The SF-1 is an ultra-compact, monaural ribbon microphone, exhibiting flat frequency response and a well-balanced, panoramic soundfield. The SF-1 has superb transient response due to its ultra low-mass 1.8-micron ribbon assembly. Frequency response is excellent regardless of the angle of sound striking the ribbon, and off-axis coloration is negligible. The heart of the SF-1 is its proprietary cross-field ribbon transducer. Comprised of four powerful Neodymium magnets and Permendur iron pole-pieces, the cross-field design assures the shortest front-to-rear ribbon path length for best high frequency response. The case is fashioned from ingot iron and forms the magnetic return circuit, an effective system with low leakage flux which accounts for the relatively high sensitivity in a trim package.
"no real figure-of-eight mic will have such accurate polar patterns over almost the entire frequency range" Don't underestimate the imaging of an imperfect figure-8 such as an Sf-1 or Schoeps 8. Personally, I would choose these over the Soundfield offerings (which are also valid and good sounding).
...as consisting of two fig 8 mics close spaced, pointing straight ahead (not angled outward). I like using it with two SF-1 mics, and consider it a favorite array for creating a narrow stereo image. It works well in an overly reverberant space with good acoustics, isolating the ensemble from the hall, reducing ambient noise, taming the reverb...
Two great ones are Royer sf-1 (veiled, refined, low mids emphasis), and sE vr-1 (pleasant, smooth, flat frequency response). Both are fairly small and light for ribbon mics, which helps in mic placement options.
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