Mic Archive
Royer SF-24
Photo: Royer Labs, from its spec sheet, p. 1.

Royer Labs

Royer SF-24

Active stereo coincident ribbon mic: two figure-8 ribbons at 90° (Blumlein, M-S) in one body, phantom powered

Approximate Some readings for this mic are uncertain; see the graphs.

Type
Ribbon
Pattern
Figure-8
Sensitivity
−38 dBV/Pa
Max SPL
130 dB SPL
Impedance
200 Ω
Rated range
40 – 15k Hz

Frequency response

Angle
Distance

Frequency response: from the spec sheet, p. 2. Titled "Frequency Response and Polar Pattern"; distance and room not stated. Approximate reading error up to about 1 dB.

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

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All specs

From the spec sheet
Capsuletwo 1.8 micron aluminium ribbons, crossed at 90°, one above the otherp. 2
Sensitivity−38 dBV/Pa, per element, ±1 dB. "-38 dB (re. 1v/pa ±1dB)"; the manual says ">-38 dBv".
Max SPL130 dB SPL, at 50 Hz. Manual p. 8: "the SF-24's ribbons would stretch well before its electronics would overload".
Output impedance200 ohm. The manual (p. 17) says "300 Ohms @ 1 kHz".
Rated load impedance1000 ohm, minimum. "1K-Ohm minimum"; the manual (p. 17) says "> 1500 Ohms".
Rated frequency range40 Hz to 15 kHz, ±2 dB. The manual (p. 17) says "30 Hz – 15,000 Hz ± 3 dB".
Poweringphantom 48 V only, on each channel
Current draw4 mA, per channel
ConnectorXLR-5 male (stereo)
Weight583 g. The manual (p. 17) says 531 g.
Dimensions39 × 270 mm. "270mm X 39mm (base) X 25mm (top)": length 270 mm, 39 mm wide at the base, 25 mm at the top.
Finishoptical black (black chrome over nickel); 18K gold optional. Black chrome over nickel: manual p. 16.
Supplied accessories25 ft XLR-5 to 2 × XLR-3 male cable; shock mount; protective case; mic sock. Optional: windscreen, 50 or 100 ft extension cables. The manual names the shock mount RSM-24.
Self-noiseless than 18 dB
MagnetsRare-earth neodymium
BodyIngot iron (low carbon steel) case, part of the magnetic return pathp. 1
WarrantyLifetime to the original owner; first re-ribbon free within the first yearp. 2
Applications (Royer)Stereo and distance miking; choir, orchestra, strings; drum overheads and percussion; room and ambience; brass; woodwinds; stereo piano, harp; acoustic guitar, mandolinp. 1
From the manual
ElectronicsToroidal transformers and electronic buffer stages; output 15-25 dB higher than a passive ribbon mic; the ribbons see a constant load whatever the preampp. 3

Documents

Copies kept by Mic Archive, because manufacturers move and drop their documents. Each is © Royer Labs, unchanged, with its original address.

Product page on royerlabs.comRecording Hacks

Recommended for

Instruments whose sources name this mic, or an earlier version or variant of it.

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