Like the SF-12 the SF-24 is a stereo ribbon microphone. The difference between the SF-12 and the SF-24 is an internal amplifier that runs on phantom power. Because of this internal amplifier the SF-24 has a substantially higher output level which will mean your mic pre-amp will require less gain to get the signal from the microphone to an acceptable level. This jump in output level is an exceptionally good thing when you're recording quieter sources from a more distant position... say like the middle of a concert hall with an non-amplified sound source... like a choir or a chamber ensemble. The internal amplifier helps the microphone be less susceptible to the loading issues created by the inputs on various mic-pre amplifiers, as well as assisting the SF-24 to have exceptionally low "self noise" for a ribbon microphone.
Royer sf-24 features
Matched Pair In One
Like an SF-12, the SF-24 is actually two matched ribbon microphones placed one above the other, each aimed 45 degrees from center in the classic Blumlein configuration. The magnet/polepiece structure of each ribbon transducer allows a wide, uniform frequency range with no substantial peaks or dips, and the two 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).
More to Gain...
Royer's Active Series ribbon mics (SF-24 and R-122) are as sensitive as phantom powered condenser microphones, allowing you to use almost any mic preamplifier or board pre. Conventional ribbon microphones average 15 to 20 dB lower sensitivity than condenser mics, necessitating the use of high-quality, high-gain microphone preamplifiers for recording softer sound sources like acoustic instruments, vocals and room ambiance. The SF-24 contains two fully balanced, discrete head amplifier systems utilizing ultra-low noise FET's, each delivering a sensitivity of -38 dB. This lets you mate an SF-24 to any preamplifier with average gain characteristics. Even with quiet sound sources, you'll have enough gain to drive any recording medium.
Impedance Matching
The electronics in the SF-24 provide a perfect load to the ribbon elements at all times, allowing the microphone to deliver 100% of its full sonic potential regardless of the input characteristics of the following mic-pre. Due to its low-impedance output, SF-24's can also be used on extremely long cable runs with minimal signal loss.
A good impedance match is critical to ribbon microphones. Impedance mis-matching loads a ribbon improperly, resulting in loss of low end, diminished body, lowered sensitivity and an overall compromised performance. With our Active Series ribbon mics, the ribbon element lives in a perfect world. It sees an optimum impedance match at all times regardless of the following equipment, so its performance will never be compromised by the effects of improper loading. In addition, the ribbon element cannot be damaged by phantom power, electrical glitches or mis-wired cables.
The SF-24 has all of the outstanding stereophonic capability and sonic performance of our award winning SF-12 stereo ribbon microphone, with the addition of condenser-level gain and impedance matching circuitry that makes preamplifier mis-matching and gain-related noise a thing of the past.
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