Neumann SM-69 Stereo
Stereo Condenser Microphone
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USM 69 i Stereo Condenser Microphone
The USM 69 i stereo condenser microphone is a fet 80 series studio microphone for high quality stereo recordings featuring built-in directional pattern selectors. Its acoustical characteristics are identical to those of the well-known SM 69 fet ste- reo condenser microphone since the entire cap- sule configuration has been adopted from it un- changed.
As in the SM 69 fet, the microphone head of the USM 69 i houses two completely separate con- denser elements with gold-coated polyester film membranes, mounted one above the other and each associated with two completely separate mi- crophone preamps. The upper capsule may be ro- tated against the lower one through an arc of 270 degrees. This makes intensity stereo record- ing (MS or XY) possible. With this technique sounds impinging from different directions pro- duce only intensity differences, yet no delay (phase) differences between the two systems. As a result, both signals may be combined to obtain good mono reproduction without phase cancella- tion interference. Color marks on the lower cap- sule grille indicate the angle between the axes of maximum sensitivity of the upper and the lower capsule (pick-up angles).
In addition, the USM 69 i may be used to drive mono channels where two independent micro- phones or a back-up system are needed at the same location.
Both microphone systems are electrically inde- pendent of one another. The other microphone preamp will not be affected, even with an earth (ground) fault of the supply voltage in one chan- nel or shorting of one output.
The preamplifiers of the USM 69 i are designed as operational amplifiers offering additional head- room and particularly low equivalent noise. The USM 69 i therefore picks up both distant sound sources as well as extremely loud sound sources at close proximity without difficulty.
Both preamps are equipped with an active filter blocking subaudio sound (as may be caused by mechanical shock or wind) ahead of the output transformers preventing the latter from being overloaded.
Several design features render this microphone largely immune not only to parasitic alternating currents in the cable shield, so-called ac-induced hum, but also to interference caused by radio and TV transmitters as well as radar equipment.
- Acoustical op. principle: Pressure gradient transducer
- Directional pattern: Omni, wide-angle cardioid, cardioid, hyper cardioid
- Frequency range: 20 Hz - 20 kHz
- Sensitivity: 13 mV/Pa
- Rated impedance: 150 ohms
- Rated load impedance: 1000 ohms
- S/N ratio CCIR 468-3: 70 dB
- S/N ratio DIN/IEC 651: 81 dB
- Equivalent SPL CCIR 468-3: 24 dB
- Equivalent SPL IEC/DIN 651: 13 dB-A
- Max. SPL for 0.5 % THD2) at 1 kHz: 132 dB
- Max. output voltage: 3 dBu
- Supply voltage: 48 V ± 4 V
- Current consumption: 2 x 0.7 mA
- Matching connector: XLR 5 F
- Weight: 510 g
- Diameter: 30 + 48 mm
- Length: 293 mm
1Pa = 10μbar 0 dB 20 μPa