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Earthworks Audio

Earthworks QTC40

Small-diaphragm condenser, omni (pressure), measurement-style tapered body; 3 Hz to 40 kHz

Type
Condenser (electret)
Pattern
Omni
Sensitivity
−29 dBV/Pa
Self-noise
20 dB(A)
Max SPL
140 dB SPL
Impedance
65 Ω
Rated range
3 – 40k Hz

Frequency response

Angle
Distance

Frequency response: from the manual (Recording Hacks copy), p. 2. Fig. 2 "Frequency Response (Typical) of QTC40" in the 2005 owner's manual; relative dB, 3 dB per division. A smooth "typical" curve; distance and room not stated.

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

Polar pattern

Polar pattern: from the graph polar, p. 1. Image "QTC-Series-Polar-Pattern-2022" on the QTC40 product page (the file name says QTC series); each frequency drawn on one side only (1 and 5 kHz left, 10 and 20 kHz right), taken as symmetric. Measuring conditions not stated.

Compare with other mics

All specs

From the user guide
Self-noise20 dB(A); also 22 dB(A), 2005 manual. "20dB SPL (A weighted)". The 2005 manual: "22dBA equivalent".p. 4
Max SPL140 dB SPL, peak acoustic input; also 142 dB SPL, 2005 manual. "Peak Acoustic Input 140dB SPL"; no THD figure.
Output impedance65 ohm, balanced between pins 2 & 3; also 100 ohm, 2005 manual: 50 ohm each pin 2 & 3
Rated load impedance600 ohm, minimum, balanced between pins 2 & 3
Rated frequency range3 Hz to 40 kHz, +1/-3 dB; also [4, 40000], ±1 dB, 2005 manual
Poweringphantom 24-48 V. "24-48V Phantom, 10mA". The 2005 manual: "48V Phantom, 10mA".
Current draw10 mA
Weight225 g. "225g (.5lb)".
Dimensions22 × 229 mm. Diameter × length: "229 x 22 mm (9 x .860 in.)".
Supplied accessoriesmicrophone clip; calibration chart. "Your purchase includes".p. 2
From the manual (Recording Hacks copy)
Capsulepressure (omni), prepolarised condenserp. 2
Calibration chartEach microphone comes with its own chart of its individually measured frequency response
Proximity effectNone ("It exhibits no proximity effect")
Removable partsNone; the microphone cannot be opened
Applications (Earthworks, 2005)Quieter sources: vocals, strings, woodwinds, distant-miked orchestras or choirs; a matched pair for classical location recording
From the product page
Sensitivity−29 dBV/Pa (34 mV/Pa), typical; also −30.5 dBV/Pa, 30 mV/Pa, 2005 manual (converted). "34mV/Pa (-29dBV/Pa)" (20·log10(0.034) = -29.4). The 2005 manual says 30 mV/Pa (typical).p. 1
ConnectorXLR-3 male (pin 2 +). "XLR (pin 2+)"; the user guide says "XLR-3".

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

Recommended for

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

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