Royer Labs SF-2 - Manual (Page 16)

Over time, some of this oil will be drawn out due to "wicking" action, the physical handling of
the microphone or absorbent materials it is exposed to (like the foam padding of the microphone
case). As the oils are drawn out of the microscopic surface layer, the microphone finish may
develop an uneven appearance. If this happens, simply massage the microphone gently with a
lint free cloth treated with a few drops of light machine oil or WD-40® (apply the oil to the
cloth, not to the microphone). Be very careful whenever working around the transducers to avoid
contamination of the ribbon elements. Following this simple procedure will protect the finish and
renew it to its original luster.
Features and Specifications
SF-2 Features:
• Smooth, wide frequency response
• Active electronics offer greatly enhanced output and deliver a constant, optimized impedance
to the ribbon element
• Extremely low residual noise
• Ribbon element is unaffected by heat or humidity
• Absence of high-frequency phase distortion
• Excellent phase linearity, even off-axis
• Equal sensitivity from front or back of microphone
• Consistent frequency response regardless of distance
• Compact size
SF-2 Specifications:
Acoustic Operating Principle: Electro-dynamic pressure gradient
Generating Element: 1.8 micron aluminum ribbon
Polar Pattern: Figure-8
Frequency Range: 30 HZ – 15,000 HZ +/- 2db
Sensitivity: -38 dBv (Ref 1 Volt per Pascal)
Output Impedance: 300 Ohms @ 1kKz
Rated Load Impedance: > 1500 Ohms
Maximum SPL: > 130 dB SPL
Output Connector: Male XLR 3 pin (Pin 2 Hot)
Power Requirements: 48-Volt Phantom
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