Shure Microphone SM80 User's Manual
Contents
1. Model A81WS and a compact lightweight microphone stand Model S15 capable of being extended to 4 3m 14 ft A dual channel power supply Model PS1A is available for providing phantom power to the SM80 Model SM80 Features m Wide range frequency response for exceptionally accurate recording and sound reinforcement appli RELATIVE RESPONSE IN dB cations Low noise and high output clipping level char 20 50 109 naei et 10 000 20 acteristics Low distortion characteristics over the entire audio TYPICAL FREQUENCY RESPONSE spectrum for a wide range of load impedances FIGURE 1 Polar Pattern a Omnidirectional polar pattern is equally sensitive to Omnidirectional see Figure 2 sounds from all directions a Very low RF susceptibility Selectable low frequency response flat 6 or 18 dB octave rolloff 10 dB attenuator accessible without disassembly lockable in either position m Wide range phantom powering includes DIN 45 596 voltages of 12 and 48 Vdc Rugged construction for outstanding reliability Field usable over wide range of temperature and humidity conditions O oO m 2 S az P m O oO za gt re O o Z Oo m Z m Pe O a O gri x O a m m O L O gt rr w gt gt VARIATIONS TYPICAL POLAR PATTERNS Model SM80 LC Supplied less cable2. The weight shall be 230 grams 8 02 The microphone shall be capable of being powered by a phantom simplex power supply with an output of 11 to 52 Vdc or by a mixer audio console or tape recorder capable of supplying 11 to 52 Vdc The microphone shall be a Shure Model SM80 FURNISHED ACCESSORIES Pop Filter Grille oo ccccccceeceseecssesneseeeeaeees A81G Swivel Adapter ccccccccceesseeesetiesenieeees A57D 10 dB Attenuator LOCK wo ttt 34A830 OPTIONAL ACCESSORIES Unidirectional Microphone Cartridge R104 Phantom Power Supply ccccccccssccssteesseestseeees PS1A Heavy Duty Windscreen cn A81WS Tripod Microphone Stand 4 3m 14 ft oe 15 Cable 7 6m 25 ft XLR connectors C25F REPLACEMENT PARTS Grille and Cartridge Assembly 0 cee R104A 10 dB Attenuator Actuator Ring 31B1334B 10 dB Attenuator Switch Assembly 0 90B2883 Low Frequency Response Switch Knob 65A1218A PC Board Assembly and Support 0 00 ee 90B3820 kandle tusiert sneer nana ett acncn A A Moneaitet 31B1392B RFI Filter and Plug Element aa 90A3622 GUARANTEE This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from date of purchase Please retain proof of purchase date This guarantee is in lieu of any and all other guarantees or warranties express or implied and there shall be no recovery for any consequential or in
3. FIGURE 2 Copyright 1986 Shure Brothers Incorporated Printed in U S A 27A1743 FF Patent Pending Output Impedance Rated at 150 ohms 85 ohms actual Recommended minimum load impedance 800 ohms May be used with loads as low as 150 ohms with reduced clipping level Output Level at 1 000 Hz Open Circuit Voltage oe 65 dB 0 56 mV 0 dB 1 volt per microbar Equivalent Power Level cceeen 40 5 dB 0 dB 1 milliwatt with 10 microbars Clipping Level at 1 000 Hz BO0 OMM LOA csoro onneasi 4 dBV 0 63V 150 OhM LOA eee 15 dBV 0 18V Total Harmonic Distortion Less than 0 5 132 dB SPL at 250 Hz into 800 ohm load Maximum SPL at 1 000 Hz 137 dB attenuator at 0 147 dB attenuator at 10 with 800 ohm load 129 dB attenuator at 0 139 dB attenuator at 10 with 150 ohm load Hum Pickup 4 dB equivalent SPL in a 1 millioersted field 60 Hz Output Noise equivalent sound pressure levels 17 dB typical A weighted 20 dB typical weighted per DIN 45 405 Signal to Noise Ratio 77 dB IEC 179 at 94 dB SPL Overvoltage and Reverse Polarity Protection Max External Voltage Applied to Pins 2 and 3 with Respect to Pind ou 52 Vdc Reverse Polarity Protection nccc 200 mA max diode clamped Phasing Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 Cartridge Capacitance 31 pF LF Response Switch Flat 6 dB octave below 100 Hz 18 dB octave below 80
4. for the configuration in Figure 4 could be 3 6k Two 3 6k resistors should be closely matched 2 or better and may be mounted externally with the B end connected to the 30V terminal The resistors may also be mounted internally such modifications should be performed by qualified service personnel only A convenient method of battery powering the SM80 using two 9 volt batteries is shown in Figure 8 Note INPUT FROM OUTPUT TO MICROPHONE MIXER 7 i C INSI4 4 on marae IFLR 2000 BATTERY POWER SUPPLY FIGURE 8 that this circuit can on y be used with balanced floating ungrounded transformer coupled input mixers such as the Shure M67 or SE30 The resistors should be 1 tolerance or better to assure close matching With new batteries this supply will operate an SM80 for approx imately 200 hours LOW FREQUENCY RESPONSE SWITCH The SM80 has a three position low frequency response switch located on its handle The switch is recessed to avoid accidental movement but may be easily moved with the fingertips The user may select either flat response low frequency rolloff of 6 dB per oc tave below 100 Hz or low frequency cutoff of 18 dB per octave below 80 Hz see Figure 1 ATTENUATOR RING The SM80 has a switchable 10 dB capacitive atten uator to prevent high sound pressure levels from over loading the microphone s internal electronics The attenuator is engaged by rotating the actuator ring directly below
5. Hz Attenuator Switch 0 or 10 dB 68 pF Power Supply Voltage 11 to 52 Vdc positive pins 2 and 3 Current Drain dnei N 1 0 mA to 1 2 mA Environmental Conditions Relative Humidity 0 50 wee 29 to 74 C 20 to 165 F Relative Humidity 0 95 wn 29 to 57 C 20 to 135 F Connector Professional three pin audio Case Steel construction with metallic vinyl paint finish and stainless steel screen Dimensions See Figure 3 242 mm 8 11 32 in ie 23 5mm 20 1mm 5 16in 25 32in OVERALL DIMENSIONS FIGURE 3 Weight Net iaat r R daa 230 grams 8 02 Packaged vicinus titi niiiayd 1 2 kg 2 Ib 10 oz S N ratio is difference between microphone output at 94 dB SPL and microphone self noise A weighted Designed to mate with Cannon XL series Witchcraft A3 Q G series or equivalent connectors OPERATION The SM80 is designed for phantom powering by a Shure Model PS1A Power Supply or by virtually any microphone power supply providing 12 to 48 Vdc phan tom voltage Use only high quality cables as intermittent shorts between broken shield wires and balanced conductors will cause extremely large noise transients in the system Avoid ground loops due to grounded connector shells or the microphone case touching other grounded metal objects Follow generally accepted audio ground ing practices Paralleling or Y ing the SM80 with another micro phone two microphones on the sa
6. IGURE 9 WIND NOISE The excellent frequency response of professional condenser microphones such as the SM80 makes them quite sensitive to wind breath and air currents from ven tilation equipment The resulting low frequency micro phone output may cause mixer overload or other prob lems The Model A81G Pop Filter Grille attenuates breath popping sounds when the microphone is close talked and permits its use outdoors with minimal pickup of rushing and rumbling sounds Slip the A81G over the SM80 until the inside of the A81G touches the top of the microphone Tighten the A81G by rotating the knurled collar clockwise from the bottom When removing the A81G loosen the knurled collar first otherwise the cartridge will unscrew with the A81G For outdoor use under very windy conditions the Model A81WS Heavy Duty Windscreen is recom mended CIRCUIT DESCRIPTION A block diagram of the SM80 is shown in Figure 10 The capacitor cartridge is followed by a _ switch con trolled capacitive attenuator stage which provides for 10 dB attenuation at the cartridge output The signal is fed to a field effect transistor FET impedance con version stage The FET output drives an active low frequency response high pass filter controlled by a three position switch The filter output from a com pound transistor Class A emitter follower amplifier is transformer coupled providing a balanced output to the RFI protection filter at the microphone co
7. S 222 HARTREY AVE EVANSTON IL 60202 3696 U S A AREA CODE 312 866 2200 e CABLE SHUREMICRO THE SOUND OF THE PROFESSIONALS PROFESSIONAL PROD UCTS GENERAL The Shure Model SM80 is a high quality omnidirec tional condenser microphone designed for the most demanding professional applications in studio record ing broadcasting and sound reinforcement It is especially suitable for applications requiring extremely wide frequency response low noise and distortion characteristics very low RF susceptibility and reliable operation over a wide range of temperature and humid ity extremes The SM80 features a selectable 10 dB attenuator and a three position low frequency response switch The case is constructed of steel for ruggedness with a stainless steel screen and finished in durable vinyl paint The SM80 is designed for phantom simplex power ing from an external supply such as the Shure Model PS1A or directly from recording broadcast or sound reinforcement equipment The SM80 operates over a wide voltage range covering both DIN Standard 45 596 phantom voltages of 12 and 48 volts SPECIFICATIONS The microphone is supplied with a highly efficient Type pop filter grille Model A81G attenuator lock and Omnidirectional condenser electret bias swivel adapter Also available for use with the SM80 are Frequency Response a unidirectional microphone cartridge Model R104 a 20 to 20 000 Hz see Figure 1 heavy duty windscreen
8. alue is not critical Note that the two resistor phantom power supply Figure 5 presents a load equal to 4R paralleled with the mixer input impedance to the SM80 If the combined parallel load is below 800 ohms the transformer configuration Figure 6 is recommended and if the combined load is 150 ohms or less it must be used If the power supply is unregulated the power supply voltage may drop when the SM80 is connected to it due to the added load To account for this load the value of R may be determined as follows Connect a variable resistance or resistor substitution box in series with a 10 kilohm 10 resistor Connect the free end of the 10k resistor to ground and the free end of the variable resistor to B of the power supply Adjust the variable resistor until 12 to 36 volts is measured across the 10k resistor Note the actual dc supply voltage and the value of the variable resistor Verify that the resistor value falls with the indicated range on the graph of Figure 7 The value of the variable resistor is the appropriate resistance R for use in Figure 6 If the configuration in Figure 5 is to be used double the resistor value 2R Voltages as low as 10 Vdc minimum as measured at the microphone connector are acceptable The nominal cur rent drain at 10 Vdc is 1 1 mA This is the minimum cur rent a power supply must be able to deliver for proper operation For example in mixers with 30 Vdc power supplies the value of 2R
9. cidental damages SHIPPING INSTRUCTIONS Carefully repack the unit insure it and return it prepaid to Shure Brothers Incorporated Attention Service Department 222 Hartrey Avenue Evanston Illinois 60202 3696 If outside the United States return the unit to your dealer or Authorized Shure Service Center for repair The unit will be returned to you prepaid
10. e switch assembly and replace it with the new value Take care not to touch the switch assembly with the solder ing iron To remove possible contamination after soldering wash the entire switch assembly in a mild detergent solution rinse it in distilled water soak it in alcohol to remove the water and allow it to air dry Reassemble the SM80 Note the new attenuation value on the SM80 attenuator ring with a small label MIXER OVERLOAD The SM80 output is about 15 dB higher than most dynamic microphones in order to provide optimum signal to noise ratio When used at moderate to high SPLs this additional output may overload the mixer input A resistive attenuator can be inserted in the microphone line ahead of the mixer to minimize this The Shure Model A15AS Attenuator 15 20 or 25 dB switch selectable is specially designed for use with condenser microphones A convenient 15 dB attenuator design is shown in Figure 9 The resistors shown are 1 2 watt 1 tolerance and the circuit may be pack aged in a Switchcraft S3FM adapter housing The 15 dB attenuator can be used between the SM80 and the PS1A or other power supply or between the PS1A and the mixer Two of these attenuators may be used in series to provide 30 dB of attenuation Note that commercially available 150 ohm attenuators such as the Shure Model A15A are not recommended due to loading OUTPUT TO MIXER INPUT FROM MICROPHONE 15 dB ATTENUATOR CIRCUIT F
11. lle and cartridge assembly coun terclockwise from top 2 Lift the 10 dB attenuator actuator ring up and over the screw threads 3 Grasp the center contact of the 10 dB attenuator switch assembly and lift upward to remove it 4 Turn the slotted head screw near the plug coun terclockwide inward as far as it will go Using a long nose pliers grasp one pin of the three pin con nector and withdraw the RFI filter and plug element from the handle 5 Remove the low frequency response switch knob by placing a small screwdriver or tweezers into the slot under the ridge of the knob and lifting outward 6 Remove the small Phillips screw near the plug Tap the cartridge end of the handle gently on a firm sur face the printed circuit board and support assembly will slide out of the cartridge end ARCHITECTS SPECIFICATION The microphone shall be a condenser microphone with a frequency response of 20 to 20 000 Hz It shall have an omnidirectional pickup characteristic The microphone shall have a rated output impedance of 150 ohms for connection to microphone inputs of 150 ohms or higher The open circuit voltage shall be 65 dB 0 56 mV 0 dB equals 1 volt per microbar The microphone shall contain a three position low frequency response switch and a lockable 10 dB at tenuator pad The overall dimensions shall be 212 mm 8 11 32 in in length by 23 5 mm 15 16 in in diameter The handle diameter shall be 20 1 mm 25 32 in
12. me input is not recommended separate inputs are preferable However paralleling two SM80 s may be accomplished with either a reduction in maximum SPL and output level or a reduction only in output level if the micro phones are electrically isolated With the microphones paralleled either before or after a PS1A Power Supply the maximum SPL is reduced by approximately 10 dB and the output level by 6 dB The reduction in maximum SPL can be avoided by using either two Shure A15AS At tenuators and a Switchcraft 391Q43 Y Adapter to isolate the microphones or an isolation network as shown in Figure 4 The network reduces each micro phone output level by 8 dB while the A15AS reduces the output level by 5 dB plus the attenuator s 15 20 or 25 dB switch selectable The network or attenuators can be inserted between the power supply outputs and mixer input or between two microphones and a single power supply input Note that a PS1A Power Supply can power two SM80 s on each input other power supplies should be checked to see if they can supply a minimum of 10 Vdc at each microphone when both microphones are connected A minimum load impedance of 800 ohms or greater should be used for maximum signal handling and minimum distortion The load may be as low as 150 ohms but a reduction in output clipping level will result It should be noted that the power supply itself may add loading 3300 ohms in the Shure PS1A Power Supply to the micro
13. nnector An active constant current power supply circuit regulates the phantom voltage allowing the SM80 to operate over a very wide range of voltages A reverse voltage protec tion diode guards against miswired cables and equip ment The circuit contains five semiconductors to pro vide low noise low distortion wide frequency response and ultra reliable operation over a very wide range of operating conditions CAPACITOR CARTRIDGE FET IMPEDANCE CONVERTER LF RESPONSE FILTER CAPACITIVE ATTENUATOR CLASS A COMPOUND AMPLIFIER BALANCED TRANSFORMER RFI FILTER REGULATOR REVERSE VOLTAGE PROTECT BLOCK DIAGRAM FIGURE 10 SERVICING TROUBLESHOOTING Due to the high packing density and circuit com plexity of the SM80 only basic servicing is recom mended The following steps should be taken if problems arise 1 Check the power supply output voltage to the microphone For the Shure PS1A this should be 21 5 1 5 Vdc open circuit 2 Check the voltage on microphone connector pins 2 and 3 at back of connector cable connector disassembled from shell but connected to micro phone The voltage at pins 2 and 3 with reference to pin 1 should be between 10 and 48 Vdc 3 If more than one SM80 is available interchange car tridge assemblies to determine whether the car tridge or amplifier is at fault DISASSEMBLY The SM80 can be disassembled as follows 1 Unscrew the gri
14. phones ALL RESISTORS 232 OHMS ISOLATION NETWORK FIGURE 4 PS1A POWER SUPPLY Connect the microphone cable to the SM80 and the power supply MICROPHONE connector The power sup ply uses the balanced audio cable pair to carry the sup ply current to the microphone and the cable shield as a ground return Connect the power supply OUTPUT connector to a low impedance microphone input of the mixer audio console or tape recorder A second SM80 may be con nected to the remaining power supply channel in a similar manner ALTERNATE POWER SOURCES As an alternate to the PS1A power supply the SM80 may be phantom powered from virtually any mixer audio console or tape recorder using one of the wiring configurations shown in Figures 5 and 6 Any well filtered voltage available in the mixer from 12 to 48 Vdc may be used The graph in Figure 7 shows the range of values which can be used for resistor R when the SM80 is used with a regulated power supply The tolerance of the resistors 2R shown in Figure 5 should be 1 or INPUT FROM MICROPHONE O30 Q OUTPUT R TO MIXER TWO RESISTOR CONFIGURATION FIGURE 5 INPUT FROM MICROPHONE Da CENTER TAPPED TRANSFORMER CONFIGURATION FIGURE 6 OUTPUT TO MIXER R RESISTOR R IN KILOHMS 12 16 20 24 28 32 36 40 44 48 VOLTAGE V IN VOLTS RESISTOR R VALUES FIGURE 7 better to assure close matching although the absolute v
15. the grille assembly In the 10 position the output of the microphone is reduced by 10 dB in creasing the maximum sound pressure level at clipping by 10 dB The attenuator ring may be locked in either the O or 10 position as follows Unscrew the grille and car tridge assembly by unscrewing counterclockwise from the top Turn the actuator ring to the O or 10 position as desired Insert the actuator ring lock small curved piece of plastic in the area behind the actuator ring be tween the pin and the edge of the slot thereby preven ting the ring from turning Replace the grille and car tridge assembly The amount of attenuation can be increased by changing the value of the capacitor in the 10 dB at tenuator switch assembly Note that this change must be done carefully and with subsequent cleaning to avoid possible signal to noise degradation Unscrew the grille and cartridge assembly counterclockwise from top Lift the 10 dB attenuator actuator ring up and over the screw threads Grasp the center contact of the 10 dB attenuator switch assembly and lift upward to remove it Obtain a 5 NPO monolithic ceramic capacitor Centralab MONO KAP CN series or equivalent of the required value for the desired attenua tion Attenuation Capacitance 15 dB 150 pF 20 dB 270 pF 25 dB 560 pF 30 dB 001 uF Using long nose pliers and a low wattage pencil type soldering iron carefully remove the capacitor from th
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