SR40/HC
Pin 1
“Shield”
Pin 2
“+”
Pin 3
“-”
Description
Earthworks SR40/HC is a directional pre-polarized con-
denser microphone with a rst-order hypercardioid pick-
up pattern directly coupled to a dedicated wideband,
low output impedance transformerless preamplier. The
SR40/HC requires a standard 24-48V Phantom Power
supply. It features a at frequency response from 100Hz
to 40kHz, fast impulse response, very low handling
noise, uniform polar pattern, and high SPL handling.
The SR40/HC provides excellent uncolored rejection of
sounds arriving off-axis.
Each SR40/HC microphone is delivered with its own
calibration chart providing its individually measured fre-
quency response curve. A mounting clip is included with
the microphone.
Applications
Earthworks SR40/HC is easy to operate. Connect the
microphone to a microphone preamplier 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 rst applied to
the microphone.
The excellent performance characteristics of the
SR40/HC allow it to be utilized for a very wide range of
applications. In the studio or on stage the SR40/HC is
an ideal choice for a variety of instruments including
sax, ute, trumpet, guitar, piano, and percussion. It is
superior for vocals or choir because it doesn’t spotlight;
rather, it uniformly picks up an entire section. The SR40/
HC is popular among concert tapers because of its open
uncolored sound and among jazz enthusiasts for its abil-
ity to capture explosive performances while retaining the
subtle nuances of artistic expression.
This microphone has no removable parts.
Care of Microphone
The Earthworks SR40/HC microphone is a precision in-
strument designed and built to provide years of top per-
formance. Follow these simple rules to help to protect
your investment in the SR40/HC:
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/HC in its case.
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XLR Output Connector Assignment of SR40/HC
Specications
Frequency response: 100Hz to 40kHz
Polar Pattern: Hypercardioid
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/HC (typical)
Polar Response of SR40/HC (typical)
Frequency Response of SR40/HC (typical)
Specications are subject to change without notice.
