Royer Labs SF-2


Royer SF-2: Unleashing Sonic Excellence

The SF-2, a phantom-powered rendition of the original SF-1 ribbon microphone, stands as a testament to Royer’s commitment to superior audio performance. Crafted primarily for classical applications and acoustic instruments, the SF-2 integrates high-quality audio capabilities with exclusive active electronics tailored for ribbon microphones.

SF-2 in Action

Twenty SF-2 prototypes underwent extensive testing in major studios and scoring stages before their official release. The microphone garnered acclaim in classical circles, excelling in capturing the nuances of choir, piano, woodwinds, strings, and a myriad of acoustic instruments. Its versatility also made it well-received in studios focusing on singer/songwriters and diverse acoustic applications. The SF-2 stands as a testament to Royer’s dedication to delivering top-tier audio solutions.

Key Features

  • Phantom-Powered Brilliance: Utilizes phantom power to deliver impressive sensitivity of -38 dB, compatible with a diverse range of mic preamps.
  • Ultra-Quiet Operation: Features custom-designed FETs and unique electronics for ultra-quiet operation with self-noise lower than 18 dB.
  • Magnet/Pole Piece Transducer: Employs a structure that produces a wide, uniform frequency response with minimal peaks or dips.
  • Uniform Frequency Response: Maintains excellent frequency response regardless of the sound angle striking the ribbon.
  • Gain Sensitivity: Matches the sensitivity of phantom-powered condenser mics, eliminating the need for high-gain preamps.
  • Free Gain: Higher output derived from a large, specially wound toroidal transformer, adding 14 dB of ‘free gain’ without noise.
  • Impedance Matching: Maintains a perfect load on the ribbon element at all times, ensuring consistent performance.
  • Phantom Power Protection: Protects the ribbon element from phantom power, electrical glitches, and mis-wired cables.


  • Choir, Woodwinds, Strings, Brass, and more
  • Piano, Harp, Orchestra, Acoustic Guitar
  • Percussion Instruments, Vocals, Drum Overheads
  • Ambiance capturing
  • Acoustic Operating Principle: Electrodynamic pressure gradient with active electronics.
  • Polar Pattern: Figure-8.
  • Generating Element: 1.8-micron aluminum ribbon.
  • Frequency Range: 30 HZ – 15,000 HZ +/-2db.
  • Sensitivity: -38 dBv Ref 1 Volt per Pascal.
  • Output Impedance: 200 Ohms @ 1khz.
  • Rated Load Impedance: > 1500 Ohms.
  • Maximum SPL: > 130 dB SPL.
  • Output Connector: Male XLR 3 pin (Pin 2 Hot).
  • Power Requirements: 48-Volt Phantom.
  • Supply Current: 4 mA.
  • Dimensions: 142 mm x 39mm (base) x 25mm (top).
  • Weight: 448 grams (15.8 oz.).
  • Finish: Matte black.