Rane SM 26B (2003 version) - Manual (Page 4)

Manual- 107370
©Rane Corporation 080 7th Ave. W., Mukilteo WA 9875-5098 USA TEL 5-55-6000 FAX 5-7-7757 WEB www.rane.com
Operating Instructions
Since numerous applications exist for the SM 26B, no single
set of operational procedures control its use. The SM 26B Swiss
Army Mixer RaneNote (included) explores the many configu-
rations of the SM 26B in depth, and you should peruse it for
applications information.
INTERNAL JUMPER OPTIONS
There exist within the SM 26B some signal routing options,
requiring removal of the top cover to move some jumpers.
If an SM 26B needs to have an additional set of independent
outputs, as in a 2x4 stereo distribution amplifier (see Swiss Army
Mixer, Figure 10), the LEFT and RIGHT MIX OUTPUTS
can be used in addition to the 6 MONO OUTS. Normally,
the LEFT and RIGHT MIX OUTPUTS produce the sum mix
of all 6 LEVEL and PAN controls. To break any channel away
from the Mix Output bus, internal jumpers have been provided.
These are located behind the MIX/PAN controls for each chan-
nel. J3 connects MONO OUT 1 to the mix bus. J6 connects
MONO OUT 2, J9 connects MONO OUT 3, and so on — see
the board layout below.
SM 26B Connection
When connecting the SM 26B to other components in your
system for the first time, leave the power supply for last. This
gives you a chance to make mistakes and correct them before
damage is done to anything fragile.
As you have no doubt noticed, all Inputs and Outputs on the
SM 26B’s rear panel are ¼" connectors. The Inputs and Outputs
are active balanced on Tip-Ring-Sleeve (TRS) jacks which allow
the flexibility of connecting in either a balanced or unbalanced
fashion. If unbalanced operation is your preference, the simplest
way to accomplish this is through the use of tip-sleeve ¼" con-
nectors. The ring is not essential unless balanced operation is
required. Be aware that if you are running unbalanced and using
TRS connectors with both tip and ring, the ring and sleeve must
be shorted together. Failure to do so on the inputs results in a
gain loss of 6 dB.
Balanced operation requires that TRS plugs be used. The tip
is hot (+), the ring is return (–) and the sleeve is ground. Rane-
Note, “Sound System Interconnection” (included here) contains
some great pictures to aid your interconnect ventures.