Description
Earthworks SR77 is a directional prepolari-
zed condenser microphone with a first-order
cardioid pickup pattern directly coupled to a
dedicated wideband, low output impedance
transformerless preamplifier. The SR77 requires
a standard 48V Phantom Power supply. It
features a flat frequency response from 30Hz to
30kHz (Fig. 2), fast impulse response (Fig. 3),
very low handling noise, uniform polar pattern,
and high SPL handling capabilities. It provides
excellent uncolored rejection of sounds arriving
off-axis.
Each microphone is delivered with its own
calibration chart providing the individually
measured frequency response curve. A
mounting clip is included with the microphone.
The SR77 is protected by US Patent No.
6,091,829.
Applications
Earthworks SR77 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 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 “pop” when plugged in or powered up.
Make sure to mute the signal to speakers or
headphones when phantom power is first
applied.
The excellent performance characteristics of
the SR77 give it a very wide range of application
possibilities. In the studio or on the stage the
SR77 is an ideal choice for a variety of
instruments including sax, flute, trumpet, guitar,
piano, and percussion. It is superior for choir
because it doesn’t spotlight; rather, it picks up
an entire section with no hot spots. The SR77 is
popular among concert tapers because 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
Earthworks SR77 microphone is a precision
instrument designed and built to provide years
of top performance. Following these simple
rules will help to protect your investment in the
SR77:
•
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 SR77 in its case.
Specifications
Frequency response:
30Hz to 30kHz ±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:
100
Ω
, balanced
(50
Ω
ea. pin 2 & 3)
Minimum Load:
600
Ω
btw. pins 2 & 3
Noise:
22dBA
equivalent
Dimensions L x D
229 x 22 mm
(9
x
.860
in.)
Weight:
225g
(.5lb)
Compliant
Fig. 1. XLR Output Connector Assignment of SR77
Fig. 2. Frequency Response (Typical) of SR77
Fig. 3. Impulse Response (Typical) of SR77
Fig. 4. Polar Response (Typical) of SR77
Specifications are subject to change without
notice.
