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Neumann M149 er en rørmikrofon med hele 9 ulike karakteristikker i et klassisk Neumann-design. Mikrofonens doble kapsel bærer arven fra U47 og M49 videre.
Selve hjertet i M149 er en ny-designet K49 kapsel, hvor påfølgende rørkrets også fungerer som en effektiv impedansekonverterer. Paret med den transformatorfrie utgangskretsen gir den mikrofonen et ekstremt støysvakt design. I 1997 fikk den prestisjetunge TEC award, nettopp for dette innovative prinsippet.
Nøkkelfunksjoner
- Universal rør-mikrofon med 9 karakteristikker
- Trykkfølsomt element med stormembran K49-kapsel, nedarvet fra U 47 og M 49
- Transformatorfritt krets-design
- Lav egenstøy
- 7 stegs hi-pass filter (fra 20 Hz til 160 Hz)
- Leveres med EA170 elastisk oppheng, power supply, og kabel i en lekker aluminiumskoffert
Applications
There are nine polar patterns to choose from, making this microphone an ideal choice for a wide range of recording situations.As its ancestors, the M 149 Tube is a superb vocalist microphone, not only because of the capsule, but also due to its modern circuitry, characterized by extremely low noise level.
Acoustic features
The capsule is mounted elastically inside the headgrille to eliminate structure borne noise. The surface below the capsule is shaped like a cone to disperse any reflected sound from the acoustic upper half space. This avoids any interference with the primary sound arriving at the capsule directly.
A large headgrille surrounds the capsule. It is acoustically very open and therefore increases the sonic realism.
Polar patterns
Electrical features
The aim was to provide a more controlled environment for the audio signal on its path from the capsule to the output section.
The final stage is an integrated amplifier, especially designed for such applications. It features very low distortion (THD < 0.002 % at ± 10 V), very low self-noise, and high output current capability.
As a result, the tube circuit is completely decoupled from the microphone output and its characteristic response curve will be unaffected by very high signal levels or varying load conditions.
The lower output impedance and higher output current capability allow cable lengths up to 300 m (1000 feet) without any degradation of the audio signal.
The tube amplifier changes the high impedance of the capsule and adds 10 dB of gain to the audio signal, providing optimum operating specifications. The wide dynamic range is impressive, as peak output can be ±10 V, at 20 mA.
The ideal operating point of the tube is maintained throughout its entire life expectancy. Plate current and filament voltage are constantly regulated. A sensor circuit monitors and compensates for any voltage drop across the microphone cable. The tube is heated up slowly through inverse current limiting to guarantee long life. Optimum operating conditions are reached within a very short time.
Filter
In addition, the filter provides an effective tool to control the audio signal when the microphone is used at close distance and therefore proximity effect alters the program material.
Delivery Range
The microphone comes as a set in an attractive aluminium case, together with the 8-core microphone connecting cable, the N 149 A power supply with plug-in mains unit, the EA 170 full elastic microphone suspension and a dust cover.
| Acoustical operating principle | Pressure gradient transducer |
| Directional pattern | Omnidirectional, wide angle cardioid, cardioid, hypercardioid, figure-8 plus one intermediate position each |
| Frequency range | 20 Hz ... 20 kHz |
| Sensitivity at 1 kHz into 1 kohm | 34/47/62 mV/Pa1) |
| Rated impedance | 50 ohms |
| Rated load impedance | 1 kohms |
| Equivalent noise level, CCIR2) | 28/25/23 dB1) |
| Equivalent noise level, A-weighted2) | 16/13/11 dB-A1) |
| Signal-to-noise ratio, CCIR2) (rel. 94 dB SPL) | 66/69/71 dB1) |
| Signal-to-noise ratio, A-weighted2) (rel. 94 dB SPL) | 78/81/83 dB1) |
| Typical SPL (tube characteristic)3) | K < 0,5 %: 120 dB, K < 5 %: 136 dB |
| Maximum output voltage | 18 dBu |
| Dynamic range of the microphone amplifier (A-weighted) for < 0,5% THD (for < 5% THD) | 101 (121) dB |
| Powering | Power supply N 149 A |
| Matching connectors | Microphone DIN8F, Power supply XLR3F |
| Weight | 730 g |
| Diameter | 70 mm |
| Length | 201 mm |
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1) Omnidirectional / cardioid / figure-8
2) according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
3) measured as equivalent el. input signal
