Rane SM26 Operating & Service Manual
JUN 2 7 1990
OPERATING I SERVICE MANUAL
SM26
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QUICK START
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Realizing that in most areas there are laws against reading owners manuals, and that reading them under the blankets at
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night with a flashlight makes you feel stupid, we therefore provide this brief, yet informative, description of how to use the
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SM 26 just in case your batteries are low and your mother is about to come in the room.
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To achieve a quick understanding of the SM 26, think of it as a six channel mixer with faders and pans only. Or think of it
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as a 2-to-6 channel splitter with output level controls and a mix knob (to control how much of which input goes to which
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output). If you get that, you may stop here as long as you know how to hook up the power supply.
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As a six channel mixer, MONO IN 1 through 6 may be placed on the Right or Left bus or both, in any amount. The
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respective LEVEL knobs on the front of the unit serve as the mixer's faders, the adjacent PAN controls place the channel's
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signal into the stereo field. As an effects mixer or line level expander for a larger mixer, set up the LEVELS and adjust the
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PANS. The MASTER OUTPUT LEVEL adjusts the overall level of the mix at the Master Outputs.
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As a splitter, place one or both input si
gn
als into the LEFr and/or RIGHT inputs. Select the input(s) to be placed at
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each of the six MONO OUTs by rotating the MIX/PAN control to the proper position. Set the individual CHANNEL
! LEVEL controls for proper output level. The MASTER INPUT LEVEL control on the front adjusts both Right and Left
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Input signal levels together.
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NEVER CONNECT ANYI'HING EXCEYI' AN RS 1 OR OTHER APPROVED RANE AC POWER SUPPLY TO THE
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]) RED THING THAT LOOKS LIKE A TELEPHONE JACK ON THE REAR OF THE SM 26. This is an AC input and re-
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quires some special attention if you do not have an operational power supply EXACTLY like
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the one that was originally
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packed with your unit. See the full explanation of the power supply requirements elsewhere in this manual.
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SYSTEM CONNECTION
When connecting the SM 26 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 dam
ag
e is done to anything fragile.
As you have no doubt noticed, all inputs and outputs on the SM 26's rear panel are 1/4" connectors. The inputs are active
balanced or unbalanced, while the outputs are active unbalanced only. All of these are 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 and sleeve (what some call mono) 1/4" connectors. The ring is not es
sential unless balanced operation is required. You should be aware that if you are running unbalanced and using TRS con
nectors with both ring and tip, the ring and sleeve must be shorted together. Failure to do so on th
.
e inputs results in a gain
loss of 6dB . Failure to do so on the outputs results in loud hum, since the signal ground is hooked to the ring. (This is known
as a floating unbalanced output.)
Balanced operation requires that TRS pl
ug.s
be used. The tip is hot ( + ), the ring is return (-) and the sleeve is ground.
Rane Note 110 (included with your original shipment) contains some great pictures which aid your interconnect ventures.
Consult this handy document to make sure you have done the job
·
properly. You will note the drawin
gs
indicate that shield
be connected only at one end and that balanced operation does not require the use of a ground conductor. The audio si
gn
al
is contained between the tip and ring. It does not require three conductors to pass audio from one component to another,
any more than it does to operate a light bulb. Same principle, less heat. (But equally brilliant!) Connecting too many
grounds between components increases the chances of hum and buzz in your finished system.