CM-311A CM-311AE
Contents
1. CM 311A CM 311AE s U BTI 53 z wio 1 we D3 06 Fat W3 R13 ay c12 s D 2 Tod ot T T pc 0 c9 100 R29 og SHIELD w4 7 on 1 R24 880 07 MICROPHONE CAPSULE 03 vec c14 R16 L SHIELD W8 vec 02 Acos ri2 0 Aig R25 R28 4 015 l R20 R2 8 WHT W9 H go R21 R26 xE p Sp 6 4 1 8 R18 2 R23 R11 UIE 1 R9 MICROPHONE ELECTRONICS CM 311A Schematic We B c5 ul 8 R2 c6 orgi f 84 jp WS 02 N 1 1 R3 R6 D1 c4 smeo M T WE Sieg CM 311AE Schematic SCOUT Crown International Inc PO Box 1000 Elkhart IN 46515 1000 TEL 219 294 8000 FAX 219 294 8FAX 2000 Crown International Inc Specifications subject to change without prior notice Crown and Differoid are registered trademarks of Crown International Inc 02 00 102546 4 CM 311A CM 311AE for touring and live sound applications the Crown CM 311A is a rugged head worn microphone with unequalled performance It sounds like the best handheld microphones tull clear and distortion free even with the loudest singers The CM 311A is the latest version of the Crown s pro2. Frequency Response Polar Response 415 330 30 10 FRONT 2 0 1 375 5 A 48 0 TH TNO e 5 tlh 4 10 4 2 270 dow gt 25 27 35 7 Niz 20 100 1K 10K 20K 7 Frequency in Hz REAR N 210 180 150 Fig 3 Fig 4 HEADBAND TOP VIEW 1 06 in 2 7 cm BOOM wt BLOCK L 1 MIC 5 5 13 97 3 745 SIDE VIEW WIRE FRAME 9 5 cm EARPIECE a THUMBSCREW AND BLOCK REMOVEABLE gt i WINDSCREEN 7 17 78 cm RETAINING RING 1 3 7 62 cm 2599 6 6 Fig 5 EARPIECE HEADBAND WIRE FOAM BLOCK WIRE FOAM BLOCK THUMBSCREW DETAIL TO MOVE MIC TO MOVE MIC DOWN IN OR OUT Gn Sip TO MOVE MIC LEFT OR RIGHT 3 Now bend the headband wire to fit your head Put the foam block wire behind your ear Then you can bend the earpieces to fit snugly around your ears The back of the headband should fit firmly against the back of your neck 4 Next adjust the foam pad snug against your head or neck To do this bend the wire that goes into the foam block CAUTION Do not bend the boom itself just the foam block wire A snug fit of the foam pad pre vents boom bounce when you move around 5 Be sure that the thumbscrew is still loos ened a little Move the boom in or out and left or right to center the mic directly in front of
3. CM 311A 3 pin pro audio XLR type CM 3171AE supply your own to match your transmitter Cables CM 311A 2 conductor shielded unbalanced cable 42 inches 106 68 cm from headband to battery pack Use 2 conductor shielded mic cable not included between XLR connector and mixer mic input Cable CM 311AE In line with this cable is a small circuit module that equalizes the microphone signal Cable is 42 inches 106 68 cm long from headband to module 12 inches 30 48 cm from module to cable end 2 conductor shielded unbalanced cable unterminated Materials High impact plastic mic housing brass boom steel wire headband high impact plastic and steel battery pack Finish Satin black Net weight Head worn mic 2 1 oz 61 g CM 311A belt pack and battery 6 1 oz 1730 Dimensions Headband 5 5 inch 13 97 cm diameter adjustable Boom approximately 7 inch 17 78 cm x 3 inch 7 62 cm See Figs 3 and 4 Included accessories Microphone carrying case WS 6 foam pop filter clothing clip Optional accessories PH 4B phantom power supply 4 channels AC powered PH 1A phantom power supply 1 channel battery or AC adapter powered WS 14 accessory windscreen 1 pascal 10 dynes cm 10 microbars 94 dB SPL Fig 1 Fig 2
4. e programmed to work in three ways Push on push off Momentary on Momentary off as supplied To change the switch operation open the belt pack case by removing the three screws Set the switch as shown below TO XLR PUSH ON MOM OFF MOM ON PUSH OFF COUGH P T T The LED lights when the mic is on How to connect the CM 311AE to a wire less transmitter 1 Solder on a connector that mates with your transmitter Technical Bulletin 3 in cluded shows the correct wiring for various transmitters A wireless transmitter must have separate leads for ground audio and bias 3 9 volts 2 Plug in the cable Adjust the trim pot on the transmitter input to prevent distortion Architects and Engineers Specifications The microphone shall be the Crown Model CM 311A or equivalent The microphone shall be a head worn noise cancelling cardioid type of electret condenser design The microphone shall exhibit excellent off axis response and gain before feedback The microphone shall have an adjustable headband adjustable boom with locking thumbscrew and foam pop filter Model CM 311A shall include a battery belt pack Model CM 311AE shall be the head worn microphone alone In the CM 311A a 42 inch permanently attached two conduc tor shielded cable shall connect the micro phone to the belt pack The belt pack shall include a 3 pin pro audio XLR type con nector In the CM 311AE a 42 inch pe
5. prietary Differoid technology Its cardioid pickup pattern rejects sounds from the rear such as floor monitors Its noise canceling ability rejects sounds at a distance such as instruments on stage and crowd noise This results in the CM 311A having outstanding gain before feedback and isolation Lightweight and comfortable the mic s headband and boom adjust to fit any singer An included pop filter greatly reduces breath noise and pops Because of the boom s unique behind the ear design it does not cover up the singer s face Two models are available CM 311A and CM 311AE The CM 311A is powered by a 9V battery or phantom power It has a battery belt pack with an on off switch a programmable mic on off switch and a Mic LED The CM 311AE is a pig tail version allowing you to connect it to the wireless transmitter of your choice How to adjust for best fit and to prevent boom bounce Note To get maximum the performance out of this microphone take the time to adjust it to fit correctly For best results the CM 311A MUST be custom fitted to a single user s head This simple procedure takes only a few minutes Please refer to Fig 5 and locate the parts described 1 If the microphone is for yourself we suggest that you use a mirror to double check the fit as you make adjustments 2 Loosen just a little the thumbscrew located on the outside of the foam block part way back on the boom This allow
6. rma nently attached two conductor shielded cable can be connected to a transmitter Model CM 311A shall be powered by a 9V battery in the belt pack or by 18 to 48V phantom power The belt pack shall have a battery on off switch a programmable mic on off switch and a Mic On LED Model CM 311AE shall be powered by 3 9V DC from a transmitter Nominal open circuit sensitivity shall be 4 or 1 25 mV Pa Maximum SPL shall be 148 dB SPL for 3 THD Equivalent noise shall be 27 dBA nominal Frequency response shall be 50 Hz to 17 000 Hz with a uniform off axis response over 20 dB down at the rear null The Crown models CM 311A and CM 311AE are specified Microphone Warranty Crown professional microphones are guar anteed unconditionally against malfunction from any cause for a period of three years from date of original purchase See en closed warranty sheet for additional infor mation Service If the microphone does not function prop erly check that it is aimed correctly and is connected as described in this data sheet If the microphone is defective return it in the original packaging to Crown Service De partment Plant 2SW 1718 West Mishawaka Road Elkhart IN 46517 For further assistance or technical support call 800 342 6939
7. s the boom to slide in and out and to rotate left and right DIFFEROID HEAD WORN CONDENSER MICROPHONE Specifications Transducer type Electret condenser Frequency response typical 50 Hz to 17 000 Hz see Fig 1 Polar pattern Cardioid see Fig 2 Impedance CM 311A 75 ohms balanced CM 311AE 6 kilohms unbalanced Recommended load impedance CM 311A 1000 ohms or greater CM 311AE 10 kilohms Open circuit sensitivity typical close talking CM 311A 4 mV Pa 48 dB re 1V Pa CM 311AE 1 25 mV Pa 58 dB 1V Pa Power sensitivity typical close talking 311 42 5 dB 1 mW Pa CM 311AE 71 5 dB re 1 mW Pa Equivalent noise level self noise 26 dB SPL typical 0 dB 0 0002 dyne cm A weighted S N ratio 68 dB at 94 dB SPL Maximum SPL CM 311A 148 dB SPL produces 3 THD CM 311AE 140 dB SPL with 3V DC 148 dB SPL with 9V DC Operating voltage CM 311A 9V DC internal alkaline battery or 18 48V phantom power CM 311AE 3 9V DC from the transmitter s battery Polarity Positive pressure on diaphragm produces positive voltage on CM 311A XLR pin 2 with respect to pin 3 and on CM 311AE shield with respect to white lead Current drain 311 6 5 mA nominal CM 311AE 0 27 mA nominal Battery life 311 85 hours CM 311AE approximately equal to transmitter battery life Off attenuation 70 dB Output connectors
8. your lips The foam pop filter should press firmly against the lips This is necessary because the mic cancels sounds that are not close to it Also it keeps the boom from bouncing Tighten the thumbscrew and you re done Once you ve adjusted the headset it should remain in that position no further adjust ments are needed You can still swing the mic up or down away from your lips if you don t want to be heard on the P A or use the mic on off switch programmed for oress off operation After several hours of use the foam pop filter can become clogged with moisture giving a muffled sound Periodically wash it in mild detergent and water The foam pop filter is held in place by a removable ring Additional WS 6 pop filters can be ordered from Crown s Parts Department How to insert a battery in the CM 311A belt pack 1 Access the battery by sliding open the battery cover 2 Insert a fresh 9V alkaline battery Mallory Duracell 9100 or equivalent into the battery tray The battery cover shows the correct polarity 3 Replace the battery cover To prolong battery life turn off the battery switch when not in use If you re using phantom power and the battery switch is on the battery will take over automatically if phantom power fails After 85 hours of use or if the sound is distorted it s time to replace the battery How to program the mic on off switch The mic on off switch can b
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