SCM268
Four-Channel Microphone Mixer
The Shure four-channel microphone mixer, SCM268, user guide.
Version: 5.2 (2022-I)
Table of Contents
SCM268  Four-Channel Microphone Mixer3 IMPORTANT SAFETY INSTRUCTIONS3 General Description4 Features                                                                            4 Front Panel                                                                          4 Rear Panel                                                                        5 Gain Control                                                                        6 Input Gain                                                                          6 Output Gain                                                                      6 Output Level Meter                                                            6 Phantom Power6 Output Level Switch                                                          7 Connections                                                                        7Installation8 Supplied Hardware                                                            8 Rackmount Installation                                                      9 Internal Modifications                                                      11 Internal Modifications11 Disassembly11 Low-Cut Filter                                   
                              12 Phantom Power Disable                                                  13 Line Pad                                                                          13 Hot Mic Pad                                                                    13 Specifications14 Optional Accessories and Replacement Parts              15 Optional Accessories                                                      15 Replacement Parts                                                          15 Certifications15
1.2.3.4.5.6.7.8.9.
10.11.12.
13.14.15.16.17.18.19.20.21.SCM268
Four-Channel Microphone Mixer IMPORTANT SAFETY INSTRUCTIONS
READ these instructions.KEEP these instructions.HEED all warnings.
FOLLOW all instructions.
DO NOT use this apparatus near water.CLEAN ONLY with dry cloth.
DO NOT block any ventilation openings. Allow sufficient distances for adequate ventilation and install in accordance with the manufacturer’s instructions.
DO NOT install near any heat sources such as open flames, radiators, heat registers, stoves, or other apparatus (in­cluding amplifiers) that produce heat. Do not place any open flame sources on the product.
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. The wider blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replace­ment of the obsolete outlet.
securing
PROTECT the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
ONLY USE attachments/accessories specified by the manufacturer.
USE only with a cart, stand, tripod, bracket, or table specified 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.
UNPLUG this apparatus during lightning storms or when unused for long periods of time.
REFER all servicing to qualified 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.
DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled with liquids, such as vases, on the
apparatus.
The MAINS plug or an appliance coupler shall remain readily operable.The airborne noise of the App
aratus does not exceed 70dB (A).
Apparatus with CLASS I construction shall be connected to a MAINS socket outlet with a protective earthing connec­
tion.
To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
Do not attempt to modify this product. Doing so could result in personal injury and/or product failure.
Operate this product within its specified operating temperature range.
This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit.
••••••
•This symbol indicates that there are important operating and maintenance instructions in the literature accom­panying this unit.
WARNING: Voltages in this equipment are hazardous to life. No user­serviceable parts inside. Refer all servicing to qualified service personnel. The safety cer­tifications do not apply when the operating voltage is changed from the factory setting.
General Description
The Shure Model SCM268 is a transformer­balanced, four­channel microphone mixer. Its simple, compact design delivers su­perior performance and exceptional sound quality with low noise and a flat frequency response.
Versatile in all types of applications, the SCM268 integrates transformer-balanced XLR inputs, a switchable microphone/line level transformer-balanced XLR output, phono jack inputs and output, phantom power, and an auxiliary input channel. It can function as a primary or add-on mixer for sound reinforcement, recording, broadcast, or audio-visual presentation systems. With the supplied hardware, the mixer's half-rack chassis mounts securely in single or dual rackmount installations. For fixed installations, the SCM268 can be fastened on or below a shelf, counter, or tabletop.
Features
Four transformer-balanced microphone inputs
Transformer-balanced output-switchable mic/line level
Five -10 dB line-level inputs
Six-segment LED output level meter
Built-in 12-volt phantom power
Internal power transformer
Built-in low-cut filter on microphone inputs (below 80 Hz)
Front Panel
① Gain Controls (1-4).
Adjusts gain for microphone level inputs and auxiliary level inputs 1-4.
② Auxiliary Channel Gain Control (AUX IN).
Adjusts the auxiliary channel input gain.
③ Output Meter.
LED meter indicates peak output signal level.
④ Master Gain Control (MASTER).
Adjusts overall output level.
⑤ Power Indicator (POWER).
This LED illuminates when the unit is plugged in and receiving power.
The SCM268 does not have a power switch. To turn the unit off, unplug the power cord or use an external power strip with a switch. However, it can remain plugged in as it uses very little power when idle.
⑥ POWER Switch
Country dependent.
Rear Panel
① Power Connector.
Accepts 100-120 Vac (SCM268) or 220-240 Vac (SCM268E).
② Output Connector (MIC/LINE OUT).
Transformer-balanced XLR output connector. Switchable between line and microphone level.
③ Output Level Switch (MIC/LINE OUT).
Recessed switch changes the signal level of the XLR output connector: In = Microphone Level. Out = Line Level.
④ Auxiliary Output Connector (AUX OUT).
RCA output feeds consumer-level audio equipment. Not affected by MIC/LINE switch.
⑤ Auxiliary Input Channel (AUX IN).
A dedicated auxiliary-level input for the auxiliary channel.
⑥ Auxiliary Level Inputs (AUX LEVEL INPUTS, 1-4).
RCA inputs connect to consumer-level audio sources.
⑦ Phantom Power Switch (12V PHANTOM).
Recessed switch turns on phantom power for microphone inputs 1-4.
⑧ Microphone Level Inputs (MIC LEVEL INPUTS).

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