Neumann.Berlin KM 85 i User's Manual
Contents
1. L Ferit Ket O IS ES OT o Cae R A ER AN ey A E a GE L A ha GA E T ae U da a AN En x id E Zo L H E 10000 80203 Operating Instructions for NEUMANN Condenser Microphones of the fet 80 series KM 83 i KM 84 i KM 85 i KM 86i KM 881 KMS 841 Page 1 General 2 2 Overload Protection Switch 4 3 Electrical Source Impedance 6 4 Disassembling of the Microphones and Test Input 6 5 Microphone Versions and Output wiring 9 6 Microphone Cables 10 7 Power Supply 10 8 Battery Operation 11 9 Operation with Unbalanced and Center Tap Grounded Inputs 13 10 Technical Specifications 14 11 Frequency Responses and Polar Patterns 16 12 Accessories 20 April 1984 D 1000 Berlin 61 Charlottenstrasse 3 Tel 30 2514091 Telex 184595 Telegramm Neumannacustic Berlin A A Ths L ET A LK TaN T a s GEE E 1 General All Neumann Condenser Microphones are high quality studio microphones Because of the wide range of different characte ristics available an appropriate Neumann microphone can be found for every applica tion in the broadcasting television film and recording fields The small size makes these microphones especially advantageous The KM 88 i has nickel membranes All other models have gold coated polyester Mylar membranes All microphones mentioned in these instructions operate with 48 V phan tom powering according to DIN 43 296 Detailed information can be obtained from o2. Studio boom on rubber casters three leg ged cast iron base black wrinkle finish lacquer nickel plated tube black lac quered Adjustable from 1 8 m to 2 5 m 6 ft to 8 ft Boom extends from 1 2 m to 2 9 m 4 ft to 10 ft maximum height when set at an angle approx 4 5 m 14 9 1 2 thread swiveling stud for microphone mounting Weight approx 60 kg 132 lbs M 185 Similar to M 184 but its total weight is only 30 kg 66 lbs 22 23 Z 26 Rubber Shock Mount Elastic Mount The Z 26 shock mount is used to prevent mechanical vibration interference between the stand and the swivel mount It has a 1 2 stud and a 5 8 27 female thread A reducer for 1 2 and 3 8 threads is pro vided A 5 8 27 male stud is available Z 26 SG 21 17 Swivel Mount For the swivel mount two plastic clumps with 21 13 16 or 17 mm 11 16 inside diameter respectively are supplied These can be mounted by choice on the socket of the swivel mount and are provided to accept Neumann miniature microphones SG 21 or the microphone cable connector SG 17 SG 21 17 mt Same as SG 21 17 however matt black SG 21 17 mt MNV 87 Auditorium Hanger The MNV 21 auditorium hanger comprises a tilting microphone clamp with an inner dia meter of 21 mm which accepts a Neumann miniature microphone and a cable quide with ring fastener The MNV 21 allows the microphone tilt to be adjusted with the microphone freely suspend
3. The use of an elastic microphone suspen sion is recommended to prevent the micro phone from being exposed to mechanical vibrations caused by shock waves The following elastic suspensions have tilting 5 8 27 female thread A thread reducer for 1 2 or 3 8 studs is included The EA 2124 designates that the diameter of the microphone can be either 21 or 24 mm 13 16 or 15 16 EA 21 mt EA 2124 mt Same as above however matt black 28 29 AT 8 1 i Line Transformer Line transformer 1 1 0 5 m 20 long Switchcraft A3F female connector primary tinned end secondary for 150 250 ohms microphone Max input voltage 300 mV 40 Hz Transmission range 30 16 000 Hz Connects to unbalanced or center tap grounded equipment input This cable transformer is also available with Binder connector and is then reffered to as AT 8 1 Test Adapters The MA test adapters are used to replace the capsule of each microphone when test ing the amplifier A test adapter prevents acoustical interference that would come from a capsule It has the same impedance as the capsule so that the amplifier can be tested under operating conditions giv ing precise values for power drawn gain output capability and weighted as well as unweighted noise voltages The following test adapters are available MA 84 for KM 83 i KM 84 i KM 85 i KMS 84 i microphones MA 86 i for KM 86 i microphone MA 86 for KM 86 microphone MA 88 for KM 88
4. microphone so connected will not work In center tap grounded equipment with in put transformers e g some NAGRA models this ground connection may be lifted with out any negative effect on equipment per formance There are two ways of connecting a phan tom powered condenser microphone to unba lanced amplifier inputs a Insert a high quality AT 8 1 i type 1 1 cable transformer in the outgoing modulation lead Since there exist a great number of different microphone input connectors the secondary side of the cable transformer comes with tinned wire ends see Accessories section b Microphone and power supply may be adapted to unbalanced inputs by means of some minor alterations at our fac tory This is recommended if micropho nes are intended exclusively for use with unbalanced inputs commonly found in semi professional or hometype equip ment 13 FL BL Weight KM 83i KM 84i KM 85i KMS 84i KM 86i KM 88i Acoustical operating Pressure Pressure gradient Pressure gradient Pressure gradient Pressure gradient Pressure gradient principle transducer transducer transducer transducer transducer transducer Polar pattern Cardioid Cardioid Cardioid Omni cardioid Omni cardioid figure 8 figure 8 Frequency range Hz 40 20000 40 20000 40 20000 40 18000 40 20000 40 16000 Sensitivity at 1 kHz mV Pa 7 9 5 6 5 1 Source impedance h 200 200 200 50 200 200 switchable to ons 50 50 50 Minimum load impe
5. The following cables are available for the microphone 103 10 m 33 ft without swivel mount Switchcraft connectors May also be used as extension cable KT 1 10 m 33 ft without swivel mount with 3 pole connectors per DIN 41 524 at both ends May also be used as extension cable These cable are also available with a dark matt connector at the microphone end They are then referred to as IC 3 mt and KT 1 mt respectively Other cable lengths on special order The cable length between microphone and following preamplifier should not exceed 300 m 980 ft The capacitance of grea ter cable length could affect the frequen cy response and in conjunction with the leakage inductance of the microphone s output transformer would result in a rise at the upper end of the frequency range 7 Power Supply The microphones operates on 48 volt phan tom power P 48 IEC 268 154 DIN 45 596 With phantom powering the dc from the po sitive supply terminal is divided via two identical resistors one half of the de Flowing through each audio modulation conductor to the microphone and returning to the voltage source via the cable shield As a consequence the effect of de supply voltage noise superimposed on the micro phone output voltage is reduced by the common mode rejection factor 2 60 dB Phantom powering provides a fully compati ble connecting system since no potential differences exist between the two audio condu
6. extend to 0 7 m 27 1 2 The boom attaches to the 3 8 thread stand stud and has at its end a 3 8 thread stud For mounting the microphone MFS 3i Floor stand with gooseneck weight 5 kg 11 lbs The stand has three legged cast iron base with hammertone lacquer finish The upright tube is nickel plated and is shock mounted to its base to dampen exter nal vibrations Length of the gooseneck is 20 cm 8 the overall height may be ex tended between 1 25 m to 2 05 m 49 to 81 The head of the gooseneck is equip ped to accept a microphone The microphone cable is led out at the base length 10 m E M 255 Folding floor stand with boom with 3 8 threaded stud for microphone fastening The height of the horizontal boom is 0 43 m 17 The boom extends from 0 73 m 291 to 1 4 m 55 so that the height with vertical boom can be adjusted between 0 85 m 33 5 and 1 73 m 68 The stand is suitable for all Neumann miniature microphones The length of the folded stand is 0 85 m 33 5 The weight is 3 9 kg 8 6 lbs black and nickel finish 24 M 210 1 MA Telescoping Fishpole Boom The MA Fishpole consists of 5 kelesco pingfiber glass tubes It can be extended to any working length up to 3 75 m 12 ft 4 in The telescoped length is 1 25 m 4 ft Weight 0 55 kg 1 ib 3 osz An elastic suspension is attached to the front end of the Fishpole permitting the mounting of microphones up to 21 mm 13 16
7. i and KM 85 i microphones the axis of maximum sensitivity is at right angles to the microphone body The front side of the microphone is that side on which the NEUMANN insignia is located Made w Gein wey k KM 84i RAR 5 SS ESE i X ye et a E PUA ae GS ERA a pa No X ne GS E t S Z y ES KM 86 1 mt KM 88 1 In spite of the KM 88 s three pattern switchability omni cardioid and fi gure 8 it is notably small in its out side dimensions The switch is recessed to protect it from inadvertent operation Therefore it is necessary to use a ball point pen or other sharp pointed instru ment to operate the switch The directio nal symbols are engraved on the micro phone housing The diameter is the same as the KM 83 i KM 84 i and the KM 85 i The capsule s dual membranes are metal with a thickness less than 1 jum 0 04 mils A slight boost in the upper part of the fre quency range gives the sound quality pro duced with this microphone a special bril lance The axis of maximum sensitivity is at right angles to the microphone body The front side of the microphone is that side on which the NEUMANN insignia is located KMS 84i The soloist microphone KMS 84 i is espe Cially designed for hand held closetal king applications The direction of maxi mum sensitivity is in line with the axis of the microphone body An acoustical fil ter in front of the condenser capsule and the us
8. in diameter Microphone accesso ries such as a swivel mount and a power supply holder are available The swivel mount permits using the Fish pole as a boom It has a rugged plastic clamp which permits rapid Fastening and removal of the Fishpole Tilt may be varied between 0 and 1800 Connector 5 8 27 thread reducer for 1 2 and 3 8 threads The power supply holder is fastened on to the Fishpole by means of a rugged plastic clamp and accommodates a BS 945 i battery supply Windscreens Open cell polyurethane foam windscreens are available to guard against disturban ces that may be caused by wind close talk applications or rapid boom movements These windscreens have no disturbing reso nances and only slightly affect the fre quency response 1 dB at 10 kHz for the WNS 21 These are the models available for the individual microphones WS 21 WNS 21 KM 83 i KM 84 i KM 85 i KM 88 i WS 86 KM 86 i KMS 84 1 The WNS 21 wind and pop guard is available in black red green yellow and blue Wind noise suppression without electri cal filter WNS 21 18 dB WS 21 23 dB WS 86 30 dB measured in pulsating air currents produ ced by a noiseless wind machine at 20 km h Microphone Case A jeweller s case with insert and metal locking is available as special accessory 30 WNS 21 KHER ESTAIS NU C NES G KES MS EREN NO T SN o zat 31 DS 21 Dual Microphone Mount The DS 21 du
9. This is done by screwing in the three screws located on the microphone head The capsule can then easily be re moved by simply lifting it straight up 2002 502 502 2002 502 5062 2002 502 SHIELD I y Rr gt Change over of Internal Resistance After removing the capsule head turn the three screws located on the bottom of the housing inward and pull the amplifier out the bottom of the housing Re assembly of the microphone is done in reverse order i e the capsule is plugged in last If the capsule is replaced first the ampli fier could bend the thin pins located on the capsule head Be carefull that the cap sule head is not misaligned when attemp ting to assemble it onto the housing Be sure that the three holes at the bottom of the capsule head align with the three set screws in the top of the housing contai ning the amplifier and the screws holding the capsule assembly The amplifier of the soloist microphone KMS 84 1 can be removed after screwing in the three screws towards the connec tors end The capsule head is connected with the amplifier housing by means of a thread From the capsule head the grille can be removed then the elastically sus pended capsule KK 84 is accessible KM 88 i Screws in the Capsule Assembly Ta Holes in the Capsule Housing Set Screws located in the Amplifier Housing Position of the Capsule Connector Attention The isolated elements cl
10. V IEC 6 F 22 Dimensions 120 mm long 4 7 67 mm wide 2 6 24 mm high 0 9 Weight without batteries approx 170 g 6 ozs N 448a Operating voltage 110 V 220 V 10 50 60 Hz Power consumption max 15 VA de voltage output 48 Vt 0 5 V Current output max 100 mA max 50 mA shorted Ripple 0 3 mV mns Fuse 220 V 0 1 A slo blo 110 V 0 2 A slo blo Connector 15 pole male DIN 41612 Mating connector required 15 pole female DIN 41612 100 mm long 4 160 mm wide 6 5 36 mm high 1 4 Weight approx 300 g 11 ozs Dimensions of PC board 12 GW 2448 ka Operating voltage 24 V 21 28 V Current consumption max 230 mA de voltage output 48 Vi1V Current output max 50 mA max 60 mA shorted Ripple 0 1 mVrms Connector 31 pole male S 31 DIN 41 617 31 pole female FL 31 DIN 41 617 100 mm long 4 160 mm wide 6 5 36 mm high 1 41 Weight approx 190 g 7 ozs Mating connector required Dimensions of PC board 9 Operation with Unbalanced and Center Tap Grounded Inputs With phantom powering both modulation leads of the microphone cable as well as the outgoing modulation leads of the power supply are at 48 volt potential This is of no consequence with regard to the ba lanced floating amplifier and console in puts commonly used in studio equipment If however the supply voltage is applied to unbalanced or center tap grounded ampli fier inputs it will be shorted and the
11. al microphone mount provides for a neat arrangement when two Neumann miniature microphones 21 mm diam are required in the same place as is the case in broadcasting applications where a spare microphone is mandatory The dual mount can be attached to table and floor stands as well as to booms It can also be used to combine two miniature microphones and two bent capsule extension tubes into one fixed assembly for stereo recordings The DS 21 fits all stands and booms with 5 8 27 thread An adapter for 1 2 and 3 8 threads is provided DS 21 mt same as DS 21 however matt black Capsule Extension Tubes Capsule extension tubes are available for special applications requiring particular ly unobtrusive placement of the KM 83 i KM 84 i and KM 85 i miniature microphones The extension tubes screw into the micro phone s preamplifier and accept the micro phone capsule at the upper end Models KV 18 KV 38 and KV 58 have bent capsule ends providing for a tilted microphone capsule position with the preamplifier section vertical The extension tube KV 40 is straight and measures 40 cm A typical application for microphones equipped like this is the unobtrusive microphone placement in the footlights or in the wings of a theater and on announe er s desks By means of the elastic sus pension EA 82 the microphone amplifier can be mounted below the table so that only the microphone capsule protrudes EA 21 EA 2124 Elastic Suspension
12. ctors Studio outlets so powered will therefore also accept dynamic microphones and ribbon microphones as well as the mo dulation conductors of tube equipped con denser microphones without the need to switch off the de supply voltage No harm is done even if a phantom power supply is connected to an outlet which is centrally phantom powered 10 AC Supply Operation All P 48 power supplies according to IEC 268 15A and DIN 45 596 are suitable for powering the microphones Current consumption for each microphone in the range of 0 5 mA The Neumann P 48 power supply unit bears the designation N 452 i It is designed to power one or two microphones It operates from 110 V or 220 V 10 power lines Switching of the line voltage is easily accomplished by changing the line fuse which is accessible after removing the supply cover Four screws must be removed for this purpose a Modulation polarity at the power supply output is identical with that at the microphone see chapter 5 It is recommended that a permanently wired central powering be utilized when powering numerous microphones see our bulletin No 10000 808 Central Powering N 448 a ac mains operated central powering unit maximum current output 100 mA Available ver sions plug in PC board as well as various modules dc to de converter using 24 Vde operating voltage Ma ximum current output 50 mA Available versions plug in PC board as various modules Model
13. d Boom extends from 1 1 m to 1 8 m 43 3 to 71 With counterweight for heavy microphones 3 8 thread stud for mounting microphone Weight 4 3 kg 9 7 lbs Nickelplated with black lacquer finish 20 21 M 31 Floor stand with tripod hammertone lac quered cast iron base Weight 4 kg 8 8 lbs Nickel plated tube shock mounted for dampening structure borne vibrations Height adjustable from 1 1 m to 1 8 m 43 3 to 71 The stand is equipped with a reversible thread stud having a 1 2 and a 3 8 thread for mounting the microphone Shorter versions as well as an mt ver sion with a matt black tube are also available M 32 Folding floor stand weight 2 7 kg 6 lbs The lenght of the folded stand is 0 9 m 35 its maximum height is 18 m TIm The stand is nickel plated and has a threaded 1 2 stud for microphone mounting M 35 Extremely stable folding stand nickel plated weight 9 kg 19 8 lbs Maximum height 5 m 16 ft minimum working height 1 4 m 55 lenght when folded 1 65 m 65 The stand has a 1 2 thread stud for mounting the microphone G 35 Boom Attachment Boom attachment for M 35 nickel plated weight 8 kg 17 7 lbs Boom extends side ways to 2 5 m 8 3 With 1 2 stud on swivel joint M 135 Similar to M 35 but with a maximum height of 10 m 32 10 Minimum working height 1 60 m 63 lenght when folded 1 75 m 69 Weight 27 5 kg 60 6 lbs Studio Booms M 184
14. dance ohms 1000 250 1000 250 1000 250 1000 1000 250 1000 250 z 1 S N ratio according to DIN 45590 i d oJ o N a 00 o o ref level 1 Pa w e eee Ok Pe Equivalent loudness dB 27 24 25 17 18 NM On 2 level due to CCIR 468 1 1976 inherent noise dB 2 q O 31 6 30 ae eae wm IEC179 dB Al 20 8 na cN Tor less men with pre B 123 120 120 138 121 124 5 at T KHz attenuationdB 133 130 130 148 131 134 Powereuppiy P48 DIN 45508 METE Current consumption Minimum operating time on battery supply BS 945i hours 15 15 15 15 15 i LO 3 gt P 4 Dimensions Version with diameter 21 21 21 40 21 47 Switchcraft connectors length 110 110 410 477 185 ico Version with Binder diameter mm connectors length 110 110 110 177 175 165 gt 1 Pa 2 94 dB SPL THD of the microphone amplifier when an input level equivalent to the capsule output at the specified SPL is applied suoneosiyioads jed1uydaL OL kHz IU he kHz 125 Hz kH KH 140 180 o a rr ee BkHz e een wow 12 Sk Hz 20000 Hz TS WHIT po S iii I g a t D KMS 84 19 18 11 Frequency Responses and Polar 125 Hz 1kMx Patterns ES S gt LUTT TT AHT CAN TTT HHRHH HH 12 Accessori
15. e of an overloadproof operational amplifier prevent overloads caused by the sub audio parts of sibilants and explosi ves At the same time however the indi vidual speech characteristics of the voca list are transmitted with the brightness typical of condenser microphones The mi crophone capsule is suspended elastically in the microphone head The protecting grille can be unscrewed and replaced with grille available in red yellow green blue dark matt finish and matt satin nickel finish to facilitate microphone identification on stage The microphone is equipped with a KK 84 cardioid capsule 2 Overload Protection Switch On the back of the amplifier housing of yall microphones there is a 10 dB overload switch This switch is recessed and there fore protected from inadvertent operation The microphones can then tolerate sound pressure levels of up to 131 dB Pressure of 71Pa without distortion E KMS 84 i 148 dB Mode agoni 7 KM 88 imt _ 3 Electrical source impedance The KMS has an electrical source impedance of 150 ohms All the other microphones have an electrical source impedance of 200 ohms This can be changed to 50 ohms by soldering connections on the output transformer The input impedance of the Following amplifier should be at least five times as great i e gt 1000 ohms or 2 250 ohms respectively Microphones are delivered normally connected for 200 oh
16. ed from its own cable MNV 21 mt Same as MNV 21 however made of black plastic MNV 21 mt MNV 21 Auditorium Hanger The MNV 87 auditorium hanger is suitable for all makes of microphones using a mi crophone cable with a swivel mount or the SG 21 17 swivel mount It consists of a cable clamp and a stud with which it is screwed into the threaded coupling of the swivel mount The microphone can then be tilted as needed because it is freely suspended from its own cable Available with 1 2 or 5 8 27 thread stud MNV 87 mt Similar to MNV 87 however matt black MKV Swivel Mount This swivel mount can be attached to all microphone stands and allows clamping for all miniature microphones It may be used MKV on stage and for stand and hand held applications of the microphones 26 27 M 252 Folding floor stand with boom attachment The stand tube can be extended twice minimum height 0 65 m 25 5 maximum height 1 6 m 63 The boom attachment extends from 0 32 m 12 5 to 0 64 m 25 Floor stand and boom attachment have a 3 8 threaded stud for mounting the microphone The stand is suitable for all Neumann miniature microphones The length of the folded stand is 0 56 m 22 The weight is 3 2 kg 7 11bs Black and nickel finish N 210 1 Floor Stand with Boom Attachment Floor stand with boom attachment 3 4 kg 7 5 lbs nickel plated Stand is adjus table in height from 0 9 m 35 to 1 6 m 63 boom
17. es Most of the table stands floor stands etc have a 5 8 27 thread An adapter Parts Catalog No 8421400018 can be sup plied to provide campatibility with 3 8 and 1 2 threads l Table Stands MF 1 Table stand with bell shaped cast iron base 0 9 kg 2 lbs 115 mm 4 5 in diameter The stand is black wrinkle finish lacquer and non slip due to a rubber ring attached to the bottom A reversible stud having two different threads permits use of two thread standards Thread combinations 1 2 and 5 8 27 or 3 8 and 5 8 27 MF 2 Table stand solid brass 0 35 kg 60 mm 2 3 8 diameter with isolation against structure born sound for all miniature microphones The stand is matt black lacquer and does not slip due to rubber attached to the bottom Thread stud 1 2 MTS 21 Table stand tripod type with plastic clamp 21 mm 13 16 diameter for mount ing Neumann miniature microphones Floor Stands M 214 1 Extremely stable folding stand Length when folded 1 2 m 4 ft Weight 6 kg 13 lbs Maximum height 2 2 m 87 minimal working height 1 3 m 51 The tripod is black lacquer finished The height adjustable upright is nickel plated and has a 1 2 thread stud for mounting a microphone or the M 212 c boom attachment Floor stand and boom attachment together bear the designation M 212 This unit may be used for all microphones M 212 c Boom Attachment Boom attachment for M 214 1 folding floor stan
18. i microphone If you would like more information on this subjekt ask for the brochure MA Test Adap ters for Condenser Microphones No 10000 806 1 34 als Se Haz E Le sE g PN Z a meson ie MA 84 i with test connector Errors excepted Subject to changes 32
19. ms Those microphones which have been connec ted at the factory for 50 ohms are desig nated with a red dot located on the bottom of the microphone next to the serial num ber To change a microphone to 50 ohms after purchase the microphone must first be opened see chapter 4 4 Disassembling of the Microphones and Test Input All important specifications of the impe dance converter may easily be verified by feeding a test tone to the input of test adapter when this has been installed in place of the capsule head assembly The adapter prevents acoustic interference which would otherwise emanate from the microphone s capsule while at the same time simulating the capsule s impedance This permits the impedance converter to operate with its proper operating para meters See our publication MA Test Adap ters for Condenser Microphones of the fet 80 Series No 10000 806 4 1 Disassembling In order to disassemble the microphones KM 83 i KM 84 i KM 85 i and KM 86 i first turn the three screws located on the lower part of the amplifier housing a few turns to the right i e turning them into the housing The connector with the amplifier can then be pulled downward and out of the housing In so doing it is necessary to slightly depress the overload switch lever After the amplifier has been removed the bridge connections on the transformer can be changed With the KM 88 i microphone first remove the capsule
20. ose to the micro phone capsule and the other extremly high impedance parts are by no means to be touched since even a minimum of dirt or grease may diminish the insulation and cause parasitic leakage voltage 5 Microphone versions and Output wiring These versions are available KM 83 1 Standard version with male KM 84 i 3 pole connector insert as per KM 85 i IEC 268 12 Requires Switch KM 86 i craft A3F female connector KM 88 i XLR type KMS 84 i Microphones wired per IEC 268 12 pin conn 130 x IEC 02 or DIN 45 599 I respecti vely Modulation is connected to pins 2 and 3 the shield to pin 1 A sudden sound pres sure rise in front of the front membrane causes a positive voltage to appear at pin 2 KM 83 i mt KM 84 i mt KM 85 i mt As above but with KM 86 i mt dark matt finish KM 88 i mt KMS 84 i mt As special versions are available KM 83 with male 3 pole connector KM 84 insert per DIN 41 524 Requires KM 85 Binder 09 0006 00 03 or Tuchel KM 86 3261001 female connectors KM B8 KMS 84 Microphone wired per DIN 45 599 N Modu lation is connected to pins 1 and 3 the shield to pin 2 As sudden sound pressure rise in front of the front membrane causes a positive voltage to appear at pin 1 KM 83 mt KM 84 mt KM 85 mt KM 86 mt KM 88 mt KMS 84 mt As above but with dark matt finish The portable power supplies for the microphones Type i carry also the suffix i 6 Microphone Cables
21. s GW 2448 ka and N 448 a are improved later models of the discontinued GW 2448 k NK 48 a or N 448 respectively GW 2448 ka 8 Battery Operation Neumann condenser microphones also be operated from batteries using the BS 945 i battery supply This battery supply provides 48 volt phan tom powering for any of the fet 80R series condenser microphones It requires two ordinary IEC 6 F 22 9 volt batteries which may be readily obtained everywhere The 48 volt potential required is produced by a dc converter Battery life depends mainly on the type of battery used It is at least 15 hours operating time for most fet 80 series microphones Decreasing battery voltage is indicated by a flashing LED The use of mercury batteries increa ses battery life fourfold Instead of bat teries rechargeable NiCd batteries may be 11 used They may be recharged via the built in charging jack in the power pack using a Beyer Dynamic SLG 150 180 battery char ger Modulation polarity at the power supply output is identical with that at the mi crophone Technical Specifications N 452 1 Operating voltage 110 V 220 Vi 10 50 60 Hz Power consumption max 5 VA de voltage output 2x48 93 V Currrent output max 2x10 mA Ripple 0 2 Mims Dimensions 135 mm long 5 3 125 mm wide 5 65 mm high 2 6 Weight approx 750 g 1 65 lbs BS 945 Operating voltage 18 V de voltage output 48 vta4ay Maximum current output 1 mA Batteries 2x9
22. ur information leaflet Compatible Cen tral Powering for Neumann Condenser Micro phones of the fet 80 Series No 10000 80801 KM 83i KM 84i and KM 851 Externally these three microphones are identical All three capsules are inter changeable simply by screwing them onto the same amplifier The KM 83 i is omni directional the KM 84 i and the KM 85 i are both cardioids The KM 85 i incorpora tes a low frequency roll off which reaches about 12 dB at 50 Hz This microphone is therefore much less sensitive to low fre quency interference which may be encounte red outdoors or in public address applica tions while at close talking range the characteristic low frequency boost present in all pressure gradient transducers is compensated The linear admittance cha racteristic of the KM 84 i and the KM 85 i units provides for unalterated sound qua lity regardless of the direction from which the sound impinges on the microphone KM 86i Two back to back individual capsules per mit the three directional characteristics omni cardioid and figure 8 to be electri cally selected by means of a switch loca ted below the capsule head The KM 86 i is especially noteworthy in that it reprodu ces low frequencies equally well for all three directional characteristic even at a great distance from the sound source High frequency response is virtually li near both in the diffuse as well as the Free sound field In contrast to KM 83 i KM 84
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