Mic Archive
Earthworks SR25
Photo: Earthworks, from its manual (Recording Hacks copy), p. 1.

Earthworks Audio

Earthworks SR25

Small-diaphragm cardioid condenser (prepolarised), transformerless; for drum overheads, percussion and guitar amps

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

Type
Condenser (electret)
Pattern
Cardioid
Sensitivity
−40 dBV/Pa
Self-noise
20 dB(A)
Max SPL
145 dB SPL
Impedance
65 Ω
Rated range
20 – 25k Hz

Frequency response

Angle
Distance

Frequency response: from the manual (Recording Hacks copy), p. 2. Fig. 2 "Frequency Response (Typical) of SR25" in the 2010 owner's manual; relative dB, 3 dB per division. Room and smoothing not stated. Dashed line, labelled "1m (3.3')".

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

Polar pattern

Polar pattern: from the spec sheet, p. 2. Polar graph on page 2 of the 2020 data sheet (the 2022 user guide: "Polar Response of SR25 (typical)"); full circle, rings every 6 dB (outer ring 0 dB, centre -36 dB). Measuring conditions not stated. Approximate reading error up to about 1 dB.

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All specs

From the spec sheet
Sensitivity−40 dBV/Pa (10 mV/Pa). "10mV/Pa (-40dBV/Pa)"; the same in all four documents.p. 2
Self-noise20 dB(A); also 22 dB(A), 2010 manual. "20dB (A weighted)"; the product page "20dB SPL equivalent (A weighted)". The 2010 manual: "22dBA equivalent".
Max SPL145 dB SPL. "Max Acoustic Input 145dB SPL".
Output impedance65 ohm, balanced, between pins 2 and 3; also 100 ohm, 2010 manual: balanced, 50 ohm each pin. "65Ω bal. (between pins 2 & 3 )"; the product page agrees.
Rated load impedance600 ohm, minimum, between pins 2 and 3
Poweringphantom 24-48 V. "24-48V Phantom, 10mA". The 2010 manual: 48 V phantom.
Current draw10 mA
ConnectorXLR-3 male (pin 2 hot). "XLR-3 (pin 2+)".
Dimensions165 × 22 mm. Length x diameter: "6.5 x .86 in. (165 x 22mm)".
Off-axis responseUniform frequency response at 0°, 45° and 90° off-axis
From the product page
Rated frequency range20 Hz to 25 kHz, ±2 dB at 30 cm; also [20, 20000], ±2 dB at 30 cm, 2022 user guide; also [50, 25000], ±2 dB at 15 cm, 2010 manual. "20Hz -25kHz ±2dB at 12 inches (30cm)". The data sheet prints "20Hz to 25kHz +2dB @ 30cm".p. 1
Weight160 g. ".35 lb. (160g)"; the user guide and the 2010 manual agree. The data sheet misprints "0.35 lb. (1.60kg)".
From the user guide
Supplied accessoriesmicrophone clip; microphone bag; foam windscreen; tip protector. "Your purchase includes": SR25, microphone clip, microphone bag, foam windscreen, tip protector.p. 2
HandlingThe small tip that lets the mic capture the highest frequencies is delicate; a tip protector is includedp. 3
From the manual (Recording Hacks copy)
Applications (Earthworks)Drum overheads and electric guitar amps (2020); in 2010 drums and percussion, the mic of the Earthworks DrumKit System, Leslie, guitar and bass, and kick drum with the KickPadp. 2
PatentUS Patent No. 6,091,829

Documents

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

Product page on earthworksaudio.comRecording Hacks

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