Earthworks SR40 Datasheet

SR40 & SR40/HC

40kHz Cardioid & Hypercardioid High Definition Microphones™

Architectural & Engineering

Specications

40kHz Cardioid or Hypercardioid

The microphone shall be a back-electret con­denser type with a wide-range uniform frequency
response of 100 Hz to 40 kHz. The microphone
shall have an output level of 10 mV/Pa. The mi­crophone shall be of a single capsule, single
membrane design. The microphone shall have
an impulse response with the rise time no longer
than 25 microseconds, and total settling time, in­cluding the rise time, no longer than 120 micro­seconds. The microphone shall have polar charac­teristics uniform in all planes to form a cardioid or
hypercardioid of revolution. The microphone shall
accept sound pressure levels up to 139 dB pro­ducing no more than 3% THD. Dimensions shall
be 9.84 in. (250mm) long by .860 in. (22mm) in
diameter. The maximum head diameter shall be
.484 in. (12.3mm) without the windscreen, and

1.95 in. (49.6mm) with the windscreen. The mi­crophone shall be terminated with a male XLR-3
connector. The microphone shall require 24-48V
phantom power at 10mA. The microphone shall be
made of metal with a black nish. The Earthworks
SR40 or SR40/HC is specied.

• High Denition Microphone™

• 150Hz to 40kHz Frequency Response

• Hear Detail That Other Microphones Miss

• Uniform Frequency Response at 0°, 45°& 90°

• 139dB SPL Max Acoustic Input

• More Gain Before Feedback

• Exceptional Rejection of Sounds From the
Rear of the Microphone

A Technological Achievement

Earthworks’ advanced microphone technologies
have made it possible to create a cardioid and hyper­cardioid microphone with a 40kHz high frequency
response. This provides these microphones with ex­ceptional high frequency response that will capture
minute details previously not possible with conven­tional cardioid family microphones. The SR40 also
has exceptional impulse response which allows it
to capture fast transients quickly and accurately. Its
short diaphragm settling time will allow you to hear
subtle details that conventional microphones miss.
The Earthworks QTC40 is our most popular 40kHz
omni model and the SR40 models provides a car­dioid counterparts that are equally as exceptional.
With one listen, you will understand why we are so
excited about this exceptional new 40kHz cardioid
series microphones.

About High Denition Microphones™

During the last decade it has become commonplace for
sound recording and broadcast equipment to accom­modate extended frequency responses up to 100kHz.
With few exceptions, even the very best of conventional
professional microphones do not offer frequency re­sponses above 20kHz. However, making a High Deni­tion Microphone involves far more than extending the
frequency response. Impulse response, diaphragm
settling time and pristine electronics are also key ele­ments. Earthworks’ founder David Blackmer foresaw
the need for higher quality microphones, and Earth­works has been offering High Denition microphones,
with extended frequency response beyond 40kHz,
since 1996. Earthworks High Denition Microphones™
have an extremely clean, natural on-axis pickup, and
smooth, uncolored off-axis response with high front­to-back rejection that makes them superb for a wide
range of applications including sound reinforcement,
broadcast, in addition to recording voice and musical
instruments. You will hear exceptional sound quality
that is extremely accurate, detailed, open and crystal
clear even on analog or digital sound systems that are
limited to a 15kHz or 20kHz bandwidth. You will notice
a remarkable improvement in sound quality on nearly
all audio systems when using Earthworks High Deni­tion Microphones™.

Polar Patterns

David Blackmer also invented a totally new polar
technology that provides microphones with near-per­fect polar response. When you look at a polar pattern
of an Earthworks microphone, the mid frequencies,
high frequencies and low frequencies all look very
much like a “textbook perfect” polar pattern. In prac­tice this means the polar response of an Earthworks
microphone is extremely uniform over its operating
frequency range; the frequency response at 90 de­grees off-axis is very close to its on-axis response.
Such uniform polar response results in less phase
problems on the sides of the microphone and there
are fewer phase cancellations when using multiple
mics placed close together. This new polar technolo­gy also provides more rejection of unwanted sounds
from the rear of the microphone providing more gain
before feedback in live sound applications.

Impulse Response

Specications

Frequency Response:

Polar Pattern:

Sensitivity:

Power requirements:

Max Acoustic Input:

Output:

Output Impedance:

Min Output Load:

Noise:

Dimensions L x D:

Weight:

SR40 Polar
Response

SR40/HC

Polar
Response

100Hz to 40kHz
Cardioid or Hypercardioid
20mV/Pa (-34dBV/Pa)
24-48V Phantom, 10mA
139dB SPL
Male XLR-3 (PIN 2+)
65 Ω, balanced
(between pins 2 & 3)
600 ohms between pins 2 & 3
16dB SPL equivalent
(A weighted)

9.84 x 0.860 in. (250 x 22 mm)

0.5 lbs. (225g)

Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • Phone: [phone], ext 114 • email: [e-mail] • earthworksaudio.com