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BidirectionalBlumleinRoyer Labs SF-24

Multi-Pattern Active Ribbon Stereo Microphone

The SF-24 is a phantom-powered version of the SF-12. Both are dual-ribbon stereo microphones with an onboard XLR5 connector, which is split via included jumper cable into two standard XLRM connectors.

Unlike dynamic ribbon designs, the SF-24 is not sensitive to input loading or impediance from the preamp. Onboard active electronics provide an ideal, constant load on the element, providing a much more sensitive response. This translates to much higher output as compared to a dynamic ribbon mic, allowing the use of any standard preamp, without concern about “impedance matching” controls.

Like the R-122, the so-called “amplifier circuit” in the SF-24 actually reduces the gain coming from the step-up transformers attached to the two ribbon transducers. The active circuitry performs impedance conversion only, and its output is transformerless.

The resulting self-noise is 18dBA.

SF-24The SF-24 ships with an elastic shockmount, a padded storage case for the mic, and a padded flightcase to store the mic, shockmount, and XLR5F-to-dual-XLR3M breakout cable.

The Royer Labs SF-24 is also known as: SF24.


Frequency Response - BlumleinClick Graph to Compare!
SF-24 Blumlein Frequency Response Chart
Pickup Patterns Pads & Filters
Bidirectional (12.5 mV/Pa; 40 - 15,000 Hz)
Blumlein (12.5 mV/Pa; 40 - 15,000 Hz)
Ribbon Construction Impedance SPL/Noise
Length: 31.7mm
Width: 1.58mm
Gauge: 1.8 microns
200 Ohms (Low) Max SPL: 130 dB
Self-noise: 18.0 dB(A)
Weight Length Max Diameter Interface(s)
583g (20.56oz) 270mm (10.63'') 39mm (1.54'')
  • 5-pin XLR male (2)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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