SM26S Mic / Line Mixer

SM26S Splitter / Mixer

Features

  • 6 balanced mono inputs, 6 balanced mono outputs
  • 2 main balanced Inputs, 2 main balanced outputs
  • 6 input Level controls with 6 Mix / Pan controls
  • Master Input and Output Level controls
  • 10 dBV to +4 dBu shifter
  • +4 dBu to –10 dBV shifter

Applications

  • 6 mono input mixer with a stereo output
  • 4 stereo input mixer with a stereo output
  • 1 stereo input with 6 mono outputs splitter
  • 1 stereo Input with 4 stereo outputs splitter
  • 6-in, 6-out booster amplifier
  • Configurable to 8 outputs

SM26S Splitter / Mixer

The Rane Model SM26S Splitter Mixer is one of the most useful, yet unusual audio products available.

In its most basic configuration, 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. The 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. The 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.

The SM26S may also be used as a six input, six output buffer amplifier in which case signal applied to Input 1 is delivered to Output 1, and so on.

The 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.

The front of the SM26S comprises a Master Input Level control, six Channel Level controls, six Mix/Pan controls and a Master Output Level control. The 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 1/4" TRS active balanced.

Block Diagram

SM26S Block Diagram

SM26S Applications

 

SM26S Swiss Army MixerAptly nicknamed the “Swiss Army Mixer”, the SM26S is an extremely versatile single rack-space tool providing a number of different functions to solve a broad spectrum of line-level signal routing problems. Whether the need is for line mixing, line distribution or line matching/amplification, the SM26S easily performs these tasks, along with additional features for even more flexibility.

One of the most popular uses is line-level mixing for keyboards, drum machines, and effects. 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 find the SM26S indispensable for combining various effects and expanding the available loops on their signal processors. Here's an example of a 576-channel music mixing system using daisy-chained SM26 and SM82 Mixers.

The SM26S capabilities also include a wide variety of functions 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 monitor buses for studio or stage use, and many more custom applications.

The SM26S provides full expansion capabilities for all applications. Simple 1/4" 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 combination of both.

The question arises regarding mic levels. Since the SM26S operates only at line levels, microphone applications require separate boosting before connection. Rane offers a mic stage model MS1S ideally suited to this application. The MS1S is a single channel mic preamplifier with a true differential input and balanced output. This provides the ability to locate the mic preamp close to the mic’s location and run a line signal to the SM26S. For installations requiring rack-mounting, the ML 1 provides two mic preamplifiers.

SM26S Literature

Each unit is shipped with a booklet containing all of the above, the RaneNote "Sound System Interconnection," Declaration of Conformity, and Rane's 2+ Year Warranty information.

SM26S Support

I read that the SM26S can be a 2 x 4 distribution ampliifer, but the Mix Ouputs are summing all the inputs. What is wrong?

If an SM26S 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 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 in the manual. WARNING: Remove the top cover only after the power is off! Don't attempt this If you aren't qualified to service the unit.

Are the inputs and outputs balanced?

On both the SM 26, 26B and the current 26S all inputs are fully balanced. The first model SM 26 has only balanced inputs, the outputs are single-ended (some say quasi-balanced) with an ungrounded "floating" sleeve connection. For typical applications this is not a limitation, just a consideration for wiring and RF rejection. The SM 26B has been in continuous production since 1994, replacing the SM 26. The "S" version has a new internal universal power supply, operating from 100-240 VAC (true for all Rane "S" models).

When I split and mix simultaneously there is phase cancellation at the MIX OUTPUTS, what's wrong?

Due to the summing node being inverting there is a combination of hookups which will produce phase cancellation due to signal inversion. Remove the internal jumpers (six total) to rectify this situation. Only SM 26B and SM26S units have these jumpers, they were not part of the original SM 26 design.

If the above doesn't answer your question:
Phone the Rane Factory at 425-355-6000, 8:30 AM to 5 PM PST, Monday to Friday.
Email is answered most weekdays from the Rane Factory Contacts.
The Rane Forum may have the answer you need.
USA Service and Warranty is listed by State.
International Service is listed by Country.

Other Rane Rackmount Mixers

MODEL DESCRIPTION RACK SPACES CONNECTORS
AM1 Automixer, 4 Mic / Line In, RCA line in, USB audio I/O, RAD Port 1 XLR XLR, RCA RCA, RCA USB, XLR RJ-45
AM2 Automixer, 8 Mic / Line In, Cascadable, RAD Port 1 XLR XLR, XLR RJ-45
MLM42S Mixer, 4 Mic / Line In, EQ, Effects Loop, 2 Out 1 XLR XLR, 1/4" 1/4" TRS
MLM82S Mixer, 4 Mic / Line In, 4 Mono / Stereo In, 2 Out 1 XLR XLR, 1/4" 1/4" TRS
MLM 65 Mixer, 6 Mic / Line In, 6 Stereo Line In, USB Audio I/O 3 XLR XLR, RCA RCA, RCA USB, TOSLINK, S/PDIF
MLM103 Mixer, 6 Mic / Line In, 2 Stereo In, 3 Out 3 euro Euro
SM82S Mixer, 8 Stereo Line Inputs With Aux Sends 1 1/4" 1/4" TRS, 1/4" 1/4" TS

Other Splitter / Distribution Amplifiers

MODEL DESCRIPTION RACK SPACES CONNECTORS
DA216S Distribution Amplifier, 2 Mic / Line In, 16 Line Out 1 euro Euro
DA26S Distribution Amplifier, 1 Mic In, 1 Line In, 6 Line Out 1 euro Euro
Mongoose Router, 32 In x 32 Out, Programmable, Audio over Ethernet 1 XLR RJ-45

The MS1S adds a small, portable and simple mic preamp to the SM26S.

The ML 1 adds a pair of mic preamps or digital outputs to the SM26S in a rackmount unit.

SM26S Splitter / Mixer