SR40
Pin 1
“Shield”
Pin 2
“+”
Pin 3
“
-
”
Description
The Earthworks SR40 is a directional pre-polarized con-
denser microphone with a first-order cardioid pickup pat
-
tern directly coupled to a dedicated wideband, low out-
put impedance transformerless preamplifier. The SR40
requires a standard 24-48V Phantom Power supply. It
features a flat frequency response from 30Hz to 40kHz,
fast impulse response, very low handling noise, uniform
polar pattern, and high SPL handling. The SR40 provides
excellent uncolored rejection of sounds arriving off-axis.
Each SR40 microphone is delivered with its own calibra-
tion chart providing its individually measured frequency
response curve. A mounting clip is included with the mi-
crophone.
Applications
The Earthworks SR40 is easy to operate. Connect the
microphone to a microphone preamplifier supplying 24-
48V phantom power using a standard XLR microphone
cable. Please allow up to one minute for the microphone
to settle. Plugging in the microphone “hot” (phantom
power already present at the input) will not damage the
microphone, and is actually preferred for faster settling.
It is normal for any phantom powered mic to cause a
“pop” in the audio or recording system when plugged in
or powered up. Make sure to mute the signal to speakers
or headphones when phantom power is first applied to
the microphone.
The excellent performance characteristics of the SR40
allow it to be utilized for a very wide range of applica-
tions. In the studio or on stage the SR40 is an ideal
choice for a variety of instruments including sax, flute,
trumpet, guitar, piano, and percussion. It is superior for
vocals or choir because it doesn’t spotlight; rather, it uni-
formly picks up an entire section. The SR40 is popular
among concert tapers because of its open uncolored
sound and among jazz enthusiasts for its ability to cap-
ture explosive performances while retaining the subtle
nuances of artistic expression.
This microphone has no removable parts.
Care of Microphone
The Earthworks SR40 microphone is a precision instru-
ment designed and built to provide years of top perfor-
mance. Follow these simple rules to help to protect your
investment in the SR40:
Avoid touching the front protective screen.
Never attempt to disassemble the microphone –
it cannot be opened.
Avoid extreme heat and condensing humidity.
Allow the microphone to warm up in the case when
bringing it in from the cold weather.
Rough handling may damage the microphone even
if no visible marks are left.
When not in use keep the SR40 in its case.
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XLR Output Connector Assignment of SR40
Specifications
Frequency response: 100Hz to 40kHz
Polar Pattern: Cardioid
Sensitivity: 20mV/Pa (-34dBV/Pa)
Power Requirements: 24-48V Phantom, 10mA
Peak Acoustic Input: 139dB SPL
Output: XLR-3
Output Impedance: 65Ω, balanced between pins 2 & 3
Minimum Load: 600Ω btw. pins 2 & 3
Noise: 16dB, A equivalent
Dimensions L x D: 229 x 22 mm (9 x .860 in.)
Weight: 225g (.5lb)
Impulse Response of SR40 (typical)
Polar Response of SR40 (typical)
Frequency Response of SR40 (typical)
Specifications are subject to change without notice.
