Shure SCM410 Bedienungsanleitung

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SCM410 SCM410E -- Four-Channel Micro-

phone Mixer

Safety Information

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 dry cloth.

7. DO NOT block any ventilation openings. Allow sufficient distances for adequate ventilation and install in accor-

dance with the manufacturer’s instructions.

8. DO NOT install near any heat sources such as open flames, radiators, heat registers, stoves, or other appara-

tus (including amplifiers) that produce heat. Do not place any open flame sources on the product.

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. 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.

10. PROTECT the power cord from being walked on or pinched, particularly at plugs, convenience receptacles,

and the point where they exit from the apparatus.

11. ONLY USE attachments/accessories specified by the manufacturer.

12. 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.

13. UNPLUG this apparatus during lightning storms or when unused for long periods of time.

14. REFER all servicing to qualified service personnel. Servicing is required when the apparatus has been dam-

aged 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. DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled with liquids, such as vas-

es, on the apparatus.

16. The MAINS plug or an appliance coupler shall remain readily operable.

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17. The airborne noise of the Apparatus does not exceed 70dB (A).

18. Apparatus with CLASS I construction shall be connected to a MAINS socket outlet with a protective earthing

connection.

19. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.

20. Do not attempt to modify this product. Doing so could result in personal injury and/or product failure.

21. Operate this product within its specified operating temperature range.

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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 user-ser-

viceable 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 SCM410/E is a four-channel automatic microphone mix-

er for use in sound reinforcement, audio recording, and broadcast applica-

tions. The SCM410 dramatically improves audio quality in any application

where multiple microphones are required. Any low-impedance dynamic or

condenser microphone (including wireless) can be used with the SCM410.

Multiple SCM410 mixers can be linked to other SCM410 mixers, as well as

to Shure Models FP410, SCM810, and SCM800.

Each input channel has a two-band equalizer and three logic terminals.

The equalizer reduces unwanted low-frequency audio pickup and makes

different microphone types-lavaliers, boundary and handheldsound similar.

The logic terminals can be used to control external devices.

The SCM410 operates on 100-120 Vac power and the SCM410E operates

on 220-240 Vac power. Each mixer is supplied with a power cord, rack-

mounting hardware, and a link cable.

Features

•Fast, noise-free microphone selection, which automatically adjusts to changes in background noise

• Automatic gain adjustment as additional microphones are activated- NOMA (Number of Open Microphones At-

tenuated)

•Last Mic Lock-On circuit maintains ambient sound

•Fits in half-rack space

•Adjustable EQ for each channel

•Active balanced microphone-level XLR inputs and an active balanced Mic/Line level XLR output

•Unbalanced auxiliary-level phono output

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•Bi-color channel activation and clipping LEDs

•Peak-responding output limiter with LED indicator

•Peak-responding output level meter

Operating Principles

The operating concept behind the SCM410 Automatic Mixer is Shure's proprietary IntelliMix® circuitry. Intellimix

delivers seamless automatic mixing by combining three separate functions:

•Noise Adaptive Threshold. Distinguishes between constant background noise (such as air conditioning) and

changing sound (such as speech) for each input channel. It continuously adjusts the activation threshold so that

only speech levels louder than the background noise activate a channel.

•MaxBus. Controls the number of channels that may be activated for a single sound source. One talker activates

only one channel, even if multiple microphones “hear” that talker.

•Last Mic Lock-On. Keeps the most recently activated microphone open until another microphone is activated.

Without Last Mic Lock-On, a long pause in conversation would cause all microphones to turn off, which would

sound as if the audio signal had been lost. Last Mic Lock-On ensures that background ambience is always

present.

IntelliMix is a registered trademark of Shure Incorporated.

Front Panel

Microphone Channel Gain Controls 1 - 4

Allows adjustment of microphone gain.

Input LED 1 - 4

Lights green when channel is active; lights red at 6 dB below clipping level.

Low-Cut Filter 1 - 4

Provides adjustable low-frequency rolloff (high pass), reducing presence of undesirable low-frequency signals.

High-Frequency Shelving Filter 1 - 4

Provides level boost or cut in mid/high-frequency region for reduced sibilance from vocal microphones, or to com-

pensate for off-axis coloration in lavalier microphones.

Output Level Meter

Six-segment LED meter indicates peak output signal level in dBu (0 dBu = 0.775V). The red LED illuminates when

the output is 6 dB below clipping. The last LED indicates limiter action.

MASTER Level Control

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Controls overall output level.

POWER LED

Lights green when mixer is plugged into a power source.

POWER Switch

Turns the mixer on and off.

Note: Country dependant

Rear Panel

Power Connector

Unit is energized when the power cord is plugged into a 100-120 Vac (SCM410) or 220-240 Vac (SCM410E) pow-

er source. NOTE: There is no power On/Off switch on this mixer.

DIP Switch

The 4-position DIP switch provides additional functions. Refer to the “DIP Switch Functions”section.

Microphone Logic Connector

High density DB-15 male connector provides connection to GATE OUT, MUTE IN, and OVERRIDE IN logic termi-

nals on each channel. Refer to the “Advanced Functions” section.

Note: This is not a VGA monitor port.

AUX OUT Phono Connector

Feeds consumer-level audio equipment, such as a tape recorder, VCR, or video camera. Not affected by MIC/

LINE switch.

MIC/LINE XLR OUTPUT Connector

Can be set for microphone or line-level output via a DIP switch.

LINK IN/OUT Connector

Permits multiple SCM410/E, FP410, SCM810, SCM800, or AMS8100 mixers to be linked, creating additional in-

puts.

MIC LEVEL XLR INPUT Connectors

Active balanced microphone-level XLR inputs. For instructions on how to modify the level of these inputs, refer to

the “Internal Modifications” Addendum.

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DIP Switch Functions

The rear panel DIP switches, shown in Figure 1, provide the functions listed in the table below.

Last Mic Lock-On XLR Output Level Limiter 12V Phantom Pow-

Switch Number 1 2 3 4

Switch Up All mics off after

hold time

Mic Level ON ON

Switch Down ON* Line Level OFF* OFF*

* Factory setting

Last Mic Lock-On

Keeps the most recently activated microphone turned on until another microphone is activated. When defeated,

microphones turn off after their default hold time. XLR Output Level: Sets the level of the XLR output to line or mi-

crophone level. Make sure the output level matches the input level of the device connected to the SCM410.

Note: The output level does not affect the auxiliary output (AUX OUT) level.

Limiter

Activates the output limiter and sets it to a default threshold of +16 dBu (see Internal Modifications Addendum for

other threshold settings).

12V Phantom Power

When this switch is in the ON position, the SCM410 provides 12Vdc phantom power to each XLR microphone in-

put. This function is particularly useful when using condenser microphones, since most condenser microphones

require phantom power.

Note: Phantom power does not affect the operation of balanced dynamic microphones. They can be connected to

the SCM410 in combination with condenser microphones that use phantom power. For instructions on how to dis-

able phantom power by channel, refer to the Internal Modifications Addendum.

Installation

Rack Mounting

The SCM410 is supplied with hardware for mounting one or two units to a 19-inch audio equipment rack. The

hardware can also be used to rack mount other Shure products, including the SCM268, SCM262, DFR11EQ, and

the DP11EQ.

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Single Mixer (Half Rack) Installation

1. Attach the short and long rack-mount brackets to the SCM410/E with eight (8) of the supplied bracket screws.

INSTALLING HALF RACK MOUNTING BRACKETS

2. Place the mixer in an equipment rack and secure it with the supplied rack-mount screws and plastic washers.

RACK MOUNTING A SINGLE SCM410/E MIXER

Dual Mixer (Full Rack) Installation

1. Place the two mixers side-by-side and connect them with two (2) straddle brackets. The brackets should strad-

dle the recessed edges on the top and bottom of each mixer.

INSTALLING STRADDLE BRACKETS

2. Fasten the straddle brackets using eight (8) bracket screws.

3. Attach the short rack-mount brackets to the outsides of the combined mixers with eight (8) of the bracket

screws.

INSTALLING FULL RACK MOUNTING BRACKETS

4. Place the mixer in an equipment rack, using the supplied rack-mount screws and plastic washers.

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RACK MOUNTING DUAL SCM410/E MIXERS

Table-Top Mounting

Adhere the four (4) supplied rubber feet to the bottom of the mixer at each corner. This will keep it from sliding and

protect the table surface.

ATTACHING RUBBER FEET FOR TABLE-TOP MOUNTING

Fixed Mounting

Top Mount

1. Fasten the straddle brackets to the recessed edges of the chassis, using four (4) bracket screws.

INSTALLING STRADDLE BRACKETS FOR TOP MOUNTING

2. Fasten the straddle brackets to the top of the mounting surface, using the four (4) supplied wood screws.

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SECURING MIXER TO TOP MOUNTING SURFACE

Hanging Mount

Note: The hardware provided is for attachment to wood. Other surfaces require the use of appropriate hardware

rated for 15 lbs. or more.

1. Fasten the straddle brackets to the top of the mixer.

INSTALLING STRADDLE BRACKETS FOR HANG MOUNTING

2. Fasten the straddle brackets to the bottom of the mounting surface, using the four (4) supplied wood screws.

SECURING MIXER TO BOTTOM MOUNTING SURFACE

SCM410 Connections

1. Connect microphone signal sources to the Channel Input connectors. Use conventional 2-conductor shielded

audio cables.

2. If any condenser microphones are connected, set the +12V phantom power DIP switch to ON.

3. Connect the SCM410 Mic/Line Level Output to the input of mixers, EQs, amplifiers, or recorders.

4. Connect the power cord to 100-120 Vac (SCM410) or 220-240 Vac (SCM410E)

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Linking Multiple Mixers

If more than four inputs are needed, multiple Shure SCM410, FP410, or SCM810 mixers can be linked by connect-

ing the LINK OUT of the first mixer to the LINK IN of the next mixer, and so on. See Figure 2. Leave the LINK IN

jack of the first mixer and the LINK OUT jack of the last mixer unconnected.

When properly linked, the mixers will operate as a system. Automatic mixing functions will be shared by all units.

All input signals appear at all linked mixer outputs. Each mixer's Master level control only controls its own output.

However, actual off-attenuation will increase as more mixers are linked. This reduces excessive noise and rever-

beration contributed by the increased number of microphones.

Important: When using logic terminals on linked mixers, connect the LOGIC GROUND terminals of each

unit together.

Note: SCM410 link connections are unbalanced. To minimize hum and noise, avoid using longer link cables. Use

high quality, shielded cable, and keep them away from sources of magnetic or electrical noise, such as power

transformers or light dimmers. To minimize ground currents, make sure linked mixers are connected to the same

AC power mains.

FIGURE 1: LINKED SCM410 AND SCM810 MIXERS

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