Neumann.Berlin Sm 23c User's Manual
Contents
1. GON d CL OUT OI OC OT HEU OUT RINNAN a ee poe Aha I ue HAN b p nu y dos uc HH uu 1 uu A a E o Im L i iit D III EHEN In ii ii iM lun Dt Ih ii Hi TM BEN DAA UR il E EL Hue UTERE H SUELE ebe EE IEN WEEK Aa EHFHHEHEH EIER x iui HIE HIHHLLLEEHEH LEE LECHE EE ELLE LEE LG ELEC LLLCLEUELEELL LETT ELELLT i p OUTLOOK IO ITU OUR SARA ME AH MAM MEN A NA TTT CTT DO CTT OUREERRRAUREDURRNEA RESIUEROOSZOQUSGGRO0RR00E000 RURRRUNEAERRERRANERN SE SUN H ek Ee uuu ule pup Pu pup SI SE AL e Bene i s a HE iii IE S PLE 2 0 Sa mon mpi ou LEE An AA BUUUENORUEHNUNTERRRURURUREREN SORREERUSLENBRNORBUNGERRRURUNTRERNGERUNUE RUNUUBURRLANNLUNRURELRESE D db Akt Anel He JURENSEELEBBEERERERERRANNEREN IUUEBENRUNDGORNENEBTRGERDEREBREHANNERREREL VUERERDENDUBUURERGBERRRRUNNNSEREIHUERUNGURERRRENENE VERNNERRRBEERUNARRERURESE Mm IR uM TREE Ano cn ELLE LT ROLL FU in Au DEDE HIE He ARER Al N a Ul x ui DS i HEHE VE m UU Neq d M ae e rer PRAE o ugs eis qu in tue BIH iE TH il IR ii A A ul M REE2. miniature condenser microphone by mak ing suitable connections to the input socket However it is not advisable to connect 2 microphones simultaneously since this results in a ground loop which might lead to hum pick up Power Supply Unit NN 48b Two supply units are needed to feed a double microphone type SM 25c from the mains The portable power supply units NN 48b are Suitable for this purpose These units also provide sta bilised heater and plate voltages the connections to the microphone are made via an 8 pole socket type B T 3053 The mains input socket is of the standard equipment type and the audio output connector is a 3 pin socket type M T 3081 The directional characteristics of the microphone are set up by means of a potentiometer This power supply unit is al so equipped for feeding a miniature condenser microphone Plug In Power Supply Unit N 52t The double microphone SM 23c can also be supplied from two power supply units type N 52t The specifications of this unit cor respond to those of the portable power supply unit NN 48 b The N 52t is a single plug in unit intended for fixed studio installations A plug in shelf type S 167 10 will house up to ten of these units side by side in a rack A knob on the front panel of this mains unit below the locking handle is for setting up the directional characteristics of the micro phone Battery Supply Unit BB 50 In the absence of mains the double microphone SM 23c may be
3. the number plate A calibrating voltage can be applied to the input of either of the ampiifiers in the SM 2c and SM 23c via the special test head Z 57 For MS recordings a matrixing converter SU 2t has to be used Special connection diagrams are supplied with it and should be observed carefully STANDARD ACCESSORIES Power Supply Unit NSMa The portable power supply unit NSMa is exclusively for the supply of one stereo microphone SM 2c from AC mains The hea ter and plate voltages of the power supply unit are stabilised and therefore independent of mains vol tage fluetuations The two NSMa 23 Switches on the front pa nel of the power supply unit are for switching the directio nal characteristics of the microphones The SM 2c is connect ed to the power supply unit via a twelve pole socket B T 3618 and the connection to the mains is made via a mains socket The audio output connector is a five pole socket M T 3085 For supplying one stereo microphone SM 23c from one power supply unit the NSMa 25 is available Plug In Power Supply Unit NSK The power supply unit NSK is also intended to supply a mi crophone type SM 2c and its circuit corresponds to that of the portable power supply unit NSMa It is constructed as a twin plug in unit for fixed studio installation Up to five of these units may be fitted side by side into one plug in shelf type 8 167 10 The power supply unit NSK can also be used for supplying a
4. STEREO CONDENSER MICROPHONE S M es DOUBLE CONDENSER MICROPHONE SM 2520 SM 2 SM 23 910 02 01 A CDI AUDIO The Stereo Condenser Microphones SM 2c and SM 23c are top flight studio micro phones They feature the outstanding qualities inherent in condenser micro phones and their great versatility en ables them to be used for solving the most complex recording problems Both microphones can be applied to a wide range of recording techniques Since they contain effectively two single microphones in one unit they may be used for various special appli cations They were developed to stereo phonic recordinss in particular for the intensity system but they can also be used advantageously when two microphones of different directional characteristics are required in the same position 7 je SAL Em tU e ETAT Ww e eee e 2l oe RS d E d UA NX 2 NW Gem 8 is AE y y ak S A EH qe p E So 5h NEZ se M ez ZS OW x Zu 2 ER AA net x gt T FEATURES The stereo microphones SM 2e and SM 23c comprise a microphone capsule assembly containing two capsules mounted close ly one above the other and an ampli SE BERGE NEWMAN NE UABORATOREUMREURE ELERTROMKUSTEKE GMBH BERLIN GT WEST 244 Printed in Germany fier section containing two microphone preamplifiers One power supply unit is needed with the SM 2c while the SM 23c is connected in such a way that it is supplied fro
5. crophone floor stand with Y2 and 3 8 screw studs Adapter double plug for the microphone SM 25c with one 12 pole connector type B T 5618 and two 8 pole connec tors type M T 5052 Adapter double plug for microphone type SM 23c with one 12 pole connector type B T 5618 and two 7 pole connectors type M T 3470 Adapter cable for power supply unit NSMa with one 5 pole connector type T 2084 and two 3 pole connectors type T 3079 Elastic suspension for microphones SM 2c and SM 23c Wind shield for SM ec and SM 23c Test capacitance op SM ec Test head for SM 2c and SM 23c Portable matrixing converter for SM ec and SM 23c TECHNICAL DATA Microphones SM 2c and SM 23c Acoustical system Two units each comprising two pressure gradient transducers electrically switchable for om ni directional cardioid or figure of eight Frequency range enee a e e HO ssi 1o QUO CHE Output Levels semis sis 1 mV ub across 1 000 o omni directional cardioid and figure of eight Channel separation 45 dB Electrical load resistance 1 000 250 a Electrical source ia quet a a ees 200 50 a 20 Capacitance of microphone capsule 4 x ca 35 pF Stray voltaee neess 15 uV Noice Voltage a D uV 28 phon measured according to DIN 45405 Maximum sound pressure for 5 harmonic distortion at 40 1000 an 5000 cps 245 ub 2 ca 121 dB dB above 2 x 10 ub Gain of micr
6. fed from two battery units type BB 50 This unit is fitted with a four element airtight DEAC steel accumulator and a transistor DC converter The mechanical construction and the technical specifications of this unit correspond to those of the portable power supply unit type NN 48b It is also fitted for feeding a miniature condenser microphone The directional characteristics of the microphone are controlled by means of a Switch Interconnection Cables SC 1 SC 2 and C 26 Adapter Double Flug Z 10 The stereo microphone SM 2c is connected to the power supply unit NSMa by means of an inter connection cable type SC 1 or SC 2 Both cables have a stan Pp dard length of 10 meters and are v fitted with the Plugs T 3615 and T 35616 The cable SC 2 is also fitted with amp universal coupling link for screwing onto stands with Ye and 5 8 27 TPI threads SC 2 und Z 10 For connecting the double micro phone SM 23c to its two power supply units an adapter double plug type Z 10 is needed This adapter has one 12 pole con nector type B T 3618 and two 8 pole connectors typeM T 5022 The microphone is connected to the adapter by means of a cable type SC 1 or SC 2 Two cables type C 26 link the adapter to the two power supply units This cable also has a standard length of 10 meters and is fitted with two 8 pole connectors type T 3050 and T 3051 SPECIAL ACCESSORIES M 31 LZ 10 A 11 Z 12 Z 42 Z 45 a oD Z2 27 SU 2t Mi
7. m two se parate power supply units This enables the SM 23c to be used as a double microphone with extremely hish reliability A further advantage of the SM 23c is that it can be supplied from the fixed power supply units type N 52t In appearance and in performance the two microphones SM 2c and SM 23c are identical TECHNICAL DETAILS Each capsule consists of two fixed electrodes firmly screwed together and suitably drilled and two friction damped dia phragms Each capsule therefore contains a system of two units each with cardioid response Omni directional Cardioid and Figure of eight response curves can be ob tained by switching the connections and by altering the po larity of the DC bias voltage The response curve of each individual system can be set from the power supply unit without affecting the other one The upper microphone system should be offset at an angle of 2709 to the lower one The direction of operation is radial to the microphone Each microphone capsule has its own amplifier The two am plifiers are mounted side by side in the housing They are effectively screened from one another The output transfor mers are astatically wound and therefore insensitive to hum fields The output impedance of the amplifier is normally 200 ohms but it can also be connected for 50 ohms In this case the output voltage of the microphone is reduced by 6 dB Microphones connected for 50 ohms are marked with a red dot beside
8. ophone TEE ee bs ce EES s dB VIIVE MET TET TITEL 2 x AC 701k Telefunken DIMENSIONS ear Length 210 mm diameter 30 mm WET DA p ee eras are a ee ee a 270 E Maine Voltage 147 127 220 240 Volts AC 10 Busse EEE E d 129 7 OO X mT according to DIN 4 57 Power consumption 11 Watts DO OUTPUT nd dua rie do vac EE 120 V 1 mA 4 V 200 mA O ues 7I V Bun YOolbD8EG 5e 39599 10 uV 8 uV resp Pilot Lamp iaa O Rafi 110 V No 2855 Dimens1ons22 2385 4ER 220 x 100 x 120 mm We TO Ga isis ds ad ie ees 2 0 kg Mains voltage ene 117 127 220 240 Volts AC 40 EVI EEE EEE 08 05 A mT according to DIN 41 971 Power consumpti0N o 41 Watts DG OULDUES e eens 490 V 6 5 mA 4 V 100 mA Or xa deo Y Hum VO CACC riadas 10 DV o UV resp Pilot Tampa san Rafi 110 V No 2855 DIMENSIONS EC e 220 x 100 x 100 mm METE Dra amp Bees TEE H EHH H dados niht Hh UNEEBSEERERENESENSREEENN HH PELLE HH HH SUREBESSERERFERES Er q a ll BLU yi i Top HOHER nmi nmm In yd iii L ABRBBBERREREET REREEPERNEESRESRSSRERRSSRSRFSRSRSRR Aid i HH HH FH HEBES acia m EIERE NALES LOL TC e es e eren i EE dee BEEN IREREREEERRERTEERRERTE ESSERE EE SEREREEREB EEEREREE BARRBUERERRERRERERRTAGEENEREER EHE DEE AAA ANNEBZUNNERANTGNNEERUUFBRRRTGEN A CHURKEAAEUAUGUSSUEESEE SUOUEHUERD EULELSESEUAEBACRY e imn ERR EH HH GIE GIA ee ddp tb V ARSEENIN HIER OT UO ac Aedo Gd MRHHHH Hiet WU ue n Mie HH EHE tocada UU UU
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