Royer SF-2 Active Ribbon MicrophoneThe SF 2 ribbon microphone is a phantom powered version of the original SF 1 ribbon microphone. Designed primarily for classical applications and acoustic instruments, the SF 2 combines high quality audio performance with our exclusive active electronics for ribbon microphones. The SF 2's output of 38 dB puts its sensitivity on par with that of phantom powered condenser microphones, allowing it to be used with a wide variety of mic pre's regardless of