background image

1/15

SCM800 -- Eight-Channel Microphone Mixer

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.

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.

Summary of Contents for SCM800

Page 1: ...t 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...

Page 2: ...t channels Each input chan nel has a two band equalizer switchable microphone or line level operation switchable 48 V phantom power and a inch send receive insert jack The SCM800 operates on 120 Vac power the SCM800E operates on 230 Vac power Both models are supplied with rack mounting hardware link cable and removable block terminal connectors An accessory rack panel adapter Model RKC800 availabl...

Page 3: ...n of off axis lavalier microphones or for cutting the high frequency sibilance of vocal microphones 5 AUX Level Control Sets the input level for aux level equipment connected to the adjacent inch phone jack INPUT or rearpanel inch AUX input 6 AUX INPUT inch Phone Jack Mixes external auxiliary or line level sources i e tape recorders into output Signal appears at output of all linked mixers 7 MASTE...

Page 4: ...vable Block Connector Active balanced line level signal for connection to amplifiers recorders or other mixers If necessary output level can be changed to microphone level Refer to the Internal Modifications section of this manual 15 SEND RECEIVE inch Insert Jacks Post fader post EQ insert point to add external compressor limiter graphic or parametric EQ or other signal processors Tip is send ring...

Page 5: ... SCM800 E CONNECTIONS Refer to Figure 5 and proceed as follows 1 Connect microphone or line level signal sources to the Channel Input connectors use conventional two con ductor shielded cables 2 Insert a screwdriver or similar tool into the slot above each block connector and adjust the input slide switch as required microphone level left position 48 V phantom power center position or line level r...

Page 6: ...er threshold settings Switch es 5 and 6 change the output limiter threshold to OFF default setting 16 dBm 8 dBm or 4 dBm Other set tings are as shown in the table at right Refer to the Internal Modifications section of this manual for additional set tings NOTE Switches 1 2 3 4 and 7 are inactive and are not used OUTPUT LIMITER THRESHOLD DIP SWITCH FIGURE 3 DIP SWITCH FUNCTIONS ...

Page 7: ... mixer s output See Internal Modifications to defeat the linking of Aux signals Link jacks should be connected sequentially theLINK OUTof one mixer to the LINK IN of the next leaving one LINK OUT and one LINK IN unconnected NOTE Each doubling of the number of linked mixers decreases the master output level by 6 dB LINKING MULTIPLE SCM800 E MIXERS FIGURE 6 LINKING TO OTHER SHURE AUTOMATIC MIXERS An...

Page 8: ...are available from Apple Computer as computer printer connections they are variously referred to by Ap ple as shielded serial cable with two mini DIN 8 connectors and Apple System Peripheral 8 Cable BASIC MIXER OPERATION 1 Turn on the Power switch 2 Adjust each channel level so that its Overload LED flickers only during very loud speech or noise 3 Turn unused channel controls full counterclockwise...

Page 9: ...ff point is defined as the frequency where the signal has dropped 3 dB relative to the flat or bandpass region Below the cutoff point the filter exhibits increasingly more attenuation as the frequency diminishes The rate at which this attenuation oc curs is defined in decibels per octave dB oct The SCM800 has a one pole low cut highpass filter of 6 dB per octave Low cut filters are ideally used fo...

Page 10: ...erve as a jumper between adjacent jumper pads All Channel modifications in this section use Channel 1 as an example Inserting A 15 dB Microphone Preamplifier Pad Each channel s microphone preamplifier gain can be reduced by 15 dB This may be desirable with extremely high output microphones To pad the gain of the MIC position 1 Remove surface mount resistor R1023 2 Solder a 680 Ω resistor at jumper...

Page 11: ...indicates the resistor value to be used for the desired gain Master Section Gain Resistance 6 dB 5 1 kΩ 0 10 kΩ 6 dB 20 kΩ Procedure 1 Short jumper X901 2 Remove resistors R900 and R909 Change Limiter Threshold All three threshold settings 16 8 and 4 dBm can be changed To shift the threshold down by 6 dB resistor Rwill be 82 kΩ To shift the limiter thresholds up by 6 dB R will be 330 kΩ Procedure ...

Page 12: ...om Radio Design Labs 1 800 281 2683 or www rdlnet com Procedure For channel control 1 Connect the tip of a in connector to the line input of the VCA and the sleeve to the ground of the VCA 2 Connect the ring to the line output of the VCA 3 Plug the in connector to the Insert jack of the SCM800 4 Set the channel level control should be set to 5 For Aux In control 1 Connect the external source to th...

Page 13: ...trols full counterclockwise Master full counterclockwise 90 dBV Master full clockwise 62 dBV Common Mode Rejection Ratio 70 dB at 1 kHz Polarity Mic Line Send inputs to all outputs are non inverting Aux input to all outputs is inverting Overload and Shorting Protection Shorting outputs even for prolonged periods causes no damage Microphone inputs are not damaged by signals up to 3 V Lines and Moni...

Page 14: ...inal 50 60 Hz 200 mA SCM800E 230 V AC rated nominal 50 60 Hz 100 mA Temperature Range Operating Temperature 0 to 60 C 32 to140 F Storage Temperature 30 to 70 C 22 to158 F Dimensions 44 5 mm H x 483 mm W 317 mm D 1 x 19 x 12 in Net Weight 4 3 kg 9 lb 9 oz Replacement Parts Knob Channel Gain and Phones white 95A8238 Knob Master blue 95B8752 Line Power Cord SCM800 95B8389 230 VAC Power Line Cord 95B8...

Page 15: ... bear CE Marking Conforms to European EMC Directive 2004 108 EC Meets Harmonized Standards EN55103 1 1996 and EN55103 2 1996 for residential E1 and light industrial E2 environments This product meets the Essential Requirements of all relevant European directives and is eligible for CE marking The CE Declaration of Conformity can be obtained from www shure com europe compliance Authorized European ...

Reviews: