The Royer SF-24 active stereo coincident ribbon microphone is the only microphone of its kind available, combining high quality audio performance with outstanding stereo separation
and imaging. It is a modern ribbon design with no audible diffraction effects or cavity resonance. The SF-24’s active electronics produce an output comparable to studio condenser microphones and provide an optimum impedance to the ribbon elements, preventing overdamping of the elements and assuring consistent microphone performance.
The high gain and low output impedance of the SF-24 allow it to operate with any microphone preamplifier with phantom power, including those of nominal gain and input impedance characteristics.
The SF-24 is actually two matched ribbon microphones placed one above the other and fixed at a 90° angle. This arrangement allows for Blumlein and M-S recording with one microphone, as well as excellent monaural compatibility when summing the two elements to mono. The frequency response is excellent regardless of the angle of sound striking the ribbons, and off-axis coloration is negligible. The SF-24’s extension cable comes with an adapter which splits into two separate left and right XLR connectors, labeled “upper” and “lower.”
The SF-24’s two 1.8-micron ribbons are of pure (99.99%) aluminum and provide superb transient response due to their low mass. The SF-24’s transducers incorporate “cross-field” motor assemblies (patent pending) which are comprised of four powerful Neodymium magnets and Permendur iron pole-pieces. This cross-field design delivers excellent high frequency response due to the extremely short path between the front and rear sides of the ribbon elements. The microphone’s case is ingot iron and forms part of the magnetic return circuit, an effective system with low leakage flux which contributes to the mic’s high sensitivity.
SF-24 FEATURES
True stereophonic (Blumlein and M-S) recording from one microphone
Operates on standard 48-volt phantom power
Active electronics provide high output capability
Absence of high frequency peaks, “ringing” and phase shifts
Extremely low self noise
Ribbon elements unaffected by impedance/load, heat or humidity
Equal sensitivity from front and back of elements
Very low magnetic leakage
RECOMMENDED APPLICATIONS
Stereo & distance miking
Choir, orchestra, string sections
Overhead drums & percussion instruments
Room miking, distance & ambience miking
Brass instruments, horn sections
Woodwinds, flute & other reed instruments
Stereo acoustic piano, harp
Acoustic guitar, mandolin, stringed instruments
Technical Specifications
Acoustic Operating Principle: Electrodynamic pressure gradient with active electronics.
Polar Pattern: Symmetrical figure-8
Generating Element: 1.8-micron aluminum ribbon
Magnets: Rare Earth Neodymium
Frequency Response: 40-15000 HZ ±2dB
Sensitivity: -40dB (re. 1v/pa ±1dB)
Self-Noise: < 18 dB
Output Impedance: 200 Ohms
Output Connector: Male XLR 5-Pin (Stereo)
Rated Load Impedance: 1K-Ohm
Maximum SPL: 130dB
Power Requirements: 48-Volt Phantom Only
Supply Current: 4 mA per channel
Dimensions: 10 5/8” X 1.5” wide (base) X 1” wide (top) (270mm X 39mm X 25mm)
Weight: 20.5 OZ (583 grams)
Finish: Optical Black, 18K Gold (optional)
Accessories: 25’ Cable (XLR5 to 2 standard 3-pin XLR male), shock mount, protective case, mic sock
Optional Accessories: Wind screen, 50 or 100 foot extension cables