Overview

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).

Product Details

  • 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
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)