Rane SM 26S User manual

SM26S
SPLITTER / MIXER
CONTENTS (in order of appearance)
Important Safety Instructions
SM26S Manual
SM26S Data Sheet
The SM26S Swiss Army Mixer
Sound System Interconnection
Warranty
Declaration ofConformity
22369
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MASTER
INPUT
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3
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5
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1
POWER
MASTER
OUTPUT
SM26S
SPLITTER
MIXER
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
MIX / PAN
MIX / PAN
MIX / PAN
MIX / PAN
LEVEL
MIX / PAN
LEVEL
MIX / PAN

ATTENTION: RISQUE DE CHOCS ELECTRIQUE - NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
To reduce the risk of electrical shock, do not open the unit. No user
serviceable parts inside. Refer servicing to qualied service personnel.
e symbols shown below are internationally accepted symbols
that warn of potential hazards with electrical products.
is symbol indicates that a dangerous voltage
constituting a risk of electric shock is present
within this unit.
is symbol indicates that there are important
operating and maintenance instructions in the
literature accompanying this unit.
WARNING
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, registers, stoves, or other apparatus (including ampliers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. e wide blade or third prong is provided for your safety. If the provided plug
does not t into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord and plug from being walked on or pinched particularly at plugs, convenience receptacles, and the point where it exits from
the apparatus.
11. Only use attachments and accessories specied by Rane.
12. Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply
cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
15. e plug on the power cord is the AC mains disconnect device and must remain readily operable. To completely disconnect this apparatus from
the AC mains, disconnect the power supply cord plug from the AC receptacle.
16. is apparatus shall be connected to a mains socket outlet with a protective earthing connection.
17. When permanently connected, an all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the
electrical installation of the building.
18. If rackmounting, provide adequate ventilation. Equipment may be located above or below this apparatus, but some equipment (like large power
ampliers) may cause an unacceptable amount of hum or may generate too much heat and degrade the performance of this apparatus.
19. is apparatus may be installed in an industry standard equipment rack. Use screws through all mounting holes to provide the best support.
WARNING: To reduce the risk of re or electric shock, do not expose this apparatus to rain or moisture. Apparatus shall not be exposed to dripping
or splashing and no objects lled with liquids, such as vases, shall be placed on the apparatus.
NOTE: is equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
ese limits are designed to provide reasonable protection against harmful interference in a residential installation. is equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment o and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
CAUTION: Changes or modications not expressly approved by Rane Corporation could void the user's authority to operate the equipment.
CAN ICES-3 (B)/NMB-3(B)
WARNING: is product may contain chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.

ATTENTION: RISQUE DE CHOCS ELECTRIQUE - NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
An d’éviter tout risque de choc électrique, ne pas ouvrir l’appareil.
Aucune pièce ne peut être changée par l’utilisateur. Contactez un
SAV qualié pour toute intervention.
Les symboles ci-dessous sont reconnus internationalement
comme prévenant tout risque électrique.
Ce symbole indique que cette unité utilise un
voltage élevé constituant un risque de choc
électrique.
Ce symbole indique la présence d’instructions
d’utilisation et de maintenance importantes dans le
document fourni.
ATTENTION
INSTRUCTIONS DE SÉCURITÉ
1. Lisez ces instructions.
2. Gardez précieusement ces instructions.
3. Respectez les avertissements.
4. Suivez toutes les instructions.
5. Ne pas utiliser près d’une source d’eau.
6. Ne nettoyer qu’avec un chion doux.
7. N’obstruer aucune évacuation d’air. Eectuez l’installation en suivant les instructions du fabricant.
8. Ne pas disposer près d’une source de chaleur, c-à-d tout appareil produisant de la chaleur sans exception.
9. Ne pas modier le cordon d’alimentation. Un cordon polarisé possède 2 lames, l’une plus large que l’autre. Un cordon avec tresse de masse possède
2 lames plus une 3è pour la terre. La lame large ou la tresse de masse assurent votre sécurité. Si le cordon fourni ne correspond pas à votre prise,
contactez votre électricien.
10. Faites en sorte que le cordon ne soit pas piétiné, ni au niveau du l, ni au niveau de ses broches, ni au niveau des connecteurs de vos appareils.
11. N’utilisez que des accessoires recommandés par Rane.
12. N’utilisez que les éléments de transport, stands, pieds ou tables spéciés par le fabricant ou vendu avec l’appareil. Quand vous utlisez une valise de
transport, prenez soin de vous déplacer avec cet équipement avec prudence an d’éviter tout risque de blessure.
13. Débranchez cet appareil pendant un orage ou si vous ne l’utilisez pas pendant un certain temps.
14. Adressez-vous à du personnel qualié pour tout service après vente. Celui-ci est nécessaire dans n’importe quel cas où l’appareil est abimé : si le
cordon ou les ches sont endommagés, si du liquide a été renversé ou si des objets sont tombés sur l’appareil, si celui-ci a été exposé à la pluie ou
l’humidité, s’il ne fonctionne pas correctement ou est tombé.
15. La che du cordon d’alimentation sert à brancher le courant alternatif AC et doit absolument rester accessible. Pour déconnecter totalement
l’appareil du secteur, débranchez le câble d’alimentation de la prise secteur.
16. Cet appareil doit être branché à une prise terre avec protection.
17. Quand il est branché de manière permanente, un disjoncteur tripolaire normalisé doit être incorporé dans l’installation électrique de l’immeuble.
18. En cas de montage en rack, laissez un espace susant pour la ventilation. Vous pouvez disposer d’autres appareils au-dessus ou en-dessous de celui-
ci, mais certains (tels que de gros amplicateurs) peuvent provoquer un buzz ou générer trop de chaleur au risque d’endommager votre appareil et
dégrader ses performances.
19. Cet appareil peut-être installé dans une baie standard ou un chassis normalisé pour un montage en rack. Visser chaque trou de chaque oreille de
rack pour une meilleure xation et sécurité.
ATTENTION: an d’éviter tout risque de feu ou de choc électrique, gardez cet appareil éloigné de toute source d’humidité et d’éclaboussures quelles
qu’elles soient. L’appareil doit également être éloigné de tout objet possédant du liquide (boisson en bouteilles, vases,…).
REMARQUE: Cet équipement a été testé et approuvé conforme aux limites pour un appareil numérique de classe B, conformément au chapitre 15
des règles de la FCC. Ces limites sont établis pour fournir une protection raisonnable contre tout risque d’interférences et peuvent provoquer une
énergie de radiofréquence s'il n'est pas installé et utilisé conformément aux instructions, peut également provoquer des interférences aux niveaux
des équipements de communication. Cependant, il n'existe aucune garantie que de telles interférences ne se produiront pas dans une installation
particulière. Si cet équipement provoque des interférences en réception radio ou télévision, ceci peut être detecté en mettant l'équipement sous/hors
tension, l'utilisateur est encouragé à essayer de corriger cette interférence par une ou plusieurs des mesures suivantes:
• Réorienter ou déplacer l'antenne de réception.
• Augmenter la distance entre l'équipement et le récepteur.
• Connecter l'équipement à une sortie sur un circuit diérent de celui sur lequel le récepteur est branché.
• Consulter un revendeur ou un technicien radio / TV expérimenté.
ATTENTION: Les changements ou modications non expressément approuvés par Rane Corporation peuvent annuler l'autorité de l'utilisateur à
manipuler cet équipement et rendre ainsi nulles toutes les conditions de garantie.
CAN ICES-3 (B)/NMB-3(B)
Cartons et papier à recycler.

Manual-1
OPERATORS MANUAL SM26S
SPLITTER MIXER
Quick Start
Realizing that in most areas there are laws against reading own-
ers manuals, and that reading them under the blankets at night
with a ashlight makes you feel stupid, we therefore provide this
brief, yet legal description of how to use the SM26S just in case
your batteries are low and your mother is about to come in the
room.
To achieve a quick understanding of the SM26S, think of
it as a six channel mixer with faders and pans only. Or think of
it 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
output). If you get that, you may stop here as long as you know
what a TRS plug is.
As a six channel mixer, MONO INPUT 1 through 6may
be placed on the Right or Left bus or both, in any amount. e
respective LEVEL controls on the front serve as the mixer’s fad-
ers, the adjacent PAN controls place the channel’s signal into the
stereo eld. As an eects mixer or line level expander for a larger
mixer, set up the LEVELS then adjust the PANS. e MAS-
TER OUTPUT LEVEL adjusts the overall level of the mix at
the Master Outputs.
As a splitter, place one or both input signals into the LEFT
and/or RIGHT MASTER INs. Select the Input(s) to be placed
at each of the six MONO OUTPUTS by rotating the MIX /
PAN control to the proper position. Set the individual channel
LEVEL controls for proper output level. e MASTER INPUT
LEVEL control adjusts both Right and Left Input signal levels
together.
WEAR PARTS: is product contains no wear parts.
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MASTER
INPUT
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1
POWER
MASTER
OUTPUT
SM26S
SPLITTER
MIXER
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
MIX / PAN
MIX / PAN
MIX / PAN
MIX / PAN
LEVEL
MIX / PAN
LEVEL
MIX / PAN
SM26S Connection
When connecting the SM26S to other components in your sys-
tem for the rst time, leave the power cord for last. is 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
SM26S’s rear panel are ¼" connectors. e Inputs and Outputs
are active balanced on Tip-Ring-Sleeve (TRS) jacks which allow
the exibility 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. e 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. e 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.

Manual-2
Front Panel Description
1MASTER INPUT LEVEL sets the gain of the Left & Right Master Input stages, with a range of O to +12 dB. In the splitting
mode, this controls the Level of all Mono channel Outputs at once (i.e., those which do not have a separate input).
2Mono Input LEVEL controls the Level of signal through each particular channel. When fed from the MONO INPUT jack,
each stage has a gain range from O to +12 dB minimum, allowing level matching of -10 dBV equipment to +4 dBu gear. When
fed via the LEFT & RIGHT MASTER IN, these LEVEL controls automatically limit to a maximum of unity gain to accommo-
date the +12 dB available from the Left & Right Input gain stages.
3MIX / PAN serves two dierent functions:
MIX: When used as a SPLITTER, this controls the mix of Left and Right Master Input program to each channel’s MONO
OUT.
PAN: When used as a MIXER, this control pans the Mono channel Input between the LEFT and RIGHT MIX OUTPUTS.
4MASTER OUTPUT LEVEL controls the gain of the output stages and the amount of signal at the MIX OUTPUT jacks. It
does not aect the level of any of the six MONO OUTPUTs. is allows an increase in headroom to eliminate overloading due to
excessive combined signal from one or more Inputs. Range of gain is from O to 0 dB (unity). Refer to the block diagram below.
5POWER indicator: When this yellow LED is lit, the SM26S is ready to go (when it’s o, it’s not).
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MASTER
INPUT
2
3
4
5
6
1
POWER
MASTER
OUTPUT
SM26S
SPLITTER
MIXER
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
MIX / PAN
MIX / PAN
MIX / PAN
MIX / PAN
LEVEL
MIX / PAN
LEVEL
MIX / PAN
1 2 3 4 5

Manual-3
Rear Panel Description
1MASTER IN are balanced Tip-Ring-Sleeve (TRS) ¼" Master Inputs. ese Inputs feed all six MONO OUTs when all MONO
INs are not used. Connecting to individual MONO INs disconnects that channel from these Inputs (refer to the Block Diagram).
For unbalanced operation use a standard mono ¼" plug; for balanced operation use a TRS (stereo) ¼" plug wired as follows:
TIP is signal + (connect to Pin 2 on a 3-pin connector).
RING is signal – (pin 3 in a 3-pin connector).
SLEEVE is chassis ground.
2MONO INPUTS are TRS ¼" jacks which accept either balanced or unbalanced mono signals. ese are switching jacks which
automatically bypass the MASTER IN jacks whenever a plug is inserted (see the Block Diagram). Same wiring conventions as in
1 above.
3MONO OUTPUTS are ¼" TRS jacks that deliver either an unbalanced output (use TS plugs), or a balanced output (use TRS
plugs). Follow wiring conventions as in 1 above.
4EXPAND OUTS are ¼" TRS jacks connected in parallel with the MASTER IN jacks, allowing two or more SM26Ss to be
daisychained for multiple splitting. Simply connect the EXPAND OUT to the MASTER IN of another SM26S; there is no limit
to the number of expansions possible with the SM26S.
NOTE: ese Expand Outputs are not buered from the Master Inputs. erefore it is not possible to mix both balanced and
unbalanced lines in the same channel between several units: once the ring and sleeve are shorted anywhere in the chain (by using a
mono plug) the entire line becomes unbalanced.
5MIX OUTPUTS are balanced TRS ¼" outputs controlled by the MASTER OUTPUT LEVEL control. ey are fed either by
the MASTER IN or by any of the six MONO INPUTS, or a combination of both (see e Swiss Army Mixer RaneNote). Follow
wiring conventions as in 1 above.
6Universal Voltage Input: via a miniature IEC 60320 C6 appliance inlet. is mates with an IEC 60320 C5 line cord (USA
domestic). Do not lift the ground connection!
SM26S
All Inputs and Outputs are Balanced: Tip = positive (+), Ring = Negative (–), Sleeve = Chassis Ground.
All audio jacks are Class 2 wiring.
LEFT
RIGHT
LEFT
RIGHT
MONO OUTPUTS
MONO INPUTS
6
5
4
3
2
1
6
5
4
3
2
1
MIX OUTPUT
EXPAND OUT
MASTER IN
100-240 V
50/60 Hz 7 WATTS
RANE CORPORATION
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation. CAN ICES-3 (B)/NMB-3(B)
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
5 1 23 46

Manual-4
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL [phone] FAX [phone] WEB rane.com
Operating Instructions
Since numerous applications exist for the SM26S, no single
set of operational procedures control its use. e SM26S Swiss
Army Mixer RaneNote (included) explores the many congu-
rations of the SM26S in depth, and you should peruse it for
applications information.
Internal Jumper Options
ere exist within the SM26S some signal routing options,
requiring removal of the top cover to move some jumpers.
is must only be done with the power o by qualied service
personnel.
If an SM26S needs to have an additional set of indepen-
dent outputs, as in a 2x4 stereo distribution amplier (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. ese are located behind the MIX/PAN
controls for each channel. 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.
SHIP POSITION: SEND CHANNEL OUTPUT TO THE MIX BUS
CHANGE JUMPER TO DISCONNECT AND ONLY ROUTE TO THE MONO OUT

SM26S
SPLITTER MIXER
Data Sheet-1
General Description
e Rane Model SM26S Splitter Mixer is one of the most useful,
yet unusual audio products available. In its most basic congura-
tion, it is a six-to-two line level mixer. It will accept six balanced
or unbalanced line level inputs which are applied to six Level and
Pan controls. An additional stereo Master Input allows a total of
eight inputs. e result of the mix is sent to an overall Master
Output Level control and appears at the Left and Right Outputs
on the rear. In its splitter mode, the SM26S can take one or two
line level inputs and split these to any of the six Mono Outputs
on the rear. e Mix/Pan controls in this mode control the level
from each of the two input buses to be applied to each Output.
Internal header blocks allow the Mix Outputs to become an
independent stereo out, allowing a total of eight outputs. e
SM26S may also be used as a six input, six output buer ampli-
er in which case signal applied to Input 1 is delivered to Output
1, and so on.
e SM26S may also be used in a combination of modes at once.
For instance, Inputs 1 through 3 may be mixed to the left and/
or right output buses while at the same time Outputs 4 and 5 are
delivering signal originally applied to the Left and Right Master
Inputs while at the same time Output 6 is being driven from
Input 6 in the straight through mode.
e front of the SM26S comprises a Master Input Level
control, six Channel Level controls, six Mix/Pan controls and a
Master Output Level control. e rear of the SM26S provides
two Master Left and Right Inputs, six Mono Inputs, six Mono
Outputs and two Master Left and Right Mix Outputs. All Inputs
and Outputs on the SM26S are ¼" TRS active balanced.
See the RaneNote, “e SM26S Swiss Army Mixer” for addi-
tional application information, available from our website.
Applications
• 6 Mono Inputs, Stereo Output Line Mixer
• 4 Stereo Inputs, Stereo Output Line Mixer
• Stereo Input, 6 Mono Output Line Splitter
• 1 Stereo Input, 4 Stereo Output Splitter
• 6-In, 6-Out Booster Amplier
• Congurable to 8 Outputs
Features
• –10 dBV to +4 dBu Shifter
• +4 dBu to –10 dBV Shifter
• 6 Balanced Mono Inputs, 6 Balanced Mono Outputs
• 2 Main Balanced Inputs, 2 Main Balanced Outputs
• 6 Input Level Controls and 6 Mix/Pan Controls
• Master Input and Output Level Controls
• Internal Universal Power Supply (100-230 VAC)
DATA SHEET

SM26S
SPLITTER MIXER
Data Sheet-2
Features and Specifications
Parameter Specication Limit Units Conditions/Comments
I np ut s: Ty p e Active Balanced
..........Connectors ¼" TRS Tip=(+), Ring=(–), Sleeve=GND
..........Impedance 20k 1% 
..........Maximum Level 22 1dBu
Outputs: Type Active Balanced
..........Connectors ¼" TRS
..........Impedance 125 typ  1 kHz
..........Maximum Level 26 1dBu 10 k or greater
Overall Gain Range O to +12 -0/+6 dB Any Input to any Output
RFI Filters Yes 5%
Frequency Response 10-40 kHz +0/-3 dB
THD+Noise 0.008 .002 % +4 dBu, 20-20 kHz unity gain
IM Distortion (SMPTE) 0.009 .002 % 60 Hz /7 kHz, 4:1, +4 dBu unity gain
Signal-to-Noise Ratio re +4 dBu, 20 kHz noise bandwidth
120 2dB Mono Outputs, unity gain
98 2dB Mix Outputs, unity gain
Crosstalk
..........L-R Panning 60 (1 kHz) 2 dB Any Input to Mix Outs
..........Channel-Channel 75 (1 kHz) 2 dB Any Input to Mix Outs
Mean Time Between Failure 35,500 hours hMil-Hdbk-217D, Section V
Unit: Maximum Power 7 W
..........Universal Line Voltage 100 to 240 10% VAC 50/60 Hz
..........Conformity CE, FCC, UL
..........Construction All Steel 19" 1U Rackmount
..........Size 1.75" H x 19" W x 5.3" D (4.4 cm x 48.3 cm x 13.5 cm)
..........Weight 5 lb (2.3 kg)
Shipping: Size 4.25" x 20.3" x 13.75" (11 cm x 52 cm x 35 cm)
..........Weight 9 lb (4.1 kg)
Note: 0 dBu=0.775 Vrms Unity Gain = Master Levels Set to ~ “7” Position

SM26S
SPLITTER MIXER
Data Sheet-3
Application Information
Aptly nicknamed the “Swiss Army Mixer”, the SM26S is an
extremely versatile single rack-space tool providing a number of
dierent functions to solve a broad spectrum of line-level signal
routing problems. Whether the need is for line mixing, line
distribution or line matching/amplication, the SM26S easily
performs these tasks, along with additional features for even more
exibility.
One of the most popular uses is line-level mixing for key-
boards, drum machines, and eects. Expanding existing console
limitations is simple. Whenever a mono or stereo sub-mix is
desired, the SM26S comes to the rescue. Up to three stereo, or six
mono sources easily mix together, with panning ability on every
input. Many musical instrument performers nd the SM26S
indispensable for combining various eects and expanding the
available loops on their signal processors.
e SM26S capabilities also include a wide variety of func-
tions such as live recording splitting, -10 dBV to +4 dBm level
matching, intercom splitting, line boosting, hotel and club zone
management, restaurant paging systems, adding additional moni-
tor buses for studio or stage use, and many more custom ap-
plications. Please consult the RaneNote “e SM26S Swiss Army
Mixer” for in-depth applications.
e SM26S provides full expansion capabilities for all applica-
tions. Simple ¼" TRS connectors allow expansion using patch
cords. Using these provisions, an unlimited number of lines may
be mixed or split upon demand. For example, three units create
either an 18 input mixer or an 18 output splitter, or a combina-
tion of both.
Block Diagram

SM26S
SPLITTER MIXER
Data Sheet-4 All features & specications subject to change without notice. 9-2015
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL [phone] FAX [phone] WEB rane.com
the two master inputs, or to allow any mono input to be panned
between the two master outputs.
e inputs and outputs shall be active balanced designs termi-
nated with ¼" TRS (tip-ring-sleeve) connectors. RFI lters shall
be provided. Ultrasonic lters shall be built-in.
e unit shall be capable of operation by means of its own
built-in universal power supply operating at 100-240 VAC and
meet CE requirements (pending). e unit shall be UL and cUL
listed (pending). e unit shall be entirely constructed from cold-
rolled steel.
e unit shall be a Rane Corporation SM26S.
Architectural Specifications
e splitter mixer unit shall have six (6) mono inputs, six (6)
mono outputs, two (2) master inputs, and two (2) master out-
puts. e unit shall be capable of mixing or splitting any inputs
to any outputs simultaneously. Each mono input shall have a level
control with a range of o to +12 dB gain. Separate +12 dB gain
Master Input and Output Level controls shall be provided.
Complete expansion capabilities shall be provided to allow
any number of similar units to be coupled together.
A combination Mix or Pan control shall be provided on each
of the six (6) mono channels to allow any output to be a mix of
Rear Panel

Swiss Army Mixer-1
Introduction
Everyone needs a line level mixer. Even my mother. It
has to be small, and cheap, and versatile. It has to be
able to mix split, distribute, level match, amplify, at‑
tenuate and pan—all without adding any distortion or
noise whatsoever. e mind reels...
And recovers, and discovers the Rane SM26S Split‑
ter Mixer. It is small (1 rack space), extremely versatile,
and affordable. It is a 6 in / 2 out mixer, a 2 in / 6 out
splitter/distribution amplifier, and a 6 in / 6 out buffer
amplifier. It has 12 dB of gain and better than 80 dB
of attenuation. e distortion products are less than
.008% and the noise floor is a trifle 35 microvolts.
Inside this RaneNote is found a gruelingly complete
description of the innards of an SM26S and a patheti‑
cally skimpy introduction to the many possible ap‑
plications of same. Such is my belief that you are the
best judge of how to apply the SM26S once you really
understand its workings.
The SM26S Swiss Army Mixer
• 6 In, 2 Out Mixer
• 2 In, 6 Out Splitter
• 6 In, 6 Out Buffer Amplier
• 4 Channel Stereo Splitter
• Other Applications
Dennis Bohn
Rane Corporation
RaneNote 108
© 1983, 2007 Rane Corporation
RaneNote
SM26S SWISS ARMY MIXER

Swiss Army Mixer-2
Block Diagram
A complete block diagram of the SM26S appears as
Figure 1. (Get your eyeglasses, you may need them.)
Stereo input pairs are accommodated by the individual
LEFT and RIGHT INPUT jacks. Expansion or “daisy
chaining” is possible through the use of the parallel
EXPAND OUT jacks. A dual ganged MASTER INPUT
LEVEL control sets the gain from off to +12 dB for both
Inputs.
From here, the Master Inputs feed a left and right
mixing bus to each of the six MIX pots, as well as going
straight through to the MASTER OUTPUT LEVEL
control stage which feeds the Left and Right Mix
Outputs. e Output from each of the Mix pots feeds
the individual Mono Channel Level stages through a
Figure 1. SM26S Complete Block Diagram
switching contact associated with the MONO IN jack.
(e jacks are drawn in their open, i.e., unused state.
Inserting a plug into the MONO IN jack causes the
auxiliary switch to change position.) e combined left
and right signals go to each of the channel Outputs.
Individual mono inputs enter through the MONO
IN jacks, through the (now closed) auxiliary switch to
the +12dB gain stage where it feeds the MONO OUT
jack. e PAN pot splits the signal into two signals that
feed the LEFT and RIGHT MIX OUTPUTs via the
Master Outputs.
It’s really quite simple. Now let’s look at specific con‑
figurations, leaving out the unused circuitry.

Swiss Army Mixer-3
LEFT
MASTER
INPUT
INPUT
MASTER
RIGHT
RIGHT
EXPAND
OUTPUT
OUTPUT
EXPAND
LEFT
MASTER
INPUT
LEVEL
MASTER
OUTPUT
LEVEL
CH. 1 LEVEL
MONO
OUT 1
OUTPUT
RIGHT MIX
OUTPUT
LEFT MIX
MIX 1
MIX 2 CH. 2 LEVEL
MONO
OUT 2
MIX 3 CH. 3 LEVEL
MONO
OUT 3
MIX 4 CH. 4 LEVEL
MONO
OUT 4
MIX 5 CH. 5 LEVEL
MONO
OUT 5
MIX 6 CH. 6 LEVEL
MONO
OUT 6
LEFT
MASTER
INPUT
INPUT
MASTER
RIGHT
MONO
INPUT 1
RIGHT
EXPAND
OUTPUT
OUTPUT
EXPAND
LEFT
MASTER
INPUT
LEVEL
MASTER
OUTPUT
LEVEL
CH. 1 LEVEL
PAN 1
OUTPUT
RIGHT MIX
OUTPUT
LEFT MIX
CH. 2 LEVEL
INPUT 2
MONO
PAN 2
CH. 3 LEVEL
INPUT 3
MONO
PAN 3
CH. 4 LEVEL
INPUT 4
MONO
PAN 4
CH. 5 LEVEL
INPUT 5
MONO
PAN 5
CH. 6 LEVEL
INPUT 6
MONO
PAN 6
Figure 3. 2 In / 6+ Out Splitter / Distribution Amp
Figure 2. 6+ In / 2 Out Mixer Configuration
2 In / 6+ Out Splitter / Distribution Amplier
Figure 3 shows how the SM26S can be used in the ex‑
act opposite mode as described above. When wired per
Figure 3, the SM26S becomes a 2 In / 6+ Out Splitter/
Distribution Amp. e master stereo signal is con‑
nected to the LEFT and RIGHT INPUT jacks and is
summed via the six MIX pots to each of the MONO
OUTPUTS. e “plus” is that the stereo bus is also
coupled directly through to the LEFT and RIGHT MIX
OUTPUTS. is allows signal translation from ‑10
dBV to +4 dBm or other level related conditioning to
the master stereo bus before feeding other equipment.
6+ In / 2 Out Mixer
Figure 2 diagrams the SM26S signal path when configured as a 6+
In/2 Out mixer. e individual Inputs are connected to each of the
six MONO IN jacks and the combined Outputs are taken from the
LEFT AND RIGHT MIX OUTPUT Jacks. e “plus” comes from
the fact that the LEFT and RIGHT INPUTS also connect to the
LEFT and RIGHT MIX OUTPUTS. ere is no pan capability on
these two Inputs, but each of them does sum with the 6 MONO
INs to produce a 6 plus LEFT to the LEFT OUTPUT and a 6 plus
RIGHT to the RIGHT OUTPUT option if so desired.

Swiss Army Mixer-4
Figure 4. 6 In/6 Out Buffer Amplifier
6 In / 6 Out Buffer Amplier
Figure 4 shows how the SM26S can be used
as a “straight through” line buffer amplifier.
Inputs are brought into the MONO IN jacks
and exit from the MONO OUT jacks. Each
channel has a separate +12dB gain stage with
LEVEL control.
NOTE: One additional channel can be
gained by rotating all the PAN pots fully CW
and using the LEFT INPUT and LEFT MIX
OUTPUT (or rotate tully CCW and use the
RIGHT IN and OUT combination).
MONO
INPUT 1
0 dB
FILTER
RFI
CH. 1 LEVEL
MONO
OUT 1
INPUT 2
MONO FILTER
RFI 0 dB
CH. 2 LEVEL
MONO
OUT 2
INPUT 3
MONO FILTER
RFI 0 dB
CH. 3 LEVEL
MONO
OUT 3
INPUT 4
MONO FILTER
RFI 0 dB
CH. 4 LEVEL
MONO
OUT 4
INPUT 5
MONO FILTER
RFI 0 dB
CH. 5 LEVEL
MONO
OUT 5
INPUT 6
MONO FILTER
RFI 0 dB
CH. 6 LEVEL
MONO
OUT 6

Swiss Army Mixer-5
Figure 5. Splitter Expansion
Figure 6. Mixer Expansion
Expansion
Expanding the input and output capacity of the SM26S
Splitter Mixer is quite easy. Figure 5 shows the proce‑
dure for splitter mode expansion. e Left and Right
Input buses are “daisy chained” using the EXPAND
OUT jacks as shown, and the Outputs are taken di‑
rectly from each SM26S's MONO OUTS.
Mixer expansion is the reverse procedure and ap‑
pears as Figure 6. Inputs are brought into each of the
SM26S’s while their respective LEFT and RIGHT MIX
OUTPUTS are used to cascade the chain by con‑
necting to the LEFT and RIGHT INPUTS of the next
SM26S, and so on.
RIGHT INPUT
LEFT INPUT
1
2
3
4
5
6
TO ANOTHER SM26S...
SM26S
LEFT MIX OUTPUT
RIGHT MIX OUTPUT
RIGHT MIX OUTPUT
LEFT MIX OUTPUT
SM26S
6
5
2
4
3
1
LEFT INPUT
RIGHT INPUT
RIGHT MIX OUTPUT
LEFT MIX OUTPUT
SM26S
6
5
2
4
3
1
LEFT INPUT
RIGHT INPUT
6 x 2
12 x 2
18 x 2
RIGHT INPUT
EXPAND OUT
RIGHT INPUT
EXPAND OUT
RIGHT INPUT
EXPAND OUT
RIGHT INPUT
EXPAND OUT
RIGHT INPUT
EXPAND OUT
RIGHT INPUT
EXPAND OUT
1
2
3
4
5
6
6
4
5
2
3
1
4
6
5
3
2
1
TO ANOTHER SM26S...
SM26S
SM26S
SM26S
2 x 6
2 x 12
2 x 18
LEFT
BUS
RIGHT
BUS

Swiss Army Mixer-6
Figure 7. Level Controls for two MA 3 Amplifiers
Figure 8. Stereo Headphone Mixer
Applications
e SM26S is unusually versatile in its applications.
With the capability to mix 6 Mono Inputs down to one
stereo pair, or split one stereo pair into 6 separate Out‑
puts. or condition 6 Inputs by adding gain or attenua‑
tion—all of this either balanced or unbalanced and able
to drive 600 Ω lines, makes the SM26S truly a “Swiss
Army Mixer”. Further, any combination of the above
can occur at the same time, in the same unit.
1 In / 3 Out +
3 In / 3 Out Combination
For instance. you can split one signal into three sepa‑
rate Outputs with individual LEVEL controls and
use the remaining three MONO INS and OUTS as
buffer/line driving amps. creating a 1‑to‑3 / 3‑to‑3
combination.
6 In / 6+2 Out
Another interesting combination is to use the SM26S
as a 6 In / 6 Out level translation amplifier (infinite cut
to +12 dB boost) and also mix the 6 Mono Inputs down
to one stereo pair with the PAN pots. e stereo Out‑
put appears at the LEFT and RIGHT MIX OUTPUT
jacks.
6+2 In / 2 Out
Or bring 6 Mono and 1 Stereo pair into the
SM26S and add the 6 MONO INs to the stereo pair via
the PAN pots. You now have a 6+2 In / 2 Out situation
with the 6 Mono Inputs still available as 6 buffered
Outputs if needed.
Stereo Headphone Mixer
Figure 8 shows how the SM26S can be used as a
6 In / 2 Out stereo mixer driving the HC 6 Headphone
Console. Six Mono Inputs are brought into the SM26S
where they are mixed together via the PAN pots to
create a stereo output signal at the LEFT and RIGHT
MIX OUTPUT jacks. ese lines are connected to the
MASTER LEFT and RIGHT INPUT jacks of the HC 6
where they drive the six stereo headphone amplifiers.
Zone Amplier Level Controls
Adding individual remote level controls to the MA 3
Multichannel Amplifier is easy with the SM26S as dia‑
grammed in Figure 7. e mono signal is applied to the
LEFT INPUT jack and the 6 balanced MONO OUTS
are connected to the balanced inputs of the MA 3. Ro‑
tating all MIX pots fully CCW routes the Input signal
to each of the MONO OUTS. Each individual Output
is adjusted by its respective channel LEVEL control.
If separate sources are connected to the LEFT and
RIGHT INPUT jacks then the individual MIX pots
will determine which source (or combination of both)
is presented to each of the MONO OUTS. Full CCW
rotation gives Left only; full CW rotation gives Right
only; and the middle position gives equal amounts of
Left plus Right.
LEFT INPUT
SM26S
MA3
MA3
66
55
22
44
33
11
LEFT INPUT1
2
3
4
5
6
HC6S
HEADPHONE
6
HEADPHONE 5
HEADPHONE
2
HEADPHONE
4
HEADPHONE 3
HEADPHONE 1
SM26S
6
5
2
4
3
1
LEFT MIX OUTPUT
RIGHT MIX OUTPUT RIGHT INPUT

Swiss Army Mixer-7
6-to-1-to-6 Mixer Splitter
Figure 9 shows how to use two SM26S’s to
create a 6‑to‑1 mix then a 1‑to‑6 splitter,
to drive the six channels of two MA 3 am‑
plifiers. In just six rack spaces, this con‑
figuration creates a complete six‑channel
mixer zone amplifier system.
e controls of the first SM26S are used to condition
and mix the six Mono Input signals while the controls
of the second SM26S are used to set the individual
Levels of the six amplifiers.
4-Channel Stereo Splitter
Don’t get into the mind trap of thinking of the SM26S
as only a mono splitter mixer. It can function equally
well as a stereo splitter mixer. Figure 10 shows how
to configure the SM26S as a 4‑channel stereo splitter.
e stereo Input pair is brought into the Left and Right
INPUT jacks and then routed via the MIX pots to all of
the Outputs. By setting Channels 1, 3 and 5 for full Left
mix and channels 2, 4 and 6 for full Right mix, you split
the incoming signal into 3 stereo output pairs available
from OUTS 1 & 2, 3 & 4, and 5 & 6 respectively. e
4th stereo Output pair is taken from the Left and Right
MIX OUTPUT jacks as shown. (Note: use of the 4th
independent stereo output requires an internal jumper
modification.)
Stereo mixing is done in the exact opposite man‑
ner. Up to 4 stereo pairs are brought into all Inputs
by connecting one pair to the Left and Right INPUT
jacks and the three remaining “lefts” to Channels 1,
3 and 5, and the “rights” to Channels 2, 4 and 6. Now
by rotating all odd PAN pots fully CCW(Left) and all
even PANs fully CW(Right), you have mixed all 4 pairs
down to 1 master pair available at the Left and Right
MIX OUTPUTs.
Guitar Racks
Figures 11‑13 show three possible ways to connect a
guitar amp to multiple effects. Figure 11 involves buy‑
ing or building a cable that parallels all of the inputs
of the effects so one loop output drives them all. is
works and should cause no great difficulty if the output
impedance of the amplifier loop is low. Outputs of 1k
ohms or less should be able to drive as many effects de‑
vices as you would ever want. A second amplifier could
be used from the other Mix Output of the SM26S for
stereo. Figure 11. Guitar Effects Mixer
MONO IN
MONO IN
MONO IN
SM26S
2
6
5
4
3
1
GUITAR AMP
FROM
GUITAR
LOOP SENDLOOP RETURN
R
R
L
R
L
L
EFFECT 1
EFFECT 2
EFFECT 3
Figure 9. Mixer Splitter
Figure 10. Four Channel Stereo Splitter
LEFT INPUT
SM26SSM26S
6
5
2
4
3
1
LEFT MIX OUTPUT
RIGHT MIX OUTPUT RIGHT INPUT
MA3
MA3
66
55
22
44
33
11
LEFT INPUT 1
2
3
4
5
6
SM26S
RIGHT INPUT
LEFT OUTPUT
RIGHT OUTPUT
STEREO PAIR 1
STEREO PAIR 2
STEREO PAIR 3
STEREO PAIR 4
STEREO
INPUT
PAIR

Swiss Army Mixer-8
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL [phone] FAX [phone] WEB rane.com
DOC 103062
Figure 13. Mono Guitar Effects Splitter/Mixer
Many effects have mono inputs and stereo outputs.
In this case, connect the left and right outputs of Effect
1 to MONO IN CHANNELS 1 and 2 of the SM26S
respectively. Rotate the MIX/PAN control of Channel
1 all the way to the Left and the MIX/PAN of Chan‑
nel 2 all the way to the Right. is preserves the mix of
the effects’ stereo output and passes it to the LEFT &
RIGHT MIX OUTPUTs of the SM26S. Continue with
Channels 3 & 4 for the second effect and Channels 5 &
6 for the last effect. Set the Channel LEVEL pairs to the
same levels to preserve the intended mix of the stereo
effect.
e best way, shown in figure 12, uses one SM26S as
a splitter to actively split the signal into as many as six
separate feeds (or three stereo) for the effects inputs. To
mix all of the effects outputs back together, a second
SM26S connected as a mixer could be enough Inputs
for a mono system, or an SM 82 with eight stereo Inputs
works great for a stereo system.
Now here's a way to split and mix with one SM26S,
shown in Figure 13. From the loop output going to
the LEFT INPUT, Channels 1,2 and 3 will act as the
splitter, with their pan controls all the way to the left
bus. Since the MONO IN jacks know that an individual
Input overrides the master Input…Channels 4,5 and
6 will act as the mixer, with their pan controls all the
way to the right. e RIGHT MIX OUTPUT returns
signal to the amplifier. Cool!
DJ Effects Mixer
DJ mixers have stereo sends and returns, but it’s just
as easy to use the SM26S to combine 3 stereo effects
(or an SM 82 for 8 stereo effects). e concept is the
same as the Guitar Rack in Figure 11, but in stereo. See
Figure 14.
And More
e range of applications of the Model SM26S Split‑
ter Mixer is staggering and have been barely touched
in this RaneNote. From simple sub‑mixing to complex
split‑mix combinations, to individual equipment signal
conditioning, to line splitting, to your unique applica‑
tion, the list of uses for the SM26S goes on and on.
Experiment and have fun!
EFFECT 1
EFFECT 2
EFFECT 3
SM26S
2
6
5
4
3
1
GUITAR AMP
FROM
GUITAR
LOOP SENDLOOP RETURN
LEFT INPUT
RIGHT OUTPUT
(1,2,3 PAN LEFT)
(4,5,6 PAN RIGHT)
SM26S
2
6
5
4
3
1
DJ MIXER
EFFECTS LOOP SEND EFFECTS LOOP RETURN
R
R
L
R
L
R
L
L
PAN R
PAN R
PAN L
PAN R
PAN L
PAN L
R
R
R
L
R
L
L
L RL
EFFECT 1
EFFECT 2
EFFECT 3
Figure 14. DJ Mixer Effects Loop Mixer
Figure 12. Ultimate Guitar Effects Splitter/Mixer
EFFECT 1
EFFECT 2
EFFECT 3
EFFECT 4
EFFECT 5
EFFECT 6
SM82SSM26S
6
5
2
4
3
1
2
6
5
4
3
1
GUITAR AMP
FROM
GUITAR LOOP SENDLOOP RETURN
GUITAR AMP
LOOP RETURN
LEFT OUTPUT
RIGHT OUTPUT