Sennheiser MKH 106 P 48 User Manual Page 27
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Microphones
Publ. 06/02
Operating principle of the Back-Electret Pre-Polarised Condenser
Microphone
Condenser microphones use a variable plate capacitor as an acoustic transducer,
the front electrode being the microphone’s diaphragm. As it moves the capacitance
changes and a voltage proportionate to the acoustic signal is produced.
The electrodes used in electret (pre-polarised) condensers are manufactured from a
special synthetic material known as the ‘electret’. This material has a unique quality,
being able to permanently store an electric charge; the charge is thus ‘frozen’ in the
electret material. It therefore requires no high external polarising voltage and can be
powered by low voltage internal batteries.
In the Sennheiser range of back-electret condenser microphones, only the stationary
back electrode (‘back plate’) is used as the charge carrier. The counter electrode,
manufactured from a gossamer-thin foil (3.5 µm), is made conductive by applying a
thin layer of gold in a vapour-coating process. This ultra-light diaphragm (approx.
100 µg) has a good transient response, high sensitivity at low sound pressure
levels and ensures highly accurate sound reproduction with minimal distortion.
In contrast to dynamic microphones, back-electret condenser microphones can be
very compact. This makes it possible to design ultra-small clip-on lavalier micro-
phones, and to use capsules for shotgun microphones of variable directivity factors.
Powering
The impedance converters and low-noise amplifier circuits used in Sennheiser’s
back-electret condenser microphones are powered by an integral battery, a Sennheiser
radio transmitter, a power supply adaptor, phantom powering (XLR-3), or external
power supply. The following descriptions refer to available product variants.
Description of Models
MKE ... Back-electret condenser microphones can be identified by the inclusion of
the letters MKE in their model number.
...-C Variants delivered without accessories and carrying case or protective
pouch.
...-2R Variants in the -2R range are powered via the SK 2012 pocket radio
transmitter.
...-4 Variants in the -4 range are powered via the SK 50, SK 250, SK 5012 or
SK 3063 pocket radio transmitters.
...-5 Variants in the -5 range normally have open-ended cables.
...-60 Variants in the -60 range and the ME 62...67 range of microphone heads
are powered via the K6 or K6P powering modules.
...-P Variants in the -P range are fitted with a 3-pin XLR connector, which can
be connected directly to phantom powering (DIN IEC 268-15) 12 to 48 V.
COM These microphones are designed for use in conference and communi-
cations situations.
. . . evolution microphones are designed specifically for live stage applications.
Back-Electret Condenser Microphones
- Microphones 1
- Published 06/02 1
- Subject to alterations 2
- Contents 3
- Dynamic Microphones 5
- Cat. No. 03213 8
- Cat. No. 03214 9
- Cat. No. 00292 10
- Dynamic Microphone 10
- Cat. No. 05173 11
- MD 421 II 13
- Cat. No. 04306 14
- MD 428 PTT 15
- MD 431 II 16
- MD 441 U 17
- Cat. No. 04512 18
- Cat. No. 04521 19
- Cat. No. 04519 20
- Cat. No. 04520 21
- Cat. No. 04522 22
- Cat. No. 04511 23
- Cat. No. 04514 e 835 S 24
- Cat. No. 04513 e 835 24
- Cat. No. 04516 e 845 S 25
- Cat. No. 04515 e 845 25
- Cat. No. 04517 26
- Overview 29
- Cat. No. 05185 30
- Cat. No. 04847 e 865 S 31
- Cat. No. 04846 e 865 31
- Cat. No. 03171 32
- MKE 44 P 33
- MKE 2 P-C 34
- MKE 2-4 Gold-C 35
- MKE platinum-4-C 36
- ME 102/104/105 System 37
- Powering Module 40
- Cat. No. 03279 40
- Cat. No. 03280 41
- K6/K6P Modular System 42
- Back-Electret Microphone Head 43
- Cat. No. 03281 43
- Cat. No. 03282 44
- Cat. No. 03283 45
- Cat. No. 03284 46
- Cat. No. 03285 47
- COM 1423 48
- RF Condenser Microphones 49
- Cat. No. 02857 52
- Cat. No. 02872 53
- Cat. No. 02645 54
- Cat. No. 03109 55
- Cat. No. 03148 56
- Cat. No. 03149 57
- Cat. No. 03004 58
- MKH 800 P 48 60
- MKH 416 P 48 U 3 62
- Cat. No. 02960 65
- Cat. No. 02959 65
- Microphone Clamps 66
- Cat. No. 03287 68
- Cat. No. 03017 68
- Cat. No. 03685 68
- Cat. No. 01956 68
- Cat. No. 05299 69
- Cat. No. 00972 69
- Cat. No. 04711 69
- Cat. No. 01955 69
- Table Stands 70
- Foam Windshields 72
- Cat. No. 03606 77
- Cat. No. 03610 77
- Cat. No. 03609 77
- Cat. No. 03607 78
- Cat. No. 03224 78
- Outdoor Protection for MKH 70 79
- Publ. 06/02 80
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