bus Manual
Sometimes problems that sound like ground loops are caused by other situations. These
require trouble shooting beyond the scope of this section and a qualified technician may
have to make a visit if help is needed.
Expansion Inputs and Connector Pin-Outs
The 2-Bus has an expansion input port that allows connecting other 2-Buses and 2-Bus
LT’s, to increase the system size and capability. The 25-way ‘D’ connector on the rear
panel labeled REM/EXP is used for this purpose. The REM/EXP port is wired according
to the following chart. A pre wired expansion adapter for the 2-Bus is available when
multiple units are bought or additional units are ordered for a facility already using one.
Pin# function
10 right +
23 right –
11 right shield
24 left +
12 left –
25 left shield
All the XLR connectors are pin 2 hot.
Pin 1 shield
Pin 2 + signal
Pin 3 - signal
So far, we have not seen Pin 1 hot (+), except after too many drinks…
The AC Mains cable
The mains cable uses a standard IEC connector. Please check the mains voltage
selector (the little red window next to the IEC connector on the power supply) to
make sure that it is correct for your location. The fuses for the voltage selection block
are _ ampere, fast blow AGC type. PLEASE DON’T PUT A FUSE OF LARGER
RATING IN THE BLOCK! Disconnect the mains cable before changing the voltage
or replacing a fuse. If a fuse blows repeatedly, this is a sign from Mother Nature that
something is wrong and the factory should be contacted for help at the link provided on
the Specifications page.
Please use pre-wired AC cables for this device unless a technically qualified person
makes the connections to a mains plug. In this case, use only high quality mains plugs
like Hubbel, Thomas & Betts, or similar. Remember, in America, Black is hot, White is
neutral, and Green is ground. In Europe, Brown is hot, Blue is Neutral, and Green with a
Yellow stripe is ground. It is critical to get this correct. Double check that it is!
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