Description
Earthworks SR40 is a directional prepolar-
ized condenser microphone with a first-order
cardioid pickup pattern directly coupled to a
dedicated wideband, low output impedance
transformerless preamplifier. The SR40 re-
quires a standard 48V Phantom Power supply.
It features a flat frequency response from 30Hz
to 40kHz (Fig. 2), fast impulse response (Fig.
3), very low handling noise, uniform polar
pattern (Fig. 4), and high SPL handling. The
SR40 provides excellent uncolored rejection
of sounds arriving off-axis.
Each SR40 microphone is delivered with its
own calibration chart providing its individually
measured frequency response curve. A mount-
ing clip is included with the microphone.
The SR40 is protected by US Patent No.
6,091,829.
Applications
Earthworks SR40 is easy to operate. Connect
the microphone to a microphone preamplifier
supplying 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 al-
ready 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 head-
phones 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 applications. In the studio or on the
stage the SR40 is an ideal choice for a vari-
ety of instruments including sax, flute, trum-
pet, 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 is popular among concert tapers be-
cause of its open uncolored sound and among
jazz enthusiasts for its ability to capture explosive
performances while retaining the subtle nuances
of artistic expression. This microphone has no
removable parts.
Care of Microphones
The Earthworks SR40 microphone is a preci-
sion instrument designed and built to provide
years of excellent performance. Following these
simple rules will 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 to room tem-
perature when bringing it inside from the cold
weather. Rough handling may also damage the
microphone even if no visible marks are left.
• When not in use keep the SR40 in its case.
Specifications
Frequency response: 30Hz to 40kHz ±1.5dB
at 6 inches (15cm)
Polar Pattern: Cardioid (Fig. 4)
Sensitivity: 10mV/Pa (-40dBV/Pa)
Power Requirements: 48V Phantom, 10mA
Peak Acoustic Input: 145dB SPL
Output: XLR (Fig. 1)
Output Impedance: 100Ω, balanced
(50Ω ea. pin 2 & 3)
Minimum Load: 600Ω btw. pins 2 & 3
Noise: 22dBA equivalent
Dimensions L x D: 9 x .860 in.
(229 x 22 mm)
Weight: .5lb (225g)
Compliant
Fig. 1. XLR Output Connector Assignment of SR40
Fig. 2. Frequency Response (Typical) of S40
Fig. 3. Impulse Response (Typical) of SR40
Fig. 4. Polar Response (Typical) of SR40
Specifications are subject to change without notice.
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