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Swiss Army Mixer-

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. The mind reels...

And recovers, and discovers the Rane SM 26B 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. The distortion products are less than 

.009% and the noise floor is a trifle 35 microvolts.

Inside this RaneNote is found a gruelingly complete 

description of the innards of an SM 26B 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 SM 26B once you really 

understand its workings.

The SM 26B Swiss Army Mixer

•   6 In, 2 Out Mixer

•   2 In, 6 Out Splitter

•   6 In, 6 Out Buffer Amplifier

•   4 Channel Stereo Splitter

•   Other Applications

Dennis Bohn

Rane Corporation

RaneNote 108

© 1983 Rane Corporation

RaneNote

SM 26B SWISS ARMY MIXER

Summary of Contents for SWISS ARMY SM 26B

Page 1: ...fer amplifier It has 12 dB of gain and better than 80 dB of attenuation The distortion products are less than 009 and the noise floor is a trifle 35 microvolts Inside this RaneNote is found a gruelingly complete description of the innards of an SM 26B 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...

Page 2: ...and Right Mix Outputs The Output from each of the Mix pots feeds the individual Mono Channel Level stages through a Figure 1 SM 26 Complete Block Diagram switching contact associated with the MONO IN jack The 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 The combined left and right signals go to each of the chan...

Page 3: ...xact opposite mode as described above When wired per Figure 3 the SM 26B becomes a 2 In 6 Out Splitter Distribution Amp The master stereo signal is connected to the Left and Right input jacks and is summed via the six Mix pots to each of the Mono Outputs The plus is that the stereo bus is also coupled directly through to the Left and Right Mix Outputs This allows signal translation from 10 dBV to ...

Page 4: ... 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 I...

Page 5: ...M 26B s while their respective Left and Right Mix Outputs are used to cascade the chain by connect ing to the Left and Right Inputs of the next SM 26B and so on RIGHT INPUT LEFT INPUT 1 2 3 4 5 6 TO ANOTHER SM 26B SM 26B LEFT MIX OUTPUT RIGHT MIX OUTPUT RIGHT MIX OUTPUT LEFT MIX OUTPUT SM 26B 6 5 2 4 3 1 LEFT INPUT RIGHT INPUT RIGHT MIX OUTPUT LEFT MIX OUTPUT SM 26B 6 5 2 4 3 1 LEFT INPUT RIGHT IN...

Page 6: ...vailable as 6 buffered Outputs if needed Stereo Headphone Mixer Figure 8 shows how the SM 26B can be used as a 6 In 2 Out stereo mixer driving the HC 6 Headphone Console Six Mono Inputs are brought into the SM 26B where they are mixed together via the PAN pots to cre ate a stereo output signal at the LEFT and RIGHT MIX OUTPUT jacks These lines are connected to the MAS TER LEFT and RIGHT INPUT jack...

Page 7: ... 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 ...

Page 8: ...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 The 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 SM 26B to com...

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