Royer Labs SF-24

SF-24 Stereo Active Ribbon Microphone

The SF-24 stereo ribbon microphone is a phantom powered version of our popular SF-12 stereo ribbon microphone. It combines the SF-12’s high quality audio performance, outstanding stereo separation and imaging with our exclusive active electronics system for ribbon microphones. The SF-24’s output of -38 dB is a full 14 dB more sensitive than our non-powered SF-12, putting its sensitivity on par with that of phantom powered condenser microphones. The unique electronics and custom designed FET’s used in the SF-24 allow for ultra-quiet operation, with self-noise of lower than 18 dB.

Like an SF-12, the SF-24 is actually two matched ribbon microphones placed one above the other in a coincident pair, each aimed 45 degrees from center in the classic Blumlein configuration. The magnet/pole piece structure of each ribbon transducer delivers a wide, uniform frequency response with no substantial peaks or dips, and the 1.8-micron ribbons produce superb transient response. 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 a Y adapter that splits into separate 3-pin male XLR connectors labeled “Upper” and “Lower” for the upper and lower capsules of the microphone (when held vertically).

Features

• Phantom powered circuitry provides high output and impedance matching
• True stereophonic (Blumlein and M-S) recording from one microphone
• High SPL capabilities
• No distortion up to maximum SPL rating<
• Extremely low residual noise
• Ribbon elements are not affected by heat or humidity
• Absence of high frequency phase distortion
• Equal sensitivity from front or back of elements
• Consistent frequency response regardless of distance
• High efficiency, matching toroidal transformers
• Very low magnetic leakage

Applications

• Drum Overheads
• Percussion Instruments
• Brass and Woodwinds
• Acoustic Piano
• Harp
• Choirs
• Solo Strings
• String Sections
• Orchestra
• Acoustic & Electric Guitars
• Vocal Groups
• Ambiance
• Stereo to Mono

Technical Data

• Acoustic Operating Principle: Electrodynamic pressure gradient with active electronics
• Polar Pattern: Crossed figure-8’s
• Generating Element: 1.8-micron aluminum ribbon
• Frequency Response: 40-15,000 Hz +/- 2dB
• Sensitivity: -38 dB (re. 1v/pa +/-1dB)
• Self-Noise: < 18 dB
• Output Impedance: 200 Ohms
• Rated Load Impedance: 1K-Ohm
• Maximum SPL: >130dB
• Output Connector: Male XLR 5 pin (stereo*)
• Power Requirements: 48-Volt Phantom Only
• Supply Current: 4 mA per channel
• Dimensions: 270mm X 39mm (base) X 25mm (top) (10 5/8″ X 1.5″ X 1″)
  Weight: 583 grams (20.5 oz)
• Finish: Optical Black, 18K Gold (optional)