Neumann.Berlin KM 56c User's Manual
Contents
1. CONDENSER MICROPHONE KM 56c APPLICATION The condenser microphone KM 56c belongs to a family of high quality miniature micropho nes which were developed to meet the spe cial requirements of modern recording tech niques It is widely used in broadcasting televi sion and film studios as well as in disc recording and high quality public address systems Since the directional characteris tics of this microphone can be altered by means of a switch it is particularly use ful where different types of recording problems are to be solved with one and the same microphone Its small physical size enables it to be used unobtrusively This makes it ideally suited for use in the centre of a round conference table as an omnidirectional microphone As a cardioid microphone the KM 56c is ca pable of rejecting unwanted noises from the back of film and television studios It will enable first rate recordings to be ma de in acoustically unfavourable conditions KM 56c 910 02 01 GEORG DEONANY gt LADORATORHDVO ELEUTAQARUSTIM GABE BERLIN SWG MESM 202 Feb 65 Printed in Germany FEATURES The main feature of the KM 56c is thatin spite of its minia ture constructions its directional characteristic can be switched to omni directional cardioid or figure of eight The switching is effected by turning a ring at the base of the microphone The direction of operations is radi2. INTERCONNECT CABLE Standard length Diameter Weight o ooooo Connector 0 0 0 0 0 0 2 0 9 0 000 Connector with universal joint coupling for screw ing onto stand Thread 9 0 0 0 ee 9 119 127 220 240 Volts AC 310 80 mA for 117 127 V or 50 mA for 220 240 V mT according to DIN 41 571 Stabiliser 150 B 2 Valvo App 11 Watts 5 mA 100 mA 120 V 4 V lt 10 pV and 8 UV Rafi 110 V No 2855 220 x 100 x 100 mm 2 2 kg KC 2 10 m App 5 mm 420 g T 3400 1 Tuchel NT 3401 Tuchel V2 and 5 8 27 TPI TECHNICAL MICROPHONE KM 56c Acoustical system transducers DETAILS Combination of two pressure gradient electrically switchable for omni directional cardioid figure eight Frequency range Output levels Omni Cardioid app 40 15 000 cps app Figure of eight app Electrical load resistance 0000 0 SE 0 0 0 0 0 0 0 0 0 Electrical source resistance Capacitance capsule Stray voltage vv 9 o 0 0 Noise voltage Maximum sound pressure for 5 distortion at 40 cps 1 keps and 5 KROD8 enc cima Gain of microphone amplifier at 1000 cps Valves 0 0 0 0 9 0 0 060000000 Dimensions 200 00 9 900 Weight E S 0 0 0 0 20 0 0 0 0 5 0 00 0 ee gt 1000 250 a 200 50 a 20 2 x 35 pF 2 15 uV 5
3. S 167 MICROPHONE INTERCONNECT CABLES KC 1 AND KC 2 The microphone is connected to the power supply unit by means of a cable type KC 1 or KC 2 The cable KC 2 is fitted with a special six pole sorew on connector for the microphone with a universal joint connecting stud for screwing onto stands having V2 or 5 8 27 TPI threads The cable type KC 1 has no fixing stud and is used primararily as an extention cable or in conjunction with the elastic suspension type Z 38 SPECIAL ACCESSORIES Z 29 56 e High intensity overload protector MF 1 EA Table stand with V2 threaded stud T 60 K BLA Table tripod with universal joint M 31c a Floor tripod with flexible neck and microphone interconnect cable M 32 S Folding stand with V2 threaded stud Z 118 EE SE EE 000000090 Wind shield Z 38 os al Elastic suspension Z 56 a KM 56 test capacitance for cali brating purposes M 73k aaa ET Test apparatus for testing micro phone amplifier and power supply unit SG 5 crias Coupling for fixing cable type KC1 to stand Further details about special accessories and adaptors are to be found in our main catalogue MAINS UNIT NKM Aa Mains voltage ooooooooooo Fuses Valves 00 0 0 2 0 0 0 0 0 0 2 0 0 0 eee Power consumption DC outputs o Hum voltages Pilot Lamp 0 00 0 c Dimensions 0 000 0 0 0 00 cre o Weight 9 00 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 MICROPHONE
4. uV measured according to DIN 45 405 29 phon 190 pb 119 dB AB above 2 107 ub 2 dB 1 x AC 701k Telefunken length 150 mm Diameter 21 mm 125 g and 9 mV ub across 1000 a 9 mV pb across 1000 a 9 mV ub across 1000 a EE E r THAT E ii 44 E i cet 18
5. al By virtue of the small dimensions of the microphone capsule the directional properties are almost independent of fre quency and the rear jection ratio does not increase at the high frequency end relative to the middle and lower frequen cies This enables the microphone to be used close up as well as in the more reverberant sound field of a studio The high frequency lift which is otherwise needed to compen sate for the narrower pick up angle at the top end of the frequency range is therefore unnecessary with this micro phone Its response as measured in a linear sound field shows therefore only a small rise at the high frequency end This slight rise is favoured by most people since it enables a smooth response to be obtained in Close up as well as in standard recording technigues TECHNICAL DETAILS The microphone comprises a microphone capsule and a complete amplifier stage The output transformer is astatically wound and therefore insensitive to hum pick up The microphone capsule has two metal diaphragms which are mounted on either side of two fixed electrodes Each half of the capsule separately produces a cardioid response By putting an appropriate DC voltage onto the two electrodes the two cardioid responses can be combined in different ways in order to obtain the three different directional characte ristics i e omni directional cardioid and figure of eight The amplifier has a normal output impedance of 200 o
6. hms If desired it can be connected for 50 ohms resulting however in a 6 db reduction in output voltage Microphones connected for 50 ohms output have a red dot beside the number plate STANDARD ACCESSORIES Power Supply Unit NKMa The portable power supply unit NKMa provides the necessary supplies for the microphone from the mains The heater and plate voltages are stabilised The audio output socket is a three pole connector Tuchel T 3081 The appropriate line connector T 3080 will be supplied upon request The unit is fitted with a standard equipment type mains socket Power Supply Unit NN 4 8 b The power supply unit NN 48b can be used instead of the power supply unit NKMa the difference being that the unit NN 48b is also capable of feeding the larger microphones of the type M 49c and M 50c Battery Supply BB 12 and BB 50 When no mains are available the microphones may be fed from a battery supply type BB 12 or BB 50 These battery supplies have the same technical specifications as the por table power supply unit NKMa The unit type BB 50 is suit able for M 49c and M 50c while the unit type BB 12 is only suitable for miniature microphones PLUG IN POWER SUPPLY UNIT N52t The power supply unit N 52t has the same technical specifi cation as the unit NKMa but it is constructed as a plug in unit to fit into mixing consoles or racks Up to ten of these units may be rack mounted side by side in a plug in shelf type
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